Re: with ignored
However, ignored() is actually implemented as a generator function with the @contextmanager decorator shortcut. This decorator takes a generator function and wraps it up as a class with the necessary __enter__ and __exit__ methods. The __enter__ method in this case calls the .next() method of the generator and returns after it yields once. I looked up the source to the decorator found here:http://hg.python.org/cpython/file/406b47c64480/Lib/contextlib.py for anyone interested. It appears that they are using yield so that they can call it again and force it to throw the stop iteration exception. The __exit__ method calls it again -- or it calls the .throw() method if an exception was passed in -- and expects the generator to exit as a result. And here to go with what I said above, they want to be able to use the generators throw ability to capture any exception and throw it to the generator, but then why do they *need* the generator to not iterate again? Or in other words, why when they create the context manager via _GeneratorContextManager on line 33, is there the clause in __exit__ to have stop iteration happen or else throw a runtime error? I am thinking this is because it needs the yield to be over so that it can return the control flow to normal, and that subroutine will be done. But I am new to the whole subroutine paradigm so I could be misunderstanding this. Also, if the value was none, why are they instantiating a new exception with value = type()? How could there be a type for the exception without the exception? (From what I understand type is the error type, and value is the error object). So from the perspective of the generator it does its context setup (in this case, setting up a try block) prior to the yield, and then does the cleanup (in this case, selectively catching and suppressing the exceptions) after the yield. This part makes sense logically. And I like the simplicity. Now I just need to make sure I understand how the yield semantics are allowing this construct to work. Thanks for the reply Ian! -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Formatting lost in hg-web (was Re: with ignored)
On Mon, Apr 8, 2013 at 4:38 PM, Barrett Lewis musikal.fus...@gmail.com wrote: I looked up the source to the decorator found here:http://hg.python.org/cpython/file/406b47c64480/Lib/contextlib.py for anyone interested. Strangely, line indentation seems to be swallowed in the web view of the Mercurial tree. The code directly follows the line numbers, so it goes ragged between (eg) lines 9 and 10. Is this a browser bug? I tried on Chrome 26.0.1410.40 and Firefox 19.0.2 on Windows. ChrisA -- http://mail.python.org/mailman/listinfo/python-list
Re: Formatting lost in hg-web (was Re: with ignored)
I am viewing it on Chrome Version 26.0.1410.43 m for windows and it works perfectly for me. On Mon, Apr 8, 2013 at 12:32 AM, Chris Angelico ros...@gmail.com wrote: On Mon, Apr 8, 2013 at 4:38 PM, Barrett Lewis musikal.fus...@gmail.com wrote: I looked up the source to the decorator found here: http://hg.python.org/cpython/file/406b47c64480/Lib/contextlib.py for anyone interested. Strangely, line indentation seems to be swallowed in the web view of the Mercurial tree. The code directly follows the line numbers, so it goes ragged between (eg) lines 9 and 10. Is this a browser bug? I tried on Chrome 26.0.1410.40 and Firefox 19.0.2 on Windows. ChrisA -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Formatting lost in hg-web (was Re: with ignored)
On Mon, Apr 8, 2013 at 5:36 PM, Barrett Lewis musikal.fus...@gmail.com wrote: I am viewing it on Chrome Version 26.0.1410.43 m for windows and it works perfectly for me. Huh. Extremely weird. Ctrl-F5 fixed it, and now the source looks different. Either someone's *right now* editing stuff (in which case I'll shut up and let him/her do so), or there's something insanely weird in my system. Which is possible... Windows XP, second-last bastion of real Windows in my control... ChrisA -- http://mail.python.org/mailman/listinfo/python-list
How to do a Lispy-esque read?
Suppose I want to read an object from some stream. How do I do it? For example, if the input stream contained the text: [1, # python should ignore this comment 2] and I do a read on it, I should obtain the result [1, 2] -- http://mail.python.org/mailman/listinfo/python-list
Re: How to do a Lispy-esque read?
For example, if the input stream contained the text:
[1, # python should ignore this comment
2]
and I do a read on it, I should obtain the result
[1, 2]
--
I don't know much about lisp but given that input and the desired output
you can write functions like the following
def strtolist(l):
if l.startswith('['):
l = l[1:]
if l.endswith(']'):
l = l[:-1]
# treat newlines as if they are commas so we can easily split
l = l.replace('\n', ',').split(',')
# list comprehension
# strip to remove whitespace and aggregate all elements without the
comment
# you can further refine this to create ints by using the int() method
return [x for x in l if not x.strip().startswith('#')]
you would have to use input() to read the input or open a file. Either way
you can pass that value to strtolist and it will convert it to a list of
strings.
However, this implementation is not very robust and doesn't cover a lot of
edge cases (more a demo of how it might be done, I don't know your python
experience so forgive me if this is all self evident).
The real solution that I would use would be to use the json module.
Docs: http://docs.python.org/3.3/library/json.html
It allows you to take a string and turn it into a native dict or list in
python. The great part is that it is fairly robust and it has a simple
interface. You could take input() and send it to loads and it will return
an array. The downside is json doesn't allow comments.
If you really want comments, you could look into some of the yaml
libraries, a quick google search shoes PyYaml is out there. I however don't
have any knowledge of that module or other yaml modules as I find json is
enough for anything I've ever attempted.
I hope that helps
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Interactive development in Python à la Smalltalk?
Hello, I'm absolutely new to Python, just looked at the language description for the first time. The first thought that came to my mind was whether you can program in Python in an interactive programming style, i.e. I can change code in the debugger which becomes immediately effective (no edit-compile loop) and I can also send messages to objects visible inside the debugger. Then Python could become my replacemenet for my dearly missed Smalltalk, which to my great grief meanwhile really has become quite dead, I fear. In Smalltalk you can open up an inspector window (e.g. you don't have to get into debug mode), inspect objects in it and evaluate code in it, send messaages to objects. I guess this cannot be done in Python out of the box. But if changes made in the debugger became immediately effective, this would be interactive enough for my purposes. Thanks, Bienlein -- http://mail.python.org/mailman/listinfo/python-list
Re: How to do a Lispy-esque read?
There is no read in a stream until it's a valid literal function as far as I know, but ast.literal_eval will turn your string into an object. On Mon, Apr 8, 2013 at 12:45 AM, zeta.con...@gmail.com wrote: Suppose I want to read an object from some stream. How do I do it? For example, if the input stream contained the text: [1, # python should ignore this comment 2] and I do a read on it, I should obtain the result [1, 2] -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: mock django cache
- Original Message -
In my settings.py , I have specified my cache as :
CACHES = {
'default': {
..
}
}
In my views.py, I have
import requests
from django.core.cache import cache, get_cache
def aview():
#check cache
if not get_cache('default').get('key'):
#make request and save in cache
result = request.get('some_url')
get_cache('default').set('key', result)
return result
else:
return get_cache('default').get('key')
Now in my tests.py, I have been able to mock requests.get('aurl'), so
that makes sure that no external requests are made.
But the test code still hits the cache and gets/sets from it. So if
my prod has already set the cache, then test is failing because it
gets the data from same cache. Or if I run my tests first, then the
test case is setting the cache with test data and I see that same
reflected when I run prod website.
How can I mock the calls to get_cache('default').set('key', result)
and get_cache('default').get('key') so that the set call does not
sets the real cache ( return None?) and get does not return anything
in actual cache.
Please provide me with code sample to how to get this done.
Here is how I have mocked my requests.get
def test_get_aview(self):
with mock.patch('requests.get') as mymock:
mymock.side_effect = (lambda url: MOCKED_DATA[url])
What code can I put after this to make it work? I tried something
like
class MockCacheValue(mock.MagicMock):
def get(self, key):
print 'here'
return None
def set(self, key, value):
print 'here 2'
pass
def test_get_aview(self):
with mock.patch('requests.get') as mymock:
mymock.side_effect = (lambda url: MOCKED_DATA[url])
mock.patch('django.core.cache.get_cache',
new=MockCacheValue)
but it does not work and putting a print statement inside get/set
above does not print anything giving me an idea that its not mocked
properly
Having a quick look at django doc, get_cache() returns a cache which has get
set methods, so you need get_cache to return a Mock object that mock the get
and set method.
Try something like :
mock.patch('django.core.cache.get_cache',Mock(return_value=MockCacheValue())
JM
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help needed
hello all, i have typed the following program from the book learn python the hard way: from sys import argv script, first, second, third = argv print The script is called:, script print Your first variable is:, first print Your second variable is:, second print Your third variable is:, third then i get this error: Traceback (most recent call last): File /Users/leonardo/Documents/ex13.py, line 3, in module script, first, second, third = argv ValueError: need more than 1 value to unpack in the book the author says that i should run the program like this: $ python ex13.py first 2nd 3rd The script is called: ex13.py Your first variable is: first Your second variable is: 2nd Your third variable is: 3rd but how can i do that?? what are the steps? where should i go? thanks! best regards leonardo-- http://mail.python.org/mailman/listinfo/python-list
Re: help needed
Do you happen to be on windows? Because if you are then you need to edit the registry. If you are on windows let me know and I will walk you through the fix, but if not then it would be a waste of time for me to explain it. -- http://mail.python.org/mailman/listinfo/python-list
Re: help needed
On Mon, Apr 8, 2013 at 11:01 AM, leonardo selmi l.se...@icloud.com wrote: then i get this error: Traceback (most recent call last): File /Users/leonardo/Documents/ex13.py, line 3, in module script, first, second, third = argv ValueError: need more than 1 value to unpack You didn't provide any arguments to the script. in the book the author says that i should run the program like this: $ python ex13.py first 2nd 3rdThe script is called: ex13.pyYour first variable is: firstYour second variable is: 2ndYour third variable is: 3rd but how can i do that?? what are the steps? where should i go? You need to open a command line terminal and type the first line (without the dollar sign). You will need to change your directory to the directory that contains your exercise script, probably by doing cd /path/to/exercise/directory. If you're on Windows it's the same idea, you run the cmd program, but you would have to specify the full path to the python interpreter instead of just python, or follow the directions that have been offered for fixing Windows. Adam www.mesha.org -- http://mail.python.org/mailman/listinfo/python-list
Re: Interactive development in Python à la Smalltalk?
On Mon, 08 Apr 2013 01:33:13 -0700, Bienlein wrote: Hello, I'm absolutely new to Python, just looked at the language description for the first time. The first thought that came to my mind was whether you can program in Python in an interactive programming style, i.e. I can change code in the debugger which becomes immediately effective (no edit-compile loop) and I can also send messages to objects visible inside the debugger. Out of the box, Python comes with an extremely powerful interactive environment. Just launch Python from the command prompt with no arguments, and it will open an interactive interpreter that allows you to enter commands, hit enter, and have them executed. I strongly recommend you work through at least the beginning of the tutorial, and get used to the interactive interpreter. Here's the one for Python 2: http://docs.python.org/2/tutorial/index.html and version 3: http://docs.python.org/3/tutorial/index.html If that's not enough for you, there are third-party Python interpreters that do much more, such as BPython, IPython and DreamPie. http://bpython-interpreter.org/screenshots/ http://ipython.org/index.html http://www.dreampie.org/. IPython will be especially familiar to those used to Mathematica. You can't quite edit code in live objects -- code is compiled to byte- code for a virtual machine, and you cannot edit that -- but you can easily redefine objects, including functions and methods, on the fly. py class Test(object): ... def method(self, arg): ... print argument received:, arg ... py py t = Test() py t.method(23) argument received: 23 py py def method(self, arg): ... print argument received:, arg+1000 ... py Test.method = method py t.method(23) argument received: 1023 -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: help needed
thanks barrett, but i am using a mac.. Il 08/04/2013 11.15, Barrett Lewis ha scritto: Do you happen to be on windows? Because if you are then you need to edit the registry. If you are on windows let me know and I will walk you through the fix, but if not then it would be a waste of time for me to explain it. -- http://mail.python.org/mailman/listinfo/python-list
How to subclass a family
Here is the idea. I have a number of classes with the same interface. Something like the following: class Foo1: def bar(self, ...): work def boo(self, ...): do something self.bar(...) What I want is the equivallent of: class Far1(Foo1): def boo(self, ...) do something different if whatever: self.bar(...) else: Foo1.boo(self, ...) Now of course I could subclass every class from the original family from Foo1 to Foon but that would mean a lot of duplicated code. Is there a way to reduce the use of duplicated code in such circumstances? -- Antoon Pardon -- http://mail.python.org/mailman/listinfo/python-list
Re: help needed
On Mon, Apr 8, 2013 at 7:29 PM, leonardo tampucciol...@libero.it wrote: thanks barrett, but i am using a mac.. Open up Terminal - that'll give you a window with a bash prompt. Proceed from there; it's the same as the default shell on many Linuxes. ChrisA -- http://mail.python.org/mailman/listinfo/python-list
Can anyone please help me in resolving the error = AttributeError: Array instance has no attribute '__trunc__'
I am trying to create 2D arrays without using advanced features like numpy, for this I have created 2 separate modules arrays.py and array2D.py. Here's the code for that: arrays.py module: == import ctypes class Array: #Creates an array with size elements. def __init__( self, size ): assert size 0, Array size must be 0 self._size = size print sixe is %s %self._size # Create the array structure using the ctypes module. PyArrayType = ctypes.c_int * size self._elements = PyArrayType() print type is e, type(self._elements) #self._elements = ctypes.c_int * size print Elements are self.element %s % self._elements # Initialize each element. #for i in range(self._size): # self.clear( i ) # Returns the size of the array. def __len__( self ): return self._size # Gets the contents of the index element. def __getitem__( self, index ): assert index = 0 and index len(self), Array subscript out of range return self._elements[ index ] # Puts the value in the array element at index position. def __setitem__( self, index, value ): assert index = 0 and index len(self), Array subscript out of range print Type is , type(index) self._elements[ index ] = value # Clears the array by setting each element to the given value. def clear( self, value ): for i in range( len(self) ) : self._elements[i] = value # Printing the arrays: def __str__(self): return self._elements array2D.py module == import arrays class Array2D : # Creates a 2-D array of size numRows x numCols. def __init__( self, numRows, numCols ): # Create a 1-D array to store an array reference for each row. self._theRows = arrays.Array( numRows ) # Create the 1-D arrays for each row of the 2-D array. print Num of Cloumns is, numCols for i in range( numRows ) : self._theRows[i] = arrays.Array( numCols ) # Returns the number of rows in the 2-D array. def numRows( self ): return len( self._theRows ) # Returns the number of columns in the 2-D array. def numCols( self ): return len( self._theRows[0] ) # Clears the array by setting every element to the given value. def clear( self, value ): for row in range( self.numRows() ): row.clear( value ) # Gets the contents of the element at position [i, j] def __getitem__( self, ndxTuple ): assert len(ndxTuple) == 2, Invalid number of array subscripts. row = ndxTuple[0] col = ndxTuple[1] assert row = 0 and row self.numRows() \ and col = 0 and col self.numCols(), \ Array subscript out of range. the1dArray = self._theRows[row] return the1dArray[col] # Sets the contents of the element at position [i,j] to value. def __setitem__( self, ndxTuple, value ): #assert len(ndxTuple) == 3, Invalid number of array subscripts. row = ndxTuple[0] col = ndxTuple[1] assert row = 0 and row self.numRows() \ and col = 0 and col self.numCols(), \ Array subscript out of range. the1dArray = self._theRows[row] the1dArray[col] = value arr = Array2D(2,4) print arr is %s %arr Traceback is : sixe is 2 type is e class 'arrays.c_long_Array_2' Elements are self.element arrays.c_long_Array_2 object at 0x00AA7F80 Cols in 4 Num of Cloumns is 4 !! i is 0 sixe is 4 type is e class 'arrays.c_long_Array_4' Elements are self.element arrays.c_long_Array_4 object at 0x00B60210 Type is type 'int' Traceback (most recent call last): File C:\Python27\Lib\array2D.py, line 53, in module arr = Array2D(2,4) File C:\Python27\Lib\array2D.py, line 16, in __init__ self._theRows[i] = arrays.Array( numCols ) File C:\Python27\Lib\arrays.py, line 36, in __setitem__ self._elements[ index ] = value AttributeError: Array instance has no attribute '__trunc__' -- http://mail.python.org/mailman/listinfo/python-list
Displaying colours in saved script
Hi all, I'm new to Python and have a pretty basic question, explained in the following screendump: http://i.imgur.com/oaCuKp5.jpg After I save my script, the nice colours that make the code easier to read disappear. How do I stop that from happening? Any help much appreciated. -- http://mail.python.org/mailman/listinfo/python-list
Re: im.py: a python communications tool
On Apr 7, 6:36 pm, Steven D'Aprano steve +comp.lang.pyt...@pearwood.info wrote: On Sun, 07 Apr 2013 14:47:11 -0700, jhunter.dunefsky wrote: Actually, my current licence can be found here: https://github.com/jhunter-d/im.py/blob/master/LICENCE. Whaddaya think about this, Useneters? I think you're looking for a world of pain, when somebody uses your software, it breaks something, and they sue you. Your licence currently means that you are responsible for the performance of your software. Why don't you use a recognised, tested, legally-correct licence, like the MIT licence, instead of trying to be clever and/or lazy with a one-liner? E.g.http://opensource.org/licenses/MIT Software licencing is a solved problem. Do you really think that people write three or four paragraph licences because they *like* legal boilerplate? Did you imagine that you were the first person to think, I know! I'll write a one-liner telling people they can do whatever they want with my software! Nothing can possibly go wrong!? Use a known, tested, working solution, and save yourself the pain. -- Steven MIT is actually the best one I've seen so far. I'm updating LICENCE. -- http://mail.python.org/mailman/listinfo/python-list
Re: Displaying colours in saved script
On 04/08/2013 06:32 AM, Casperb wrote: Hi all, I'm new to Python and have a pretty basic question, explained in the following screendump: http://i.imgur.com/oaCuKp5.jpg After I save my script, the nice colours that make the code easier to read disappear. How do I stop that from happening? Any help much appreciated. Python source code is a plain text file, which has no colors. The colors are used by your Python Shell only for displaying to the screen. When Python Shell reloads Python source, it presumably reparses the text and shows it with colors. My guess is that by naming the file without a .py extension, you convinced Python Shell that it was NOT source code, and therefore shouldn't be colorized. -- DaveA -- http://mail.python.org/mailman/listinfo/python-list
subprocess question re waiting
I want to call a child process to run a shell script and wait for that script to finish. Will the code below wait for the script to finish? If not then how do I make it wait? Any help appreciated. import subprocess command = /home/john/myscript process = subprocess.Popen(command, stdin=subprocess.PIPE,stdout=subprocess.PIPE, stderr=subprocess.PIPE, close_fds=True, shell=True) out, err = process.communicate() returncode = process.returncode -- http://mail.python.org/mailman/listinfo/python-list
Re: help needed
thanks adam, but it is not clear to me yet. if i open the terminal how do i work on it? what should i type in? thanks Il giorno 08/apr/2013, alle ore 11:25, Adam Mesha a...@mesha.org ha scritto: On Mon, Apr 8, 2013 at 11:01 AM, leonardo selmi l.se...@icloud.com wrote: then i get this error: Traceback (most recent call last): File /Users/leonardo/Documents/ex13.py, line 3, in module script, first, second, third = argv ValueError: need more than 1 value to unpack You didn't provide any arguments to the script. in the book the author says that i should run the program like this: $ python ex13.py first 2nd 3rd The script is called: ex13.py Your first variable is: first Your second variable is: 2nd Your third variable is: 3rd but how can i do that?? what are the steps? where should i go? You need to open a command line terminal and type the first line (without the dollar sign). You will need to change your directory to the directory that contains your exercise script, probably by doing cd /path/to/exercise/directory. If you're on Windows it's the same idea, you run the cmd program, but you would have to specify the full path to the python interpreter instead of just python, or follow the directions that have been offered for fixing Windows. Adam www.mesha.org -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: help needed
On 04/08/2013 07:24 AM, leonardo wrote: thanks adam, but it is not clear to me yet. if i open the terminal how do i work on it? what should i type in? Please don't top-post. It kills off the context. Go back to the previous message and you'll see Adam tells you exactly what to type at the terminal. But to be more literal: python ex13.py first 2nd 3rd -- DaveA -- http://mail.python.org/mailman/listinfo/python-list
Re: subprocess question re waiting
loial jldunn2...@gmail.com writes: I want to call a child process to run a shell script and wait for that script to finish. Will the code below wait for the script to finish? If not then how do I make it wait? [...] process = subprocess.Popen(command, stdin=subprocess.PIPE,stdout=subprocess.PIPE, stderr=subprocess.PIPE, close_fds=True, shell=True) process.wait() -- Alain. -- http://mail.python.org/mailman/listinfo/python-list
Re: help needed
On Apr 8, 4:41 pm, Dave Angel da...@davea.name wrote: Go back to the previous message and you'll see Adam tells you exactly what to type at the terminal. But to be more literal: python ex13.py first 2nd 3rd followed by RET (also called ENTER) key -- http://mail.python.org/mailman/listinfo/python-list
Re: subprocess question re waiting
On Mon, Apr 8, 2013 at 9:48 PM, Alain Ketterlin al...@dpt-info.u-strasbg.fr wrote: loial jldunn2...@gmail.com writes: I want to call a child process to run a shell script and wait for that script to finish. Will the code below wait for the script to finish? If not then how do I make it wait? [...] process = subprocess.Popen(command, stdin=subprocess.PIPE,stdout=subprocess.PIPE, stderr=subprocess.PIPE, close_fds=True, shell=True) process.wait() Or use subprocess.call instead which does what you want. -- Alain. -- http://mail.python.org/mailman/listinfo/python-list -- The UNIX system has a command, nice ... in order to be nice to the other users. Nobody ever uses it. - Andrew S. Tanenbaum -- http://mail.python.org/mailman/listinfo/python-list
Re: subprocess question re waiting
On 04/08/2013 08:01 AM, Dylan Evans wrote: On Mon, Apr 8, 2013 at 9:48 PM, Alain Ketterlin al...@dpt-info.u-strasbg.fr wrote: loial jldunn2...@gmail.com writes: I want to call a child process to run a shell script and wait for that script to finish. Will the code below wait for the script to finish? If not then how do I make it wait? [...] process = subprocess.Popen(command, stdin=subprocess.PIPE,stdout=subprocess.PIPE, stderr=subprocess.PIPE, close_fds=True, shell=True) process.wait() Or use subprocess.call instead which does what you want. -- Alain. -- http://mail.python.org/mailman/listinfo/python-list http://docs.python.org/2/library/subprocess.html#popen-objects or use communicate(), which is what the OP had in the first place. -- DaveA -- http://mail.python.org/mailman/listinfo/python-list
Re: subprocess question re waiting
On 04/08/2013 07:00 AM, loial wrote: I want to call a child process to run a shell script and wait for that script to finish. Will the code below wait for the script to finish? If not then how do I make it wait? Any help appreciated. import subprocess command = /home/john/myscript process = subprocess.Popen(command, stdin=subprocess.PIPE,stdout=subprocess.PIPE, stderr=subprocess.PIPE, close_fds=True, shell=True) out, err = process.communicate() returncode = process.returncode Yes, communicate() will block until the child process is complete. http://docs.python.org/2/library/subprocess.html#popen-objects Note the phrase: Wait for process to terminate. That's referring to the shell in your case. -- DaveA -- http://mail.python.org/mailman/listinfo/python-list
Re: Interactive development in Python à la Smalltalk?
On 08/04/2013 4:33 AM, Bienlein wrote: Hello, I'm absolutely new to Python, just looked at the language description for the first time. The first thought that came to my mind was whether you can program in Python in an interactive programming style, i.e. I can change code in the debugger which becomes immediately effective (no edit-compile loop) and I can also send messages to objects visible inside the debugger. Then Python could become my replacemenet for my dearly missed Smalltalk, which to my great grief meanwhile really has become quite dead, I fear. In Smalltalk you can open up an inspector window (e.g. you don't have to get into debug mode), inspect objects in it and evaluate code in it, send messaages to objects. I guess this cannot be done in Python out of the box. But if changes made in the debugger became immediately effective, this would be interactive enough for my purposes. Thanks, Bienlein If you are using Windows, PyScripter is a good choice. I understand that, with Linux, it can also be used with Wine. I haven't tried that. Colin W. -- http://mail.python.org/mailman/listinfo/python-list
Re: Can anyone please help me in resolving the error = AttributeError: Array instance has no attribute '__trunc__'
On Mon, Apr 8, 2013 at 8:07 PM, bhk...@gmail.com wrote: I am trying to create 2D arrays without using advanced features like numpy, for this I have created 2 separate modules arrays.py and array2D.py. Here's the code for that: arrays.py module: == import ctypes class Array: #Creates an array with size elements. def __init__( self, size ): assert size 0, Array size must be 0 self._size = size print sixe is %s %self._size # Create the array structure using the ctypes module. PyArrayType = ctypes.c_int * size self._elements = PyArrayType() print type is e, type(self._elements) #self._elements = ctypes.c_int * size print Elements are self.element %s % self._elements # Initialize each element. #for i in range(self._size): # self.clear( i ) # Returns the size of the array. def __len__( self ): return self._size # Gets the contents of the index element. def __getitem__( self, index ): assert index = 0 and index len(self), Array subscript out of range return self._elements[ index ] # Puts the value in the array element at index position. def __setitem__( self, index, value ): assert index = 0 and index len(self), Array subscript out of range print Type is , type(index) self._elements[ index ] = value # Clears the array by setting each element to the given value. def clear( self, value ): for i in range( len(self) ) : self._elements[i] = value # Printing the arrays: def __str__(self): return self._elements array2D.py module == import arrays class Array2D : # Creates a 2-D array of size numRows x numCols. def __init__( self, numRows, numCols ): # Create a 1-D array to store an array reference for each row. self._theRows = arrays.Array( numRows ) # Create the 1-D arrays for each row of the 2-D array. print Num of Cloumns is, numCols for i in range( numRows ) : self._theRows[i] = arrays.Array( numCols ) # Returns the number of rows in the 2-D array. def numRows( self ): return len( self._theRows ) # Returns the number of columns in the 2-D array. def numCols( self ): return len( self._theRows[0] ) # Clears the array by setting every element to the given value. def clear( self, value ): for row in range( self.numRows() ): row.clear( value ) # Gets the contents of the element at position [i, j] def __getitem__( self, ndxTuple ): assert len(ndxTuple) == 2, Invalid number of array subscripts. row = ndxTuple[0] col = ndxTuple[1] assert row = 0 and row self.numRows() \ and col = 0 and col self.numCols(), \ Array subscript out of range. the1dArray = self._theRows[row] return the1dArray[col] # Sets the contents of the element at position [i,j] to value. def __setitem__( self, ndxTuple, value ): #assert len(ndxTuple) == 3, Invalid number of array subscripts. row = ndxTuple[0] col = ndxTuple[1] assert row = 0 and row self.numRows() \ and col = 0 and col self.numCols(), \ Array subscript out of range. the1dArray = self._theRows[row] the1dArray[col] = value arr = Array2D(2,4) print arr is %s %arr Traceback is : sixe is 2 type is e class 'arrays.c_long_Array_2' Elements are self.element arrays.c_long_Array_2 object at 0x00AA7F80 Cols in 4 Num of Cloumns is 4 !! i is 0 sixe is 4 type is e class 'arrays.c_long_Array_4' Elements are self.element arrays.c_long_Array_4 object at 0x00B60210 Type is type 'int' Traceback (most recent call last): File C:\Python27\Lib\array2D.py, line 53, in module arr = Array2D(2,4) File C:\Python27\Lib\array2D.py, line 16, in __init__ self._theRows[i] = arrays.Array( numCols ) File C:\Python27\Lib\arrays.py, line 36, in __setitem__ self._elements[ index ] = value AttributeError: Array instance has no attribute '__trunc__' -- http://mail.python.org/mailman/listinfo/python-list Not sure about the __trunc__ problem but i can suggest this alternative which is a bit simpler def array2D(x, y, val=None): return [[val for col in xrange(x)] for row in xrange(y)] -- The UNIX system has a command, nice ... in order to be nice to the other users. Nobody ever uses it. - Andrew S. Tanenbaum -- http://mail.python.org/mailman/listinfo/python-list
Re: subprocess question re waiting
On Mon, Apr 8, 2013 at 10:22 PM, Dave Angel da...@davea.name wrote: On 04/08/2013 08:01 AM, Dylan Evans wrote: On Mon, Apr 8, 2013 at 9:48 PM, Alain Ketterlin al...@dpt-info.u-strasbg.fr wrote: loial jldunn2...@gmail.com writes: I want to call a child process to run a shell script and wait for that script to finish. Will the code below wait for the script to finish? If not then how do I make it wait? [...] process = subprocess.Popen(command, stdin=subprocess.PIPE,stdout=**subprocess.PIPE, stderr=subprocess.PIPE, close_fds=True, shell=True) process.wait() Or use subprocess.call instead which does what you want. Actually after having a look through the manual i like check_output for this since it simplifies the code, but some extra exception handling would be required if the output is still required when the script exits with a non zero value, so it's a bit of a trade off. -- Alain. -- http://mail.python.org/**mailman/listinfo/python-listhttp://mail.python.org/mailman/listinfo/python-list http://docs.python.org/2/**library/subprocess.html#popen-**objectshttp://docs.python.org/2/library/subprocess.html#popen-objects or use communicate(), which is what the OP had in the first place. -- DaveA -- http://mail.python.org/**mailman/listinfo/python-listhttp://mail.python.org/mailman/listinfo/python-list -- The UNIX system has a command, nice ... in order to be nice to the other users. Nobody ever uses it. - Andrew S. Tanenbaum -- http://mail.python.org/mailman/listinfo/python-list
is _io.py missing from 2.7.4 ?
In 2.7.4, io.py shows: import _io import abc from _io import (DEFAULT_BUFFER_SIZE, BlockingIOError, UnsupportedOperation, open, FileIO, BytesIO, StringIO, BufferedReader, BufferedWriter, BufferedRWPair, BufferedRandom, IncrementalNewlineDecoder, TextIOWrapper) but, cannot find _io.py, though there is the old _pyio.py in the //Python27//Lib folder. -- http://mail.python.org/mailman/listinfo/python-list
Re: Splitting of string at an interval
In article mailman.263.1365390121.3114.python-l...@python.org, Chris Angelico ros...@gmail.com wrote: On Mon, Apr 8, 2013 at 7:48 AM, Steven D'Aprano steve+comp.lang.pyt...@pearwood.info wrote: Like every programming problem, the solution is to break it apart into small, simple steps that even a computer can follow. ... 5) Shortcut the whole thing, since the problem was underspecified, by using a literal. words = [The Sun, rises in, in the, east of, our earth] *dive for cover against rotten tomatoes* Seems like the right solution to me. For a while, I was rabidly(*) into TDD (Test Driven Development). The cycle I was using was, Write a specification of a behavior, write a (failing) test for that behavior, then write the least possible amount of code to make the test pass. Lather, Rinse, Repeat, Ship The least possible part is important. It makes sure the cycles stay short (ideally, just a few minutes), and that you don't write any code for which you don't have tests. If you buy into that plan, then I see nothing wrong with your suggested solution. (*) I still believe in TDD, but I don't practice it quite as enthusiastically as I used to. Which probably means my code isn't as good as it used to be. -- http://mail.python.org/mailman/listinfo/python-list
Re: is _io.py missing from 2.7.4 ?
On Mon, Apr 8, 2013 at 11:12 PM, dbv dineshbvad...@hotmail.com wrote: In 2.7.4, io.py shows: import _io import abc from _io import (DEFAULT_BUFFER_SIZE, BlockingIOError, UnsupportedOperation, open, FileIO, BytesIO, StringIO, BufferedReader, BufferedWriter, BufferedRWPair, BufferedRandom, IncrementalNewlineDecoder, TextIOWrapper) but, cannot find _io.py, though there is the old _pyio.py in the //Python27//Lib folder. _io.__file__ '/usr/lib/python2.7/lib-dynload/_io.so' Looks like it's implemented in C. -- http://mail.python.org/mailman/listinfo/python-list -- The UNIX system has a command, nice ... in order to be nice to the other users. Nobody ever uses it. - Andrew S. Tanenbaum -- http://mail.python.org/mailman/listinfo/python-list
Re: is _io.py missing from 2.7.4 ?
Ah, okay. Then on Windows, _io.pyd should be in the /DLLs folder but it isn't there ? -- http://mail.python.org/mailman/listinfo/python-list
Re: is _io.py missing from 2.7.4 ?
_io is a builtin module -- http://mail.python.org/mailman/listinfo/python-list
Re: The usage of -m option of python
In article mailman.3484.1363662214.2939.python-l...@python.org, Terry Reedy tjre...@udel.edu wrote: On 3/18/2013 5:17 PM, Peng Yu wrote: Hi, I don't quite understand how -m option is used. And it is difficult to search for -m in google. Could anybody provide me with an example on how to use this option? python -m test at a command line runs the regression tests in the test package python -m test -v test_difflib runs test.test_difflib in verbose mode. I get for both : /usr/bin/python: test is a package and cannot be directly executed. What gives? (Official stable Debian distribution. Python 2.7) -- Terry Jan Reedy Groetjes Albert -- Albert van der Horst, UTRECHT,THE NETHERLANDS Economic growth -- being exponential -- ultimately falters. albert@spearc.xs4all.nl =n http://home.hccnet.nl/a.w.m.van.der.horst -- http://mail.python.org/mailman/listinfo/python-list
Re: Splitting of string at an interval
On 8 April 2013 14:21, Roy Smith r...@panix.com wrote: For a while, I was rabidly(*) into TDD (Test Driven Development). The cycle I was using was, Write a specification of a behavior, write a (failing) test for that behavior, then write the least possible amount of code to make the test pass. Lather, Rinse, Repeat, Ship The least possible part is important. It makes sure the cycles stay short (ideally, just a few minutes), and that you don't write any code for which you don't have tests. The least amount of code is often also not the best in terms of time or space complexity. Does this mean you have to write tests for time and space complexity as well? That's interesting, but I don't know of tools to help do that (time complexity seems easy enough, but space complexity seems tougher to me). -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list
Re: is _io.py missing from 2.7.4 ?
Am 08.04.2013 15:42 schrieb dbv: Ah, okay. Then on Windows, _io.pyd should be in the /DLLs folder but it isn't there ? It seems to be a built-in module: import _io _io module '_io' (built-in) alike to import __builtin__ __builtin__ module '__builtin__' (built-in) as opposed to import win32ui win32ui module 'win32ui' from 'C:\Python27\lib\site-packages\Pythonwin\win32ui.pyd' and import os os module 'os' from 'C:\Python27\lib\os.pyc' Thomas -- http://mail.python.org/mailman/listinfo/python-list
USBLock : lock/unlock your computer with a USB key
I've been working on a little project and have a working Linux implementation so far. Basically it allows a user to use any USB stick as a key to lock and unlock their computer. More info in the repo or PyPi https://pypi.python.org/pypi/USBLock Basically run the program with -a to add a device (added once you insert it), then run it without any arguments. Insert the key again, and when you remove it your computer will lock. Insert the key again and it will unlock. It's not intended to provide military grade security, it's more of a convenience tool to launch built in screen locking software. Currently it locks a Linux box with xlock, pending a better solution. I wrote it as an exercise in playing around with USB media and events, and also because I needed a use for these old USB keys I have lying around :) Always looking for contributions, suggestions and improvements. Especially OS X and Win support. Repo: https://github.com/Svenito/usblock Thanks for your time. -- ./Sven -- http://mail.python.org/mailman/listinfo/python-list
Interactrive Python under Cygwin in Win7
I just installed ActiveState 2.7 64-bit on a Windows 7 machine running a current version of Cygwin. While python programs (both GUI and text-mode) run fine, I'm unable to use Python interactively from either the Cygwin terminal or in an ssh session. I tried adding the -u option, but that makes no difference. Interactive C-Python just hangs on startup. Is this bug specific to ActiveState Python, or is it also present in the vanilla C-Python build for Windows? -- Grant Edwards grant.b.edwardsYow! I want you to MEMORIZE at the collected poems of gmail.comEDNA ST VINCENT MILLAY ... BACKWARDS!! -- http://mail.python.org/mailman/listinfo/python-list
Re: Splitting of string at an interval
On Apr 8, 2013, at 11:10 AM, Arnaud Delobelle wrote: On 8 April 2013 14:21, Roy Smith r...@panix.com wrote: For a while, I was rabidly(*) into TDD (Test Driven Development). The cycle I was using was, Write a specification of a behavior, write a (failing) test for that behavior, then write the least possible amount of code to make the test pass. Lather, Rinse, Repeat, Ship The least possible part is important. It makes sure the cycles stay short (ideally, just a few minutes), and that you don't write any code for which you don't have tests. The least amount of code is often also not the best in terms of time or space complexity. Does this mean you have to write tests for time and space complexity as well? That's interesting, but I don't know of tools to help do that (time complexity seems easy enough, but space complexity seems tougher to me). If space and time complexity are important, then you need to write a test for those things. If you have no test for them, then it's not important and you shouldn't worry about it. At least according to the TDD catechism :-) From a somewhat less radical point of view, the first thing you want to do is get the code to produce correct results. Once you've got that (and a fully comprehensive test suite to prove it), then you can move on to making it more efficient, and your test suite serves as protection against behavior regressions. And, yes, I agree that testing for time and space complexity are not trivial, because making accurate, repeatable, and isolated measurements of those things is often surprisingly complicated. I can't help point out, however, that if your initial implementation is to have your code return a constant, it's pretty likely to be an optimum solution in both time and space :-) --- Roy Smith r...@panix.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Splitting of string at an interval
On Tue, Apr 9, 2013 at 1:37 AM, Roy Smith r...@panix.com wrote: I can't help point out, however, that if your initial implementation is to have your code return a constant, it's pretty likely to be an optimum solution in both time and space :-) Likely, but not certain. # 1 def fifty_stars(): return ** # 2 fifty_stars=lambda **50 Okay, that's just getting 2AM stupid now. :) ChrisA -- http://mail.python.org/mailman/listinfo/python-list
Re: Splitting of string at an interval
On 8 April 2013 17:20, Chris Angelico ros...@gmail.com wrote: On Tue, Apr 9, 2013 at 1:37 AM, Roy Smith r...@panix.com wrote: I can't help point out, however, that if your initial implementation is to have your code return a constant, it's pretty likely to be an optimum solution in both time and space :-) Likely, but not certain. # 1 def fifty_stars(): return ** # 2 fifty_stars=lambda **50 There's a whole competition about writing the smallest program which outputs the song 99 bottles of beer: http://codegolf.com/99-bottles-of-beer Cheers, -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list
Re: How to do a Lispy-esque read?
On 8 April 2013 08:45, zeta.con...@gmail.com wrote: Suppose I want to read an object from some stream. How do I do it? For example, if the input stream contained the text: [1, # python should ignore this comment 2] and I do a read on it, I should obtain the result [1, 2] You might be interested in code.compile_command() (http://docs.python.org/2/library/code.html) -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list
Re: I hate you all
On Sun, 07 Apr 2013 01:30:45 +, Steven D'Aprano wrote: Am I the only one here who has used a typewriter? Tab stops were set manually, to a physical distance into the page, using a mechanical stop. This long predates the rule that tab stops are every 8 characters. And your point is? Typewriters don't have a tab character. The information regarding tab stops is conveyed out-of-band from the typist to the typewriter, and doesn't need to persist beyond the time taken to type the document. -- http://mail.python.org/mailman/listinfo/python-list
Re: The usage of -m option of python
On 4/8/2013 10:50 AM, Albert van der Horst wrote: In article mailman.3484.1363662214.2939.python-l...@python.org, Terry Reedy tjre...@udel.edu wrote: On 3/18/2013 5:17 PM, Peng Yu wrote: Hi, I don't quite understand how -m option is used. And it is difficult to search for -m in google. Could anybody provide me with an example on how to use this option? python -m test at a command line runs the regression tests in the test package python -m test -v test_difflib runs test.test_difflib in verbose mode. I get for both : /usr/bin/python: test is a package and cannot be directly executed. What gives? (Official stable Debian distribution. Python 2.7) For me, 3.3 is default Python. Look in the 2.7 doc for 'test' and I believe it will tell you that you need to write 'test.regrtest'. tjr -- http://mail.python.org/mailman/listinfo/python-list
Re: Interactive development in Python à la Smalltalk?
On 4/8/2013 4:33 AM, Bienlein wrote: Hello, I'm absolutely new to Python, just looked at the language description for the first time. The first thought that came to my mind was whether you can program in Python in an interactive programming style, i.e. I can change code in the debugger which becomes immediately effective (no edit-compile loop) and I can also send messages to objects visible inside the debugger. The CPython interpreter has both a 'batch' mode (run code in a file) and an interactive mode (run code typed in response to a prompt). It also has a '-i' option to run code in batch mode and then switch to interactive mode so one can interrogate visible objects and call functions. The Idle IDE has editor windows linked to an interactive shell. When you run code in the editor window, it saves and runs it with the -i option so you can interactive with the results in the Shell. Compiling edited text to bytecode is typically so fast (well under a second) as to not be an issue. Then Python could become my replacemenet for my dearly missed Smalltalk, which to my great grief meanwhile really has become quite dead, I fear. In Smalltalk you can open up an inspector window (e.g. you don't have to get into debug mode), inspect objects in it and evaluate code in it, send messaages to objects. I guess this cannot be done in Python out of the box. But if changes made in the debugger became immediately effective, this would be interactive enough for my purposes. Idle also has a debugger window that does some of that, though it works better on non-Windows OSes. I have never actually used it. --- Terry Jan Reedy -- http://mail.python.org/mailman/listinfo/python-list
Re: I hate you all
On 2013-04-08, Nobody nob...@nowhere.com wrote: On Sun, 07 Apr 2013 01:30:45 +, Steven D'Aprano wrote: Am I the only one here who has used a typewriter? Tab stops were set manually, to a physical distance into the page, using a mechanical stop. This long predates the rule that tab stops are every 8 characters. And your point is? The point is that there is little historical precedent for assuming that tab stops are evenly and equally spaced across the page (let alone one particular fixed, even spacing) -- and people who mix spaces and tabs based on such false assumptions are responsible for their own bleeding foot. Typewriters don't have a tab character. The information regarding tab stops is conveyed out-of-band from the typist to the typewriter, and doesn't need to persist beyond the time taken to type the document. And the same is true when you don't mix tabs and spaces when indenting Python code. If you use tabs alone when indenting Python code it doesn't matter where the tabs are set -- they don't even have to be equally spaced -- the meaning of the source file is unambiguous. If you mix tabs and spaces, then you've got to provide out-of-band information regarding the position of the tab stops in order to make the source code unambiguous. Since there's no mechanism to provide that OOB tab stop info, mixed tabs and spaces isn't accepted. -- Grant Edwards grant.b.edwardsYow! I am covered with at pure vegetable oil and I am gmail.comwriting a best seller! -- http://mail.python.org/mailman/listinfo/python-list
Re: Interactrive Python under Cygwin in Win7
On Mon, Apr 8, 2013 at 11:20 AM, Grant Edwards invalid@invalid.invalidwrote: I just installed ActiveState 2.7 64-bit on a Windows 7 machine running a current version of Cygwin. While python programs (both GUI and text-mode) run fine, I'm unable to use Python interactively from either the Cygwin terminal or in an ssh session. I tried adding the -u option, but that makes no difference. Interactive C-Python just hangs on startup. Is this bug specific to ActiveState Python, or is it also present in the vanilla C-Python build for Windows? It's present in the vanilla build. I assume you're running mintty as I do. I just use the cygwin build for fooling around with python, and [WARNING: hold your nose] the cmd shell when I need Windows Python. You can also use the (old-fashioned?) cygwin.bat do start cygwin which doesn't give you as nice a terminal but does allow you to run bash and /c/Python27/Python interactively. Another option, which I just discovered, is bash under msys. It's been a while since I've used it so I can't remember the pro and con but you can run an interactive Windows python. -- http://mail.python.org/mailman/listinfo/python-list
Re: Interactrive Python under Cygwin in Win7
On 2013-04-08, David Robinow drobi...@gmail.com wrote: On Mon, Apr 8, 2013 at 11:20 AM, Grant Edwards invalid@invalid.invalidwrote: I just installed ActiveState 2.7 64-bit on a Windows 7 machine running a current version of Cygwin. While python programs (both GUI and text-mode) run fine, I'm unable to use Python interactively from either the Cygwin terminal or in an ssh session. I tried adding the -u option, but that makes no difference. Interactive C-Python just hangs on startup. Is this bug specific to ActiveState Python, or is it also present in the vanilla C-Python build for Windows? It's present in the vanilla build. I assume you're running mintty as I do. That's what I usually run when I'm not ssh'ed in. I just use the cygwin build for fooling around with python, and [WARNING: hold your nose] the cmd shell when I need Windows Python. Yea, that's what I finally fell back on. At least it has command line recall/editing, so it could be worse. I do almost all of my development on Linux and rarely do anything interactive under Windows, but once in a while it would be handy. You can also use the (old-fashioned?) cygwin.bat do start cygwin which doesn't give you as nice a terminal but does allow you to run bash and /c/Python27/Python interactively. Another option, which I just discovered, is bash under msys. It's been a while since I've used it so I can't remember the pro and con but you can run an interactive Windows python. Oh yea, I had forgotten about msys. -- Grant Edwards grant.b.edwardsYow! I'm having an at emotional outburst!! gmail.com -- http://mail.python.org/mailman/listinfo/python-list
Re: How to subclass a family
On 8 April 2013 10:44, Antoon Pardon antoon.par...@rece.vub.ac.be wrote:
Here is the idea. I have a number of classes with the same interface.
Something like the following:
class Foo1:
def bar(self, ...):
work
def boo(self, ...):
do something
self.bar(...)
What I want is the equivallent of:
class Far1(Foo1):
def boo(self, ...)
do something different
if whatever:
self.bar(...)
else:
Foo1.boo(self, ...)
Now of course I could subclass every class from the original family
from Foo1 to Foon but that would mean a lot of duplicated code. Is
there a way to reduce the use of duplicated code in such circumstances?
(Python 3)
--
class Foo1:
def bar(self):
print('Foo1.bar')
def boo(self, whatever):
print('Foo1.boo', whatever)
self.bar()
# class Foo2: ...(I'll let you define this one)
class DifferentBoo:
def boo(self, whatever):
print('DifferentBoo.boo', whatever)
if whatever:
self.bar()
else:
super().boo(whatever)
class Far1(DifferentBoo, Foo1): pass
# class Far2(DifferentBoo, Foo2): pass
--
foo = Foo1()
foo.bar()
Foo1.bar
foo.boo(1)
Foo1.boo 1
Foo1.bar
far = Far1()
far.bar()
Foo1.bar
far.boo(0)
DifferentBoo.boo 0
Foo1.boo 0
Foo1.bar
far.boo(1)
DifferentBoo.boo 1
Foo1.bar
HTH,
--
Arnaud
--
http://mail.python.org/mailman/listinfo/python-list
Re: I hate you all
On 2013-04-08, Walter Hurry walterhu...@lavabit.com wrote: Personally I have always used 4 spaces. I use it in SQL, shell scripts and Python. It makes code simple to read, and unambiguous. Same here -- mostly because that's what the emacs Python-mode does by default, and it seems to be commonly accepted right way. All things being equal, I'd pobably pick 2 or 3, but 4 is fine. The fact of Python enforcing it (or all tabs; a poor second choice) is *a good thing*, easy and natural IMHO. No need for end if or end loop or fi. One wonders whether OP is simply trolling. If he was trolling, he certainly deserves a prize. -- Grant Edwards grant.b.edwardsYow! Here we are in America at ... when do we collect gmail.comunemployment? -- http://mail.python.org/mailman/listinfo/python-list
Re: I hate you all
On Mon, 08 Apr 2013 19:48:58 +, Grant Edwards wrote: On 2013-04-08, Nobody nob...@nowhere.com wrote: On Sun, 07 Apr 2013 01:30:45 +, Steven D'Aprano wrote: Am I the only one here who has used a typewriter? Tab stops were set manually, to a physical distance into the page, using a mechanical stop. This long predates the rule that tab stops are every 8 characters. And your point is? The point is that there is little historical precedent for assuming that tab stops are evenly and equally spaced across the page (let alone one particular fixed, even spacing) -- and people who mix spaces and tabs based on such false assumptions are responsible for their own bleeding foot. Typewriters don't have a tab character. The information regarding tab stops is conveyed out-of-band from the typist to the typewriter, and doesn't need to persist beyond the time taken to type the document. And the same is true when you don't mix tabs and spaces when indenting Python code. If you use tabs alone when indenting Python code it doesn't matter where the tabs are set -- they don't even have to be equally spaced -- the meaning of the source file is unambiguous. If you mix tabs and spaces, then you've got to provide out-of-band information regarding the position of the tab stops in order to make the source code unambiguous. Since there's no mechanism to provide that OOB tab stop info, mixed tabs and spaces isn't accepted. Personally I have always used 4 spaces. I use it in SQL, shell scripts and Python. It makes code simple to read, and unambiguous. The fact of Python enforcing it (or all tabs; a poor second choice) is *a good thing*, easy and natural IMHO. No need for end if or end loop or fi. One wonders whether OP is simply trolling. -- http://mail.python.org/mailman/listinfo/python-list
Re: I hate you all
On Tue, Apr 9, 2013 at 7:29 AM, Grant Edwards invalid@invalid.invalid wrote: On 2013-04-08, Walter Hurry walterhu...@lavabit.com wrote: The fact of Python enforcing it (or all tabs; a poor second choice) is *a good thing*, easy and natural IMHO. No need for end if or end loop or fi. One wonders whether OP is simply trolling. If he was trolling, he certainly deserves a prize. I don't think he was trolling. It was a classic-model rant: I upgraded my dependency to a newer version and all my stuff broke. Commonly provokes anger, largely because many such upgrades do NOT break stuff (eg if I were to switch from gcc 4.5 to gcc 4.7 right now, I doubt anything would break, and my code would be able to use the new iterator syntax in c++11 - pity 4.7 isn't packaged for Debian Squeeze). The OP upgraded across an openly-non-backward-compatible boundary, and got angry over one particular aspect of backward compat that wasn't there. ChrisA -- http://mail.python.org/mailman/listinfo/python-list
Re: I hate you all
On Tue, 09 Apr 2013 08:00:06 +1000, Chris Angelico wrote: On Tue, Apr 9, 2013 at 7:29 AM, Grant Edwards invalid@invalid.invalid wrote: On 2013-04-08, Walter Hurry walterhu...@lavabit.com wrote: The fact of Python enforcing it (or all tabs; a poor second choice) is *a good thing*, easy and natural IMHO. No need for end if or end loop or fi. One wonders whether OP is simply trolling. If he was trolling, he certainly deserves a prize. I don't think he was trolling. It was a classic-model rant: I upgraded my dependency to a newer version and all my stuff broke. Commonly provokes anger, largely because many such upgrades do NOT break stuff (eg if I were to switch from gcc 4.5 to gcc 4.7 right now, I doubt anything would break, and my code would be able to use the new iterator syntax in c++11 - pity 4.7 isn't packaged for Debian Squeeze). The OP upgraded across an openly-non-backward-compatible boundary, and got angry over one particular aspect of backward compat that wasn't there. But wouldn't it have been easier simply to do do a quick sed or whatever rather than to spend hours here arguing? -- http://mail.python.org/mailman/listinfo/python-list
Re: I hate you all
On Tue, Apr 9, 2013 at 8:51 AM, Walter Hurry walterhu...@lavabit.com wrote: On Tue, 09 Apr 2013 08:00:06 +1000, Chris Angelico wrote: On Tue, Apr 9, 2013 at 7:29 AM, Grant Edwards invalid@invalid.invalid wrote: On 2013-04-08, Walter Hurry walterhu...@lavabit.com wrote: The fact of Python enforcing it (or all tabs; a poor second choice) is *a good thing*, easy and natural IMHO. No need for end if or end loop or fi. One wonders whether OP is simply trolling. If he was trolling, he certainly deserves a prize. I don't think he was trolling. It was a classic-model rant: I upgraded my dependency to a newer version and all my stuff broke. Commonly provokes anger, largely because many such upgrades do NOT break stuff (eg if I were to switch from gcc 4.5 to gcc 4.7 right now, I doubt anything would break, and my code would be able to use the new iterator syntax in c++11 - pity 4.7 isn't packaged for Debian Squeeze). The OP upgraded across an openly-non-backward-compatible boundary, and got angry over one particular aspect of backward compat that wasn't there. But wouldn't it have been easier simply to do do a quick sed or whatever rather than to spend hours here arguing? Probably. I don't profess to understand the OP's brain *that* much! ChrisA -- http://mail.python.org/mailman/listinfo/python-list
Re: im.py: a python communications tool
On Sun, Apr 7, 2013 at 3:36 PM, Steven D'Aprano steve+comp.lang.pyt...@pearwood.info wrote: On Sun, 07 Apr 2013 14:47:11 -0700, jhunter.dunefsky wrote: Actually, my current licence can be found here: https://github.com/jhunter-d/im.py/blob/master/LICENCE. Whaddaya think about this, Useneters? I think you're looking for a world of pain, when somebody uses your software, it breaks something, and they sue you. Your licence currently means that you are responsible for the performance of your software. Steven, they can't sue you for something they didn't pay for, because they never entered into an agreement, not did you. Mark Janssen Tacoma, Washington. -- http://mail.python.org/mailman/listinfo/python-list
Re: How to subclass a family
On Mon, Apr 8, 2013 at 5:44 AM, Antoon Pardon antoon.par...@rece.vub.ac.be wrote: Now of course I could subclass every class from the original family from Foo1 to Foon but that would mean a lot of duplicated code. Is there a way to reduce the use of duplicated code in such circumstances? As a rule, if there's duplicate code you can stuff it in a function. def create_subclass(Foo): class Far(Foo): def boo(self, ...) do something different if whatever: self.bar(...) else: super(Far, self).boo(self, ...) return Far Far1 = create_subclass(Foo1) Far2 = create_subclass(Foo2) ... Of course, this doesn't preserve the names of the subclasses properly. To do that you can add a parameter, for the name, although this is a little repetitive. Alternatively you can subclass yet again, as in: class Far1(create_subclass(Foo1)): pass Or you can even change the approach to a class decorator that adds a method: def add_method(cls): def boo(self, ...): do something different if whatever: self.bar(...) else: super(cls, self).boo(...) @add_method class Far1(Foo1): pass @add_method class Far2(Foo2): pass As a wise man once said, TIMTOWTDI. :( -- Devin -- http://mail.python.org/mailman/listinfo/python-list
Re: is _io.py missing from 2.7.4 ?
On Mon, 08 Apr 2013 06:12:02 -0700, dbv wrote: In 2.7.4, io.py shows: import _io import abc from _io import (DEFAULT_BUFFER_SIZE, BlockingIOError, UnsupportedOperation, open, FileIO, BytesIO, StringIO, BufferedReader, BufferedWriter, BufferedRWPair, BufferedRandom, IncrementalNewlineDecoder, TextIOWrapper) but, cannot find _io.py, though there is the old _pyio.py in the //Python27//Lib folder. If from _io import ... succeeds with no error, then it is physically impossible for it to be missing. To find where the _io module lives, at the interactive interpreter run this: import _io _io.__file__ Under Linux, you should get something like this: '/usr/local/lib/python2.7/lib-dynload/_io.so' and the equivalent under Windows. Note that in Python 3.3, the _io module is now built-in into the compiler, so _io.__file__ no longer exists. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Splitting of string at an interval
In article mailman.295.1365438635.3114.python-l...@python.org, Arnaud Delobelle arno...@gmail.com wrote: On 8 April 2013 17:20, Chris Angelico ros...@gmail.com wrote: On Tue, Apr 9, 2013 at 1:37 AM, Roy Smith r...@panix.com wrote: I can't help point out, however, that if your initial implementation is to have your code return a constant, it's pretty likely to be an optimum solution in both time and space :-) Likely, but not certain. # 1 def fifty_stars(): return ** # 2 fifty_stars=lambda **50 There's a whole competition about writing the smallest program which outputs the song 99 bottles of beer: http://codegolf.com/99-bottles-of-beer I see the top 10 entries are all written in Perl. I suppose this says something. -- http://mail.python.org/mailman/listinfo/python-list
Re: Splitting of string at an interval
On 2013-04-08 21:09, Roy Smith wrote: http://codegolf.com/99-bottles-of-beer I see the top 10 entries are all written in Perl. I suppose this says something. About the capabilities of Perl for writing such code, or about the drinking habits of Perl programmers? :-) Or-about-how-perl-drives-you-to-drink'ly yours, -tkc -- http://mail.python.org/mailman/listinfo/python-list
Re: im.py: a python communications tool
On 04/08/2013 07:16 PM, Mark Janssen wrote: On Sun, Apr 7, 2013 at 3:36 PM, Steven D'Aprano steve+comp.lang.pyt...@pearwood.info wrote: On Sun, 07 Apr 2013 14:47:11 -0700, jhunter.dunefsky wrote: Actually, my current licence can be found here: https://github.com/jhunter-d/im.py/blob/master/LICENCE. Whaddaya think about this, Useneters? I think you're looking for a world of pain, when somebody uses your software, it breaks something, and they sue you. Your licence currently means that you are responsible for the performance of your software. Steven, they can't sue you for something they didn't pay for, because they never entered into an agreement, not did you. That's a common misconception. No prior agreement is necessary to institute a lawsuit, at least in the United States. I'm not a lawyer, but I've been advised that the best you can hope for is to minimize the likelihood that a lawsuit will be successful, not to somehow guarantee that a lawsuit cannot be filed and prosecuted. Besides, an open-ended license might be acted on anywhere in the world, and who knows what some other jurisdictions might permit/require. -- DaveA -- http://mail.python.org/mailman/listinfo/python-list
Re: Splitting of string at an interval
On Mon, 08 Apr 2013 21:09:08 -0400, Roy Smith wrote: There's a whole competition about writing the smallest program which outputs the song 99 bottles of beer: http://codegolf.com/99-bottles-of-beer I see the top 10 entries are all written in Perl. I suppose this says something. When I write my own programming language, it will include a one-character built-in command to perform 99 bottles of beer, just so my language will always be the winner. In fact, I may make it a bare . so that not only will it be the shortest program, but also the smallest program in terms of number of non-white pixels. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: I hate you all
On Mon, 08 Apr 2013 19:43:51 +0100, Nobody wrote: On Sun, 07 Apr 2013 01:30:45 +, Steven D'Aprano wrote: Am I the only one here who has used a typewriter? Tab stops were set manually, to a physical distance into the page, using a mechanical stop. This long predates the rule that tab stops are every 8 characters. And your point is? Typewriters don't have a tab character. The information regarding tab stops is conveyed out-of-band from the typist to the typewriter, and doesn't need to persist beyond the time taken to type the document. Both text editors and typewriters encode information about tab settings out of band. Editors encode that information in some combination of program configuration, command-line switches, environment variables, and embedded mode lines in the document itself. Typewriters encode that information in the typists' memory, or failing that, in the actual physical space left on the page. That's a difference that makes no difference. My point is that there were well-established semantics for what a tab should do, and the 8 character tab is not that. Pressing the tab key on a keyboard while entering text ought to instruct the editor to advance to a specified tab stop capable of being set anywhere on the page. Word processors use that model: the word processor stores the positions of the tab stops out of band, usually in the paragraph formatting or style sheet, but in principle they could keep the position of the tab stops global to the document or even global to the application. Good text editors also support this model. Some versions of Vim, for example, include a feature called variable tabstops. Emacs includes a variable called tab-stop-list which can set variable tab stops[1]. Even the Linux command less supports variable width tabs, with the -x option. In case you think this is only for Unix editors, the Windows Boxer Text Editor also supports variable tab stops. There may, or may not be, good reasons for an eight character default setting for tab stops. But eight characters is not, and never has been, the One True Way of setting tab stops. [1] Although what happens when you press the tab key in Emacs is so complicated that only three people in the world have ever understood it fully. The first is Richard Stallman, then second is dead, and the third has gone mad. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Splitting of string at an interval
On 2013.04.08 21:38, Steven D'Aprano wrote: In fact, I may make it a bare . so that not only will it be the shortest program, but also the smallest program in terms of number of non-white pixels. Until someone implements it in Whitespace. -- CPython 3.3.0 | Windows NT 6.2.9200 / FreeBSD 9.1 -- http://mail.python.org/mailman/listinfo/python-list
Re: How to subclass a family
On Mon, 08 Apr 2013 11:44:51 +0200, Antoon Pardon wrote: Here is the idea. I have a number of classes with the same interface. Something like the following: class Foo1: def bar(self, ...): work def boo(self, ...): do something self.bar(...) What I want is the equivallent of: class Far1(Foo1): def boo(self, ...) do something different if whatever: self.bar(...) else: Foo1.boo(self, ...) What do you mean, the equivalent of? What's wrong with the code as given? Now of course I could subclass every class from the original family from Foo1 to Foon but that would mean a lot of duplicated code. Is there a way to reduce the use of duplicated code in such circumstances? I don't understand your question. The reason for using inheritance is to reduce the amount of duplicated code. If you're ending up with more code, you're doing something wrong. You're probably badly designing your methods, or your classes, or both. If you give a less contrived example, perhaps we can help. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: im.py: a python communications tool
On Mon, Apr 8, 2013 at 7:05 PM, Dave Angel da...@davea.name wrote: On 04/08/2013 07:16 PM, Mark Janssen wrote: On Sun, Apr 7, 2013 at 3:36 PM, Steven D'Aprano steve+comp.lang.pyt...@pearwood.info wrote: On Sun, 07 Apr 2013 14:47:11 -0700, jhunter.dunefsky wrote: Actually, my current licence can be found here: https://github.com/jhunter-d/im.py/blob/master/LICENCE. Whaddaya think about this, Useneters? I think you're looking for a world of pain, when somebody uses your software, it breaks something, and they sue you. Your licence currently means that you are responsible for the performance of your software. Steven, they can't sue you for something they didn't pay for, because they never entered into an agreement, not did you. That's a common misconception. No prior agreement is necessary to institute a lawsuit, at least in the United States. I'm not a lawyer, but I've been advised that the best you can hope for is to minimize the likelihood that a lawsuit will be successful, not to somehow guarantee that a lawsuit cannot be filed and prosecuted. Clearly anyone can file a lawsuit, I could file one against you for offending me, for example. The issue I was poorly raising is whether such a case would have merit. In the case of free (libre) open source software, such a case would have no merit, because such software never promises anyone *anything*. But someone would have to make the case and train the court. The court simply has not become appraised of what free, libre, open source software is. Really, one shouldn't be so afraid of such things and intimidated of our own system of law -- this is why the republic has degraded to lawyers, not representatives of the People. If a hospital takes your open source code and someone dies, the hospital must be held responsible, because the open source developer is not posing as an expert of anything, nor has she made it for some explicit purpose for you like in a commercial agreement. Mark -- http://mail.python.org/mailman/listinfo/python-list
Re: Can anyone please help me in resolving the error = AttributeError: Array instance has no attribute '__trunc__'
On Monday, April 8, 2013 3:37:38 PM UTC+5:30, bhk...@gmail.com wrote: I am trying to create 2D arrays without using advanced features like numpy, for this I have created 2 separate modules arrays.py and array2D.py. Here's the code for that: arrays.py module: == import ctypes class Array: #Creates an array with size elements. def __init__( self, size ): assert size 0, Array size must be 0 self._size = size print sixe is %s %self._size # Create the array structure using the ctypes module. PyArrayType = ctypes.c_int * size self._elements = PyArrayType() print type is e, type(self._elements) #self._elements = ctypes.c_int * size print Elements are self.element %s % self._elements # Initialize each element. #for i in range(self._size): # self.clear( i ) # Returns the size of the array. def __len__( self ): return self._size # Gets the contents of the index element. def __getitem__( self, index ): assert index = 0 and index len(self), Array subscript out of range return self._elements[ index ] # Puts the value in the array element at index position. def __setitem__( self, index, value ): assert index = 0 and index len(self), Array subscript out of range print Type is , type(index) self._elements[ index ] = value # Clears the array by setting each element to the given value. def clear( self, value ): for i in range( len(self) ) : self._elements[i] = value # Printing the arrays: def __str__(self): return self._elements array2D.py module == import arrays class Array2D : # Creates a 2-D array of size numRows x numCols. def __init__( self, numRows, numCols ): # Create a 1-D array to store an array reference for each row. self._theRows = arrays.Array( numRows ) # Create the 1-D arrays for each row of the 2-D array. print Num of Cloumns is, numCols for i in range( numRows ) : self._theRows[i] = arrays.Array( numCols ) # Returns the number of rows in the 2-D array. def numRows( self ): return len( self._theRows ) # Returns the number of columns in the 2-D array. def numCols( self ): return len( self._theRows[0] ) # Clears the array by setting every element to the given value. def clear( self, value ): for row in range( self.numRows() ): row.clear( value ) # Gets the contents of the element at position [i, j] def __getitem__( self, ndxTuple ): assert len(ndxTuple) == 2, Invalid number of array subscripts. row = ndxTuple[0] col = ndxTuple[1] assert row = 0 and row self.numRows() \ and col = 0 and col self.numCols(), \ Array subscript out of range. the1dArray = self._theRows[row] return the1dArray[col] # Sets the contents of the element at position [i,j] to value. def __setitem__( self, ndxTuple, value ): #assert len(ndxTuple) == 3, Invalid number of array subscripts. row = ndxTuple[0] col = ndxTuple[1] assert row = 0 and row self.numRows() \ and col = 0 and col self.numCols(), \ Array subscript out of range. the1dArray = self._theRows[row] the1dArray[col] = value arr = Array2D(2,4) print arr is %s %arr Traceback is : sixe is 2 type is e class 'arrays.c_long_Array_2' Elements are self.element arrays.c_long_Array_2 object at 0x00AA7F80 Cols in 4 Num of Cloumns is 4 !! i is 0 sixe is 4 type is e class 'arrays.c_long_Array_4' Elements are self.element arrays.c_long_Array_4 object at 0x00B60210 Type is type 'int' Traceback (most recent call last): File C:\Python27\Lib\array2D.py, line 53, in module arr = Array2D(2,4) File C:\Python27\Lib\array2D.py, line 16, in __init__ self._theRows[i] = arrays.Array( numCols ) File C:\Python27\Lib\arrays.py, line 36, in __setitem__ self._elements[ index ] = value AttributeError: Array instance has no attribute '__trunc__' Hi Dylan, Thank you for the alternative solution. I will look into that. -- http://mail.python.org/mailman/listinfo/python-list
Re: I hate you all
On Apr 9, 7:51 am, Steven D'Aprano steve +comp.lang.pyt...@pearwood.info wrote: On Mon, 08 Apr 2013 19:43:51 +0100, Nobody wrote: On Sun, 07 Apr 2013 01:30:45 +, Steven D'Aprano wrote: Am I the only one here who has used a typewriter? Tab stops were set manually, to a physical distance into the page, using a mechanical stop. This long predates the rule that tab stops are every 8 characters. And your point is? Typewriters don't have a tab character. The information regarding tab stops is conveyed out-of-band from the typist to the typewriter, and doesn't need to persist beyond the time taken to type the document. Both text editors and typewriters encode information about tab settings out of band. Editors encode that information in some combination of program configuration, command-line switches, environment variables, and embedded mode lines in the document itself. Typewriters encode that information in the typists' memory, or failing that, in the actual physical space left on the page. That's a difference that makes no difference. My point is that there were well-established semantics for what a tab should do, and the 8 character tab is not that. Pressing the tab key on a keyboard while entering text ought to instruct the editor to advance to a specified tab stop capable of being set anywhere on the page. Word processors use that model: the word processor stores the positions of the tab stops out of band, usually in the paragraph formatting or style sheet, but in principle they could keep the position of the tab stops global to the document or even global to the application. Dunno what you mean by 'out-of-band' If I set tabstops for a para to say 4-13-25-36 in a wordprocessor, save the file and look inside, I will find the tuple (4,13,25,36) in some encoded form. For a typewritten page, if the margin seems to be at 11th col, the reader cannot know from the page alone whether the typist 1. set the tab at 11 2. set the tab at 8 and pressed TAB followed by 3 SPC 3. Started with 2 and switched to 1 -- http://mail.python.org/mailman/listinfo/python-list
Re: Splitting of string at an interval
On Tue, Apr 9, 2013 at 12:38 PM, Steven D'Aprano steve+comp.lang.pyt...@pearwood.info wrote: On Mon, 08 Apr 2013 21:09:08 -0400, Roy Smith wrote: There's a whole competition about writing the smallest program which outputs the song 99 bottles of beer: http://codegolf.com/99-bottles-of-beer I see the top 10 entries are all written in Perl. I suppose this says something. When I write my own programming language, it will include a one-character built-in command to perform 99 bottles of beer, just so my language will always be the winner. In fact, I may make it a bare . so that not only will it be the shortest program, but also the smallest program in terms of number of non-white pixels. Don't be too specific, Steven. Also include a one-character built-in to emit the program's own source, and another to echo hello, world to standard output. And one to increment the accumulator, just for completeness. Who knows, it might already exist! http://esolangs.org/wiki/Cliff_L._Biffle ChrisA -- http://mail.python.org/mailman/listinfo/python-list
Re: I hate you all
On Apr 9, 9:06 am, rusi rustompm...@gmail.com wrote: Dunno what you mean by 'out-of-band' If I set tabstops for a para to say 4-13-25-36 in a wordprocessor, save the file and look inside, I will find the tuple (4,13,25,36) in some encoded form. To make this conform to current practices, I should use some length- unit not characters which I had in mind. -- http://mail.python.org/mailman/listinfo/python-list
Re: Can anyone please help me in resolving the error = AttributeError: Array instance has no attribute '__trunc__'
On Mon, 08 Apr 2013 21:01:04 -0700, bhk755 wrote: [snip over 260 lines of unnecessary quoted text] Hi Dylan, Thank you for the alternative solution. I will look into that. Please trim your replies. There's absolutely no reason to expect people to scroll through almost FOUR PAGES of quoted text just to get to a two line response. Thank you. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: I hate you all
On Mon, 08 Apr 2013 21:06:42 -0700, rusi wrote: On Apr 9, 7:51 am, Steven D'Aprano steve +comp.lang.pyt...@pearwood.info wrote: On Mon, 08 Apr 2013 19:43:51 +0100, Nobody wrote: On Sun, 07 Apr 2013 01:30:45 +, Steven D'Aprano wrote: Am I the only one here who has used a typewriter? Tab stops were set manually, to a physical distance into the page, using a mechanical stop. This long predates the rule that tab stops are every 8 characters. And your point is? Typewriters don't have a tab character. The information regarding tab stops is conveyed out-of-band from the typist to the typewriter, and doesn't need to persist beyond the time taken to type the document. Both text editors and typewriters encode information about tab settings out of band. Editors encode that information in some combination of program configuration, command-line switches, environment variables, and embedded mode lines in the document itself. Typewriters encode that information in the typists' memory, or failing that, in the actual physical space left on the page. That's a difference that makes no difference. My point is that there were well-established semantics for what a tab should do, and the 8 character tab is not that. Pressing the tab key on a keyboard while entering text ought to instruct the editor to advance to a specified tab stop capable of being set anywhere on the page. Word processors use that model: the word processor stores the positions of the tab stops out of band, usually in the paragraph formatting or style sheet, but in principle they could keep the position of the tab stops global to the document or even global to the application. Dunno what you mean by 'out-of-band' I mean that the information about the tab stops are not inherent to the tab itself. If I set tabstops for a para to say 4-13-25-36 in a wordprocessor, save the file and look inside, I will find the tuple (4,13,25,36) in some encoded form. There's nothing about the *tab character itself* that says jump to column 25. That information is metadata, stored external to the tab. That doesn't necessarily mean external to the file. A word-processing file carries a lot of metadata about the document. A plain text file is a better example. If I type up a document in (say) OpenOffice and use tabs to align a table, I might manually set the tabs to 4cm, 9cm, 18cm. When I hit tab, the cursor will jump to (say) 18cm, but if I save the document as plain text, that information is not stored anywhere in the document. It may be encoded in the OpenOffice config, e.g. in the Normal stylesheet. The same applies for documents created in a text editor, say Vim or Emacs. They may store the metadata about tab settings as mode lines in the document, or in an environment variable, or in a config file, or perhaps nowhere at all. Just like a typewriter. For a typewritten page, if the margin seems to be at 11th col, the reader cannot know from the page alone whether the typist 1. set the tab at 11 2. set the tab at 8 and pressed TAB followed by 3 SPC 3. Started with 2 and switched to 1 Very true. Manual typewriters are not identical to text editors. Typewriters can do both more *and* less than text editors. E.g. you can compose extra symbols by backspacing and overtyping, but you cannot usually distinguish between space-tab and space-space-tab. But from the perspective of duplicate what you see on the page, the difference between space-tab and space-space-tab does not matter. What matters is where you end up, not how you get there. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
classes and sub classes?
'Aloha Friends! I'm about to write an API against a huge propitiatory Oracle based network inventory database. The database have many different concepts stored in it's tables, can one concept can span over multiple tables. I would like to write a class for accessing each concept, but only have a single database connection throughout the whole program. I imagine some code along these lines, but cant figure out how to declare the classes that will make it work: # create a connection to the database and perform come basic login and initialization nib = NwInvDb(scott/tiger@ora) # find a device by ip interesting_device = nib.Device.lookup_by_ip(192.168.1.1) In this example I access the concept Device. Should I make the Device class inherit from NwInvDb? Or should I keep them separate? Later on I think I will even have to make some sort of sub-concepts, but lets postpone that game until I really have really seen the need! -- /Morten %-) -- http://mail.python.org/mailman/listinfo/python-list
[issue17659] First weekday
New submission from Izidor Matušov: There is no way how to figure out the first weekday: Does a week start with Monday or Saturday? (Or any other day?) According to documentation, module locale doesn't provide this information. Module calendar uses European convention (Monday is the first weekday). Purpose of this issue is to have a way how to return first weekday (Monday, Sunday, etc) Known workarounds: * http://blogs.gnome.org/patrys/2008/09/29/how-to-determine-the-first-day-of-week/ * https://github.com/projecthamster/hamster/blob/master/src/hamster/lib/stuff.py#L153 * http://stackoverflow.com/questions/4265697/how-to-determine-the-first-day-of-week-in-python -- components: Library (Lib) messages: 186280 nosy: IzidorMatusov priority: normal severity: normal status: open title: First weekday type: enhancement ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue17659 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue17655] Use writev() function in the io module
Charles-François Natali added the comment: I somehow doubt that the gain is worth the trouble, vectored disk I/O is not as interesting as vectored read/writes to a NIC. Actually, a quick search returned this link: http://www.mail-archive.com/dev@httpd.apache.org/msg23763.html Running the benchmark written by the Apache guys: $ rm -f writev.out; sync; sleep 5; ./test writev: 1s526601. copy+write: 1s323405. Doesn't really surprise me. So I'm -1, since it's unlikely to yield any improvement, and will greatly complicate the code. -- nosy: +neologix ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue17655 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue17502] unittest.mock: side_effect iterators ignore DEFAULT
Michael Foord added the comment: This was committed without NEWS entry or documentation update. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue17502 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue17655] Use writev() function in the io module
Antoine Pitrou added the comment: Agreed with Charles-François, it probably won't make a difference in practice. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue17655 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue17484] add tests for getpass
Antoine Pitrou added the comment: Did you forget to add test_getpass.py? -- nosy: +pitrou ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue17484 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue17656] Python 2.7.4 breaks ZipFile extraction of zip files with unicode member paths
Serhiy Storchaka added the comment: Yes, it's my fault. Here is a patch (with test) which fixes this regression in 2.7. This is 2.7 only issue, in Python 3 arcnames always are unicode. Please test on Windows. -- components: +Library (Lib) keywords: +patch priority: normal - high stage: - patch review type: crash - behavior versions: -Python 3.2, Python 3.3, Python 3.4 Added file: http://bugs.python.org/file29729/zipfile_extract_unicode.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue17656 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue16853] add a Selector to the select module
Antoine Pitrou added the comment: If this goes inside the select module, it could probably help issue #17552 (add socket.sendfile()) a bit. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue16853 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue16427] Faster hash implementation
Changes by Serhiy Storchaka storch...@gmail.com: Removed file: http://bugs.python.org/file27950/fast_str_hash.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue16427 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue16427] Faster hash implementation
Changes by Serhiy Storchaka storch...@gmail.com: Removed file: http://bugs.python.org/file27947/fast_hash_2.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue16427 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue17502] unittest.mock: side_effect iterators ignore DEFAULT
Roundup Robot added the comment: New changeset 4d8e9c5ba651 by Andrew Svetlov in branch '3.3': Add NEWS entry for #17502: Process DEFAULT values in mock side_effect that returns iterator. http://hg.python.org/cpython/rev/4d8e9c5ba651 New changeset f82fb8813407 by Andrew Svetlov in branch 'default': Add NEWS entry for #17502: Process DEFAULT values in mock side_effect that returns iterator. http://hg.python.org/cpython/rev/f82fb8813407 -- nosy: +python-dev ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue17502 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue17502] unittest.mock: side_effect iterators ignore DEFAULT
Andrew Svetlov added the comment: NEWS updated, thanks. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue17502 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue17615] String comparison performance regression
Serhiy Storchaka added the comment:
You can use a single switch instead nested switches:
switch ((kind1 3) + kind2) {
case (PyUnicode_1BYTE_KIND 3) + PyUnicode_1BYTE_KIND: {
int cmp = memcmp(data1, data2, len);
...
}
case (PyUnicode_1BYTE_KIND 3) + PyUnicode_2BYTE_KIND:
COMPARE(Py_UCS1, Py_UCS2);
break;
...
}
I don't know if there is any effect.
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components: +Interpreter Core
stage: needs patch - patch review
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[issue17660] mock.patch could whitelist builtins to not need create=True
New submission from Michael Foord: When patching builtin names (e.g. open) in a specific namespace you need to specify create=True or patch will refuse to create a name that doesn't exist. patch could whitelist the builtin names, when the patch target is a module object, to not require the create=True. -- assignee: michael.foord components: Library (Lib) keywords: easy messages: 186290 nosy: michael.foord priority: normal severity: normal stage: needs patch status: open title: mock.patch could whitelist builtins to not need create=True type: behavior versions: Python 3.4 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue17660 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue17660] mock.patch could whitelist builtins to not need create=True
Kushal Das added the comment: Working on this. -- nosy: +kushaldas ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue17660 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue17661] documentation of '%r' links to the wrong repr
New submission from Thomas Wouters: The documentation of '%r' in http://docs.python.org/2/library/stdtypes.html#string-formatting-operations links to the wrong repr, the module (http://docs.python.org/2/library/repr.html#module-repr) instead of the builtin function (http://docs.python.org/2/library/functions.html#func-repr). -- assignee: docs@python components: Documentation keywords: easy messages: 186292 nosy: docs@python, twouters priority: normal severity: normal status: open title: documentation of '%r' links to the wrong repr versions: Python 2.7 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue17661 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue17615] String comparison performance regression
Neil Hodgson added the comment: A quick rewrite showed the single level case slightly faster (1%) on average but its less readable/maintainable. Perhaps taking a systematic approach to naming would allow Py_UCS1 to be deduced from PyUnicode_1BYTE_KIND and so avoid repeating the information in the case selector and macro invocation. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue17615 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue17484] add tests for getpass
R. David Murray added the comment: Indeed I did. That's what I get for staging it one day and committing it the next...I forgot I hadn't done the add command. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue17484 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue17484] add tests for getpass
Roundup Robot added the comment: New changeset 113ff45c3f11 by R David Murray in branch 'default': #17484: Actually add the getpass tests this time. http://hg.python.org/cpython/rev/113ff45c3f11 -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue17484 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue17484] add tests for getpass
R. David Murray added the comment: Thanks, Thomas. -- resolution: - fixed stage: - committed/rejected status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue17484 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue17659] First weekday
Changes by R. David Murray rdmur...@bitdance.com: -- nosy: +r.david.murray stage: - needs patch versions: +Python 3.4 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue17659 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue17615] String comparison performance regression
Antoine Pitrou added the comment:
You can use a single switch instead nested switches:
switch ((kind1 3) + kind2) {
case (PyUnicode_1BYTE_KIND 3) + PyUnicode_1BYTE_KIND: {
int cmp = memcmp(data1, data2, len);
...
}
Please let's not add this kind of optifuscation unless it has a large positive
effect.
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[issue17662] socketmodule raises on import when compiled using Setup.dist on 2.7.4
New submission from Bohuslav Slavek Kabrda:
When building extension modules of Python 2.7.4 through Modules/Setup.dist, the
socketmodule gets built badly, as it also needs to be compiled with
timemodule.c (see the attached patch).
This was caused by commit 8ec39bfd1f01, which introduced usage of
_PyTime_floattime() without fixing Setup.dist (note, that this is ok when
compiling through setup.py, as it has:
exts.append( Extension('_socket', ['socketmodule.c', 'timemodule.c'],
--
components: Build
files: python-2.7.4-properly-compile-socketmodule-by-Setupdist.patch
keywords: patch
messages: 186298
nosy: bkabrda
priority: normal
severity: normal
status: open
title: socketmodule raises on import when compiled using Setup.dist on 2.7.4
type: crash
versions: Python 2.7
Added file:
http://bugs.python.org/file29730/python-2.7.4-properly-compile-socketmodule-by-Setupdist.patch
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[issue17658] pythonw.exe crashes on opening IDLE
Amaury Forgeot d'Arc added the comment: Hum, do you have any environment variable that refer to Python27? In a terminal window (cmd.exe), try the following command: set | findstr /i python -- nosy: +amaury.forgeotdarc ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue17658 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue17663] re.sub not replacing all
New submission from z06steve: fails to replace last occurrence of string v_wofstgvw, reproduced in 3.2.3, 3.2.4 and 3.3.1 a=''' -- V_INT_CTRC_ENTRY_DATE REPLACE VIEW V_WOFSTGVW.V_INT_CTRC_ENTRY_DATE AS LOCKING ROW FOR ACCESS SELECT D.DY DY, D.DW_CRRT_FL CURRENT_FLAG, D.MTH CURRENT_MTH, (CAST(D.DY AS DATE) - EXTRACT(DAY FROM (CAST( D.DY AS DATE)))+1) CURRENT_MTH_BEG_DT, ADD_MONTHS ((CAST(D.DY AS DATE) - EXTRACT(DAY FROM (CAST( D.DY AS DATE)))+1) , 1) - 1 CURRENT_MTH_END_DT, D.WOFC_MTH_END_FLG CURRENT_MTH_END_FLG, D.WOFC_QTR_END_FLG CURRENT_QTR_END_FL, D.YR CURRENT_YEAR, ((D.YR||'01/01')(DATE)) CURRENT_YEAR_BEG_DT , ((D.YR||'12/31')(DATE)) CURRENT_YEAR_END_DT , D.WOFC_YR_END_FLG CURRENT_YEAR_END_FL, D.HDAY_FLG HOLIDAY_FLG, CAST(ADD_MONTHS (CASE WOFC_MTH_END_FLG WHEN 'Y' THEN WOFCO_FRST_DY_MTH ELSE WOFCO_BEGIN_MTH_DT END, -1)AS CHAR(7)) PREV_REP_MTH, ADD_MONTHS (CASE WOFC_MTH_END_FLG WHEN 'Y' THEN WOFCO_FRST_DY_MTH ELSE WOFCO_BEGIN_MTH_DT END, -1 ) PREV_REP_MTH_BEG_DT, ADD_MONTHS (CASE WOFC_MTH_END_FLG WHEN 'Y' THEN D.DY ELSE D.WOFCO_MTH_END_DT END, -1 ) PREV_REP_MTH_END_DT , D.PREV_MTH PRIOR_MTH, PSETM.PRIOR_SET_CURRENT_MTH, PSETM.PRIOR_SET_CURRENT_MTH_BGN_DT, PSETM.PRIOR_SET_CURRENT_MTH_END_DT, PREPSETM.PRIOR_SET_REP_MTH, PREPSETM.PRIOR_SET_REP_MTH_BGN_DT, PREPSETM.PRIOR_SET_REP_MTH_END_DT, CASE WOFC_MTH_END_FLG WHEN 'Y' THEN MTH ELSE PREV_MTH END REP_MTH, CASE WOFC_MTH_END_FLG WHEN 'Y' THEN WOFCO_FRST_DY_MTH ELSE WOFCO_BEGIN_MTH_DT END REP_MTH_BEG_DT, CASE WOFC_MTH_END_FLG WHEN 'Y' THEN D.DY ELSE D.WOFCO_MTH_END_DT END REP_MTH_END_DT, CASE WOFC_MTH_END_FLG WHEN 'Y' THEN ADD_MONTHS (D.WOFCO_FRST_DY_MTH, 12 ) ELSE ADD_MONTHS (D.WOFCO_BEGIN_MTH_DT, 12) END REP_MTH_NEXT_YEAR_BEG_DT, CASE WOFC_MTH_END_FLG
[issue17660] mock.patch could whitelist builtins to not need create=True
Kushal Das added the comment: Initial patchset along with documentation and tests update. -- keywords: +patch Added file: http://bugs.python.org/file29731/issue17660.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue17660 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
