use a file as a database, access rights
Hi, i'd like to write a script that makes use of a database. It would be great if the database would store all its data in a file, that would be great for data exchange. It would also be great if i could use SQL, as i have some experience in that. Also, i NEED access rights to certain parts of the database. Several people should work on it and NEED to have different access rights. Can anybody give me some recommendations on what to use? Thanks for any hints, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
Re: use a file as a database, access rights
Hi, sorry for being unclear and thanks for your answers. Yes, i'd like to use a flat-file database AND access rights. One way i thought of would be to handle the access rights in the script that i write. But to let some other module handle it would also be great. If for example i could embed some SQL database and tell it to store all its tables in ONE FILE it would be quite easy to do. I want to write that application cross-platform, at least Win32 AND Linux. Best regards, Torsten. > Torsten, > > Please explain the environment you are planning to use - Operating > System, whether you have full control of the machine that runs the > database, how many users?. > > If you are using Windows and if your needs are simple, you can use > Access as it has some simple access control that can be setup. > > Also, the part about "database would store all its data in a file" is > not very clear. Are you wanting to use a flat-file database and also > have security implemented in it? If you are on linux/*BSD machine, > consider using a real database. > > Fine access control can be implemented in your application (e.g. only > the creator of a record and his/her superiors can edit it, all others > view it) > > Please send more details to receive useful recommendations. > Thanks, > --Kartic -- http://mail.python.org/mailman/listinfo/python-list
SuSE 9.1: updating to python-2.4
Hi, along with my distribution SuSE 9.1 came python 2.3.3. I'd like to update to 2.4 now, is this an easy thing to do or will lots of installed modules refuse to work then? Is there an easy way to find out what i need to update? Thanks for any hints, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
Referenz auf Variable an Funktion Ãbergeben?
Hallo, ich mÃchte eine Funktion schreiben, der ich eine Referenz auf einen String Ãbergeben kann und die dann einige Ãnderungen am String vornimmt. In Perl wÃrde ich also ein \$string Ãbergeben und in der Funktion auf $$string zugreifen. Geht sowas auch in Python? Ich habe von "global" gelesen, das scheint dem was ich suche am nÃchsten zu kommen, allerdings trifft es das Problem auch nicht, da ich von einer Unterfunktion aus eine Unterfunktion aufrufen mÃchte, also tief verschachtelt. Und global greift nach meinem VerstÃndnis auf den ganz globalen Namensraum zu und nicht auf den der aufrufenden Funktion. Geht sowas vielleicht mit weakref? Danke fÃr Tipps, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
reference or pointer to some object?
Hi,
i'd like to pass a reference or a pointer to an object
to a function. The function should then change the
object and the changes should be visible in the calling
function.
In perl this would be something like:
sub func {
$ref = shift;
$$ref += 123; # change
}
$a = 1;
func(\$a);
is something like this possible in python?
The keyword "global" does NOT fit this purpose to
my understanding as it only makes the variables of
the UPPERMOST level visible, not the ones of ONE
calling level above.
Is this somehow possible with weakref?
I don't want to pass the parameter to a function and
then return a changed value.
Is there some other mechanism in python available to
achieve a behaviour like this?
Thanks for any hints,
Torsten.
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Re: reference or pointer to some object?
Hi, thank you all for your explanations. I still wonder why a concept like "references" was not implemented in Python. I think it is (even if small) an overhead to wrap an object in a list or a dictionary. Isn't it possible to extend Python in a way to use real references? Or isn't that regarded as necessary? Thanks for any hints, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
Re: reference or pointer to some object?
Hi, > Could you give us a more concrete use case? My suspicion is that > anything complicated enough to be passed to a method to be modified will > probably be more than a simple int, float, str or tuple... In which > case, it will probably have methods to allow you to update it... yes, to be more explicit: I'm quite new to python and i wrote a small function that does a hexdump of a string. That string can be quite large, so i suspected a large overhead when the string would be copied and handed over to the function. But i think my understanding was wrong (though it is not yet clear). If i hand over a large string to a function and the function had the possibility to change it, wouldn't that mean that it is necessary to hand over a _copy_ of the string? Else, how could it be immutable? Thinking about all this i came to the idea "How would i write a function that changes a string with not much overhead?". def func(s): change s in some way, remove all newlines, replace some charaters by others, ... return s s = func(s) This seems to be a way to go, but it becomes messy if i hand over lots of parameters and expect some more return functions. Maybe it is because i did lots of perl programming, but func(\$s) looks easier to me. > In my case, rather than your original example, which you want to look > something like: > > def func(x): > x += 123 > > x = 5 > func(x) > > I'd just write: > > x = 5 > x += 123 You're right, of course. I'm sorry the second example is still a bit constructed, but i came across it by writing the hexdump utility and wanted to reduce overhead. Best regards, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
Re: reference or pointer to some object?
Hi, thank you all for your explanations. That's really great and helps me a lot. Thanks, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
Py_Object* Py_BuildValue, Py_INCREF necessary?
Hi, when i write an extension module in C and return a Py_Object* that i've built with Py_BuildValue, do i need to use Py_INCREF on that before i return it to python from my extension module or not? Thanks for hints, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
supplying constants in an extension module
Hi, i write an extension module in C at the moment. I want to define some constants (integer mainly, but maybe also some strings). How do i do that best within this extension module in C? Do i supply them as RO attributes? What's the best way for it? Thanks for hints, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
extension module, thread safety?
Hi, i write an extension module in C at the moment. This module does some work on some own data types that consist of some values. The functions that can change the data are written in C. The question came up if this is by itself thread safe, if some two or more threads try to change these data types, are the C functions by themselves are "atomic" or can they be interrupted be the perl interpreter and then (data types are in some inconsistent half-changed state) another function that works on these data is called? Thanks for hints, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
import hook, overwrite import?
Hi, is there some description available to overwrite the import hook? By googling i found out so far that i need to overwrite __builtins__.__import__ with something else. Can i also do this with a C function that is provided when using an embedded python interpreter? So my own C program provides this and when linking with python.lib the function is overwritten? Or is there some extension hook? Does this also handle "from module import *" not only the normal "import module"? Thanks for any hints, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
where's "import" in the C sources?
Hi, i tried to find the file and line in the C sources of python where the command "import" is implemented. Can anybody give me some hint on this? Thanks, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
Re: where's "import" in the C sources?
Hi David, thanks for the explanation. That is very helpful to me. Best regards, Torsten. David Bolen wrote: > Torsten Mohr <[EMAIL PROTECTED]> writes: > >> i tried to find the file and line in the C sources of python >> where the command "import" is implemented. Can anybody give >> me some hint on this? > > Well, there are several levels, depending on what you are looking for. > The literal "import" syntax in a source module is translated by the > Python compiler to various IMPORT_* bytecodes, which are processed in > the main interpreter loop (see ceval.c). > > They all basically bubble down to making use of the builtin __import__ > method, which is obtained from the builtin module defined in > bltinmodule.c. > > That in turn makes use of the import processing module whose code can > be found in import.c - which is the same source that also implements > the "imp" module to provide lower layer access to to the import > internals. > > Now, when it comes to physically loading in a module, Python source > and compiled modules are handled by import (well, not the compiling > part), but dynamically loaded extension modules are OS specific. You > can find the handling of such extension modules in OS-specific source > files dynload_*.c (e.g., dynload_win.c for Windows). > > All of these files can be found in the dist/src/Python directory in > the Python source tree. > > -- David -- http://mail.python.org/mailman/listinfo/python-list
GUI with sophisticated Table support
Hi, i want to write an application where i need a Table to display some values. The table should display a list of objects, so to say, a column for each attribute of the object. I'd also like the user to be able to change the width of each column, like in Excel. I'd prefer to use Tkinter, but i think it can't do all that. Is there a way for Tkinter to handle this? If not, what other GUI can do that? (wxPython?) Thanks for hints, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
build a static executable program with python
Hi, i'd like to build an executable file that is linked with a python library and executes a script via PyRun_SimpleString or similar functions. Is there a static library of python available, so the users don't need to install python? What about DLL modules, do i just need to compile them as a static lib, link them together with my program and call their init function? What about python modules, can i just use a tool like "freeze" or "py2exe" to break up the import hierarchy and call them before my script? Is there some more information about building a static executable available? Thanks for any hints, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
Re: GUI with sophisticated Table support
Hi, > Do a group-google search for *tkinter table*. That shows up quite a few > hits. thanks for that hint, but nearly every hit shows the Table of contents for Tkinter", which is not what i search for. My question here is rather in detail about Tkinters Table and if it can show resizable columns tho easily display a list of objects. I did not find any help searching for this with google, but i'd really rather like to use Tkinter over wxPython, that's the background of the question. Thanks for your help anyway, sorry if my question was unclear. Best regards, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
Re: build a static executable program with python
Hi, thank you very much for that detailled description. I will try to get as far as i can with this information and get back to you if i have any questions. Thanks a lot, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
Re: build a static executable program with python
Hi Adal, can you send me your mail address? I think the one in your posting is a spam stopper. Cheers, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
Plugin system, RuntimeWarning: Parent module 'ext_abc' not found while handling absolute import
Hi,
i try to write a plugin system that i want to use to let users extend
a module that i write.
Within the module there is an extension loader that loads an extension
module. This extension module should be able to import modules from
my system, which provides some extensions.
Basically, this here works but gives a warning:
RuntimeWarning: Parent module 'ext_abc' not found while handling absolute import
Below are the files, i wonder what is wrong.
It would be great if anybody could give me a hint, what provokes that
warning?
Best regards,
Torsten.
FILE psys.py:
import mymodule.ext_loader
import sys
import os.path
here = os.path.abspath('.')
mpath = os.path.abspath('mymodule')
epath = os.path.abspath('extension')
sys.path.append(here)
sys.path.append(mpath)
mymodule.ext_loader.load('ext_abc')
FILE mymodule/__init__.py:
__all__ = ['base', 'ext_loader']
FILE mymodule/ext_loader.py:
import imp
import os.path
def search_file(fname):
for e in ['extension']:
candidate = os.path.join(os.path.expanduser(e), fname)
if os.path.exists(candidate):
return candidate
return None
def load(modname):
fname = modname + ".py"
abname = search_file(fname)
fd = open(abname, "rb")
mod = imp.load_module(fname, fd, abname, ['py', 'r', imp.PY_SOURCE])
fd.close()
FILE mymodule/base.py:
def func1():
print "func1 called !"
FILE extension/ext_abc.py:
import base
base.func1()
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Re: Plugin system, RuntimeWarning: Parent module 'ext_abc' not found while handling absolute import
Hello,
>> Basically, this here works but gives a warning:
>> RuntimeWarning: Parent module 'ext_abc' not found while handling
>> absolute import
>
>
>> here = os.path.abspath('.')
>
> (Unrelated to the main question, but you probably want to use
> os.path.dirname(os.path.abspath(__file__)) instead - the above just
> returns the current directory, which might not be the directory containing
> the module)
Thanks, i'll try that.
>> mpath = os.path.abspath('mymodule')
>> epath = os.path.abspath('extension')
>>
>> sys.path.append(here)
>> sys.path.append(mpath)
>>
>> FILE mymodule/__init__.py:
>
> So mymodule is actually a package. Packages should *not* appear in
> sys.path.
Oh, how does it find modules then? I thought that would be PYTHONPATH or
sys.path ?
Best regards,
Torsten.
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Reference or Value?
Hi, how is the rule in Python, if i pass objects to a function, when is this done by reference and when is it by value? def f1(a): a = 7 b = 3 f1(b) print b => 3 Integers are obviously passed by value, lists and dicts by reference. Is there a general rule? Some common formulation? Thanks for any hints, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
package structure?
Hi, in a package i'd like to have a structure like this: Files end with ".py", others are directories: mod __init__.py # sets __all__ = ['smod1'] smod1.py # contains AClass() smod1 __init__.py # sets __all__ = ['abc', 'def'] abc.py def.py So i can now do: import mod.smod1.abc import mod.smod1 But functions/classes in smod1.py are not found: a = mod.smod1.AClass() I know this is somehow ambiguous, but i wonder how else i can make "mod" have subpackages and modules. I wonder how i can make AClass() known in that package. Thanks for any hints, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
Re: package structure?
>> I wonder how i can make AClass() known in that package. >> > > Why don't you put the contents of smod1.py in mod/smod1/__init__.py? > It'll work this way. Of course, thanks for that hint. Best regards, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
parse C expression?
Hi, i found some examples when googling for the subject but nothing really matched. Is there a standard module available that lets me parse a syntax like "C" with numbers, operators, braces, variables and function calls? I'd like to use this to parse an own kind of configuration language and preferred would be just standard modules. Is there something available that is maybe based on shlex? Thanks for any hints, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
Package / Module Hierarchy question
Hi, in a package i use these files: module (dir) __init__.py submodule __init__.py qwe.py qwe.py defines a class that derives from a class defined in submodule (and by that in submodule/__init__.py. Is it possible somehow to write in qwe.py to import submodule (though __init__.py is in the same directory as qwe.py ? I'd like to keep the tests for qwe.py within qwe.py, the code that i want to execute when i directly execute qwe.py and then: if __name__ == '__main__': some_test_code() Or do i need to write an external test code? Thanks for any hints, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
structuring a package?
Hi, i have a question on how to structure a package best, would be great if anybody could give me some hint on this: Assuming i have a base class GraphicObject and derived from that some classes like Square, Circle, ... It looks natural to me to write in a code that uses the package: import graphic import graphic.square import graphic.circle That way i'd have to structure the code like this: graphic/ __init__,py (GraphicObject) square.py (Square) circle.py (Circle) Does that make sense like this? Are there better ways to structure things in Python? One thing that bothers me is that when i write in circly.py something like "import graphic", then i can't have the test code for the Circle within circle.py, at least it looks to me like this. The closest thing that handles this issue that i could find was PEP 328, but it doesn't cover this problem. Thanks for any hints, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
Re: structuring a package?
Hello James, >> That way i'd have to structure the code like this: >> >> graphic/ >> __init__,py (GraphicObject) >> square.py (Square) >> circle.py (Circle) >> >> Does that make sense like this? > > This seems perfectly acceptable. Thanks for that hint. Do you see a way that i could write in circle.py: circle.py: import graphic class Circle(graphic.GraphicObject): . if __name__ == '__main__': abc = Circle() abc.some_test_code() Thanks for any hints, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
create PyString
Hi, in an extension module i'd like to create a very large PyString. As the string is very large i'd first like to create the string and let Python allocate the space for it and then fill it from my code. But the only interface that i can find in Python/stringobject.h is: PyAPI_FUNC(PyObject *) PyString_FromStringAndSize(const char *, Py_ssize_t); But my extension module does not have the data consecutively in memory. If i'd use this function i'd first have to allocate the data, construct the string and then let python _again_ allocate the same amount of memory and copy my data. Is there a way to tell python to: 1. let python create a PyString with an allocated buffer 2. let my extension module fill the buffer 3. let python validate the strings hash value and whatever else is necessary? Thanks for any hints, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
new style classes, __new__, __init__
Hi, i have some questions related to new style classes, they look quite useful but i wonder if somebody can give me an example on constructors using __new__ and on using __init__ ? I just see that when using it i can't give parameters to __new__ and when i additionally define __init__ then __new__ is not called. So i can use __new__ only for classes whose constructors don't have parameters? class C2: def __new__(self): print "new called" self.a = 8 def __init__(self, a): print "init called" self.a = a def fct(self): print self.a a = C2(7) a.fct() This way __new__ is not called, if i remove __init__ then there are too many parameters to __new__, if i add a parameter to __new__ then it says that __new__ does not take arguments. Thanks for any hints, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
Re: new style classes, __new__, __init__
Hello, > This way __new__ is not called, if i remove __init__ then > there are too many parameters to __new__, if i add a parameter > to __new__ then it says that __new__ does not take arguments. I just found an article that describes it better, this example works: class C2(object): def __new__(cls, a): obj = object.__new__(cls) print "new called" obj.a = 8 return obj __new__ = staticmethod(__new__) def __init__(self, a): print "init called" self.a = a def fct(self): print self.a a = C2(7) a.fct() Best regards, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
optparse
Hi,
i use the module optparse to parse the command line:
--example
#! /usr/bin/python
import optparse
parser = optparse.OptionParser()
parser.add_option("-v", "--verbose",
dest = 'verb',
help = 'be loud',
action = 'store_true',
default = 'store_false')
(opts, args) = parser.parse_args()
print "opts", opts
print "args", args
--example
If i call it without any parameters i get:
opts {'verb': 'store_false'}
args []
I would rather like to see the actual value False in "opts",
did i use some wrong parameters somewhere? I can't imagine
that this is the wanted behaviour of optparse.
Thanks for any hints,
Torsten.
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Re: optparse
Hi,
> If i call it without any parameters i get:
>
> opts {'verb': 'store_false'}
> args []
If i call it with parameter -v i get:
./script.py -v
opts {'verb': True}
args []
I wonder what's wrong here.
Best regards,
Torsten.
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test if an input string starts with a python expression
Hi, i'd like to test if an input string starts with a python expression and also where that expression ends. An example: a_func(3*7, '''abc''') +5 pls some more The first part until (inclusive) the 5 should be found as an expression and the length of that string should also be detected. Background is that i want to embed some python expressions in a text and i want to evaluate them later. It is possible that the embedded expressions span several lines. Alternatively, is it possible to define a start- and an end-marker that define the embedded expression and find the expression using a regular expression? If the expression contains strings, these strings could contain the end-marker which should not be found inside strings. Example: start: < end: > < some_func(r">")> Can anybody tell me how to do this best? Can i do this using just modules from the python library? Thanks for any hints, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
deriving from array.array
Hello, i try to derive a class from array.array: import array class Abc(array.array): def __init__(self, a, b): array.array.__init__(self, 'B') self.a = a self.b = b a = Abc(4, 5) print a print a.a I get an error for "a = Abc(4, 5)", seems the parameters are forwarded to array's __init__ as they are. Though i explicitly call __init__() for array. I'd like to use array and make sure it's type is always 'B'. I'd like to derive because i don't want to rewrite all the methods like __getiem__ for my class and then call array's __getitem__. How do i best derive from array.array? Thanks for any hints, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
Re: deriving from array.array
Hello, thanks a lot for your hint, it works fine. >> I get an error for "a = Abc(4, 5)", seems the parameters are >> forwarded to array's __init__ as they are. > > No, with CPython they're forwarded to __new__. Not sure if i understand this correctly, if i derive from other classes (like wxpython widgets) i always call the bases __init__ . >> Though i explicitly >> call __init__() for array. > > That's the constructor inherited from 'object', it takes no args (except > the self arg). Is there a way to find out what i need to call? I haven't found much in the documentation. From writing C extensions i knew about the "new" entry in the PyTypeObject struct but it seems there's more behind it. In docs.python.org i did not find much, is there an URL where i can read more? Best regards, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
Read / Write OpenOffice SpreadSheet ?
Hi, i search for a possibility to access OpenOffoce SpreadSheets from Python with a reasonably new version of Python. Can anybody point me to a package that can do this? Best regards, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
Re: Read / Write OpenOffice SpreadSheet ?
Hello, > There is no package needed to read or write the new open document files. > The files are merely a jar archive containing XML files. You can open > and update them using jar as a subprocess and manipulate the XML files > using your favorite XML libraries DOM/SAX/XPath/Etree/etc. thanks for your hint. I was aware of that, OO files are a bunch of zipped XML files. But, i searh for something more comfortable/highlevel that lets me just do things like doc.Cell(1, 3) = 'abc' or so. > If that doesn't suit you, you can manipulate them using OO.org through its > UNO interface; but, I find that much more involved then simply accessing > the files directly. Thanks, i read about it but as i understood it, UNO needs Python 2.3.x and i'd like to base on something actual. Best regards, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
Noddy with submodules?
Hi, i want to write a Python module that interfaces a DLL that we use in the office to do some measurement. So i'd like to write a python module in C (which i did before some times). But i'm not sure how i can create a module in a way that i can later do: import measurement import measurement.adc import measurement.adc.channels import measurement.pwm What do i need to do to create submodules within the initialisation code of a python module written in C? Maybe there is an example based on "noddy"? Thanks for any hints, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
Windows, CreateThread
Hi, in a python C module i may need to create a Thread to do some background observations / calculations. Are there any problems with Python doing something like this? Is there some special support on sharing data? I guess i can't call any Python functions from the thread, correct? Thanks for any hints, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
iterate over list while changing it
Hello, a = [1, 2, 3, 4, 5, 6] for i, x in enumerate(a): if x == 3: a.pop(i) continue if x == 4: a.push(88) print "i", i, "x", x I'd like to iterate over a list and change that list while iterating. I'd still like to work on all items in that list, which is not happening in the example above. The conditions in the example are not real but much more complex in reality. Can anybody tell me how to do this? Thanks for any hints, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
Python und Referenzen auf Variablen?
Hallo, ich möchte im Speicher eine verschachtelte Struktur aufbauen in der dict()s und list()s verwendet werden und tief ineinander verschachtelt sind. D.h. mehrere lists und dicts können jeweils wieder lists und dicts enthalten. Ich möchte als Einträge hauptsächlich int, float und string verwenden, ich muß aber auch Referenzen auf die anderen Einträge eintragen können, die vom Programm anders behandelt werden müssen. Die Schlüssel der dict()s werden sich vermutlich nicht mehr ändern wenn sie einmal zugewiesen sind. Die Indizes der list()s können sich zur Laufzeit allerdings schon ändern, wenn z.B. aus einer list() ein Eintrag gelöscht wird. Der nachfolgende Eintrag würde dann nachrücken und sich damit sein Index ändern. Wie könnte ich in so einer verschachtelten Struktur Referenzen abbilden? Viele Grüße, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
nested structure with "internal references"
Hi, sorry for posting in german before, that was a mistake. I'd like to use a nested structure in memory that consists of dict()s and list()s, list entries can be dict()s, other list()s, dict entries can be list()s or other dict()s. The lists and dicts can also contain int, float, string, ... But i'd also like to have something like a "reference" to another entry. I'd like to refer to another entry and not copy that entry, i need to know later that this is a reference to another entry, i need to find also access that entry then. Is something like this possible in Python? The references only need to refer to entries in this structure. The lists may change at runtime (entries removed / added), so storing the index may not help. Thanks for any hints, Torsten. -- http://mail.python.org/mailman/listinfo/python-list
