Re: Addind imports to a class namespace
Thank you for your replies. I have factored out the dependency and everything is solved. Cheers, Ryan -- http://mail.python.org/mailman/listinfo/python-list
Re: Addind imports to a class namespace
Thanks for your help Peter. I'm thinking that perhaps this isn't a circular import and that I don't understand importing. Here is a better explanation of my case (I am using Django): I have file x.py that declares classes A, B, C. There is also a file y.py that contains two methods T, U and the class that we are talking about above. x.py uses a dispatcher system to connect a signal to methods T and U in y.py so it does: from y import T, U. y.py needs to use classes A, B, C which is basically Menu and Link (and some other class) above so I am thinking that if in y.py I have from x import A, B, C that will cause a circular import? Is this not correct and if it isn't can you explain why? Does using from ... import X, Y, Z, i.e. explicit imports avoid this problem or does it exacerbate it? Thanks, Ryan -- http://mail.python.org/mailman/listinfo/python-list
Re: Addind imports to a class namespace
Okay so below is the acutal code. I am starting to think there is no reason why I can't install the post_save signal in signals.py itself and thereby avoid this issue entirely. models.py: class Link(CommonAbstractModel): ... class Menu(CommonAbstractModel): class StaticPage(CommonAbstractModel): ,,, class CachedMenuXhtml(CommonAbstractModel): ... post_save.connect(signals.build_menu, sender=Link) post_save.connect(signals.build_menu, sender=Menu) # Signlas for caching of menu XHTML class GenerateMenuXhtml(threading.Thread): def __init__(self, instance): from asqcom.apps.staticpages.models import Menu, Link, CachedMenuXhtml self.Link = Link self.Menu = Menu self.CachedMenuXhtml = CachedMenuXhtml # Function to run on post_save signal def build_menu(sender, instance, **kwargs): GenerateMenuXhtml(instance).start() -- http://mail.python.org/mailman/listinfo/python-list
Addind imports to a class namespace
Greetings, In order to avoid circular imports, I have a class that I want to improve upon: Class GenerateMenuXhtml(threading.Thread): Subclasses a threading.Thread class to generate a menu's XHTML in a separate thread. All Link objects that have this menu associated with it are gathered and combined in an XHTML unordered list. If the sender is of type Link, then all menus associated with that link are iterated through and rebuilt. def __init__(self, instance): from asqcom.apps.staticpages.models import Menu, Link self.Link = Link self.Menu = Menu As you can see I just expose these imports by attaching them to members of the class. There must be prettier option though where I can just add these imoprts to the class's namespace so all methods of any instance will have access to the imported modules. How would I go about doing this? How can I access the namespace of any class? Through Class.__dict__? Thanks, Ryan -- http://mail.python.org/mailman/listinfo/python-list
Validating cElementTrees with lxml
If I have a cElementTree.ElementTree (or the one from the Standard Library), can I use lxml's validation features on it since it implements the same ElementTree API? Thanks, Ryan -- http://mail.python.org/mailman/listinfo/python-list
Stripping whitespace
Hello. I have a string like 'LNAME PASTA ZONE'. I want to create a list of those words and basically replace all the whitespace between them with one space so i could just do lala.split(). Thank you! Ryan Kaskel -- http://mail.python.org/mailman/listinfo/python-list
Re: Stripping whitespace
On Jan 23, 2:04 pm, Marc 'BlackJack' Rintsch [EMAIL PROTECTED] wrote: On Wed, 23 Jan 2008 10:50:02 -0800, ryan k wrote: Hello. I have a string like 'LNAME PASTA ZONE'. I want to create a list of those words and basically replace all the whitespace between them with one space so i could just do lala.split(). Thank you! You *can* just do ``lala.split()``: Indeed you can thanks! In [97]: lala = 'LNAME PASTA ZONE' In [98]: lala.split() Out[98]: ['LNAME', 'PASTA', 'ZONE'] Ciao, Marc 'BlackJack' Rintsch -- http://mail.python.org/mailman/listinfo/python-list
Re: Stripping whitespace
I am taking a database class so I'm not asking for specific answers. Well I have this text tile: http://www.cs.tufts.edu/comp/115/projects/proj0/customer.txt And this code: # Table and row classes used for queries class Row(object): def __init__(self, column_list, row_vals): print len(column_list) print len(row_vals) for column, value in column_list, row_vals: if column and value: setattr(self, column.lower(), value) class Table(object): def __init__(self, table_name, table_fd): self.name = table_name self.table_fd = table_fd self.rows = [] self._load_table() def _load_table(self): counter = 0 for line in self.table_fd: # Skip the second line if not '-' in line: if counter == 0: # This line contains the columns, parse it column_list = line.split() else: # This is a row, parse it row_vals = line.split() # Create a new Row object and add it to the table's # row list self.rows.append(Row(column_list, row_vals)) counter += 1 Because the addresses contain spaces, this won't work because there are too many values being unpacked in row's __init__'s for loop. Any suggestions for a better way to parse this file? I don't want to cheat but just some general ideas would be nice. Thanks! -- http://mail.python.org/mailman/listinfo/python-list
Re: Stripping whitespace
On Jan 23, 2:53 pm, John Machin [EMAIL PROTECTED] wrote: On Jan 24, 6:17 am, ryan k [EMAIL PROTECTED] wrote: I am taking a database class so I'm not asking for specific answers. Well I have this text tile: http://www.cs.tufts.edu/comp/115/projects/proj0/customer.txt Uh-huh, column-aligned output. And this code: [snip] Because the addresses contain spaces, this won't work because there are too many values being unpacked in row's __init__'s for loop. Any suggestions for a better way to parse this file? Tedious (and dumb) way: field0 = line[start0:end0+1].rstrip() field1 = line[start1:end1+1].rstrip() etc Why dumb: if the column sizes change, you have to suffer the tedium again. While your sample appears to pad out each field to some predetermined width, some reporting software (e.g. the Query Analyzer that comes with MS SQL Server) will tailor the widths to the maximum size actually observed in the data in each run of the report ... so you write your program based on some tiny test output and next day you run it for real and there's a customer whose name is Marmaduke Rubberduckovitch-Featherstonehaugh or somesuch and your name is mud. Smart way: note that the second line (the one with all the dashes) gives you all the information you need to build lists of start and end positions. Thank you for your detailed response Mr. Machin. The teacher *said* that the columns were supposed to be tab delimited but they aren't. So yea i will just have to count dashes. Thank you! -- http://mail.python.org/mailman/listinfo/python-list
Re: Stripping whitespace
On Jan 23, 3:02 pm, John Machin [EMAIL PROTECTED] wrote: On Jan 24, 6:57 am, ryan k [EMAIL PROTECTED] wrote: So yea i will just have to count dashes. Read my lips: *you* counting dashes is dumb. Writing your code so that *code* is counting dashes each time it opens the file is smart. Okay it's almost working ... new parser function: def _load_table(self): counter = 0 for line in self.table_fd: # Skip the second line if counter == 0: # This line contains the columns, parse it column_list = line.split() elif counter == 1: # These are the dashes line_l = line.split() column_width = [len(i) for i in line_l] print column_width else: # This is a row, parse it marker = 0 row_vals = [] for col in column_width: start = sum(column_width[:marker]) finish = sum(column_width[:marker+1]) print line[start:finish].strip() row_vals.append(line[start:finish].strip()) marker += 1 self.rows.append(Row(column_list, row_vals)) counter += 1 Something obvious you can see wrong with my start finish code? ['rimon', 'rimon', 'Barr', 'Rimon', '22 Greenside Cres., Thornhill, ON L3T 6W9', '2', '', 'm', '102', '100 -', '22.13 1234567890', '[EMAIL PROTECTED]', ''] ['UNAME', 'PASSWD', 'LNAME', 'FNAME', 'ADDR', 'ZONE', 'SEX', 'AGE', 'LIMIT', 'BALANCE', 'CREDITCARD', 'EMAIL', 'ACTIVE'] -- http://mail.python.org/mailman/listinfo/python-list
Re: Stripping whitespace
On Jan 23, 5:37 pm, Steven D'Aprano [EMAIL PROTECTED]
cybersource.com.au wrote:
On Wed, 23 Jan 2008 11:05:01 -0800, Paul Rubin wrote:
ryan k [EMAIL PROTECTED] writes:
Hello. I have a string like 'LNAME
PASTA ZONE'. I want to create a list of those words and
basically replace all the whitespace between them with one space so i
could just do lala.split(). Thank you!
import re
s = 'LNAME PASTAZONE'
re.split('\s+', s)
Please tell me you're making fun of the poor newbie and didn't mean to
seriously suggest using a regex merely to split on whitespace?
import timeit
timeit.Timer(s.split(), s = 'one two three four').repeat()
[1.4074358940124512, 1.3505148887634277, 1.3469438552856445]
timeit.Timer(re.split('\s+', s), import re;s = 'one two
three four').repeat()
[7.9205508232116699, 7.8833441734313965, 7.9301259517669678]
--
Steven
The main topic is not an issue anymore.
--
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Re: Stripping whitespace
On Jan 23, 5:37 pm, Steven D'Aprano [EMAIL PROTECTED]
cybersource.com.au wrote:
On Wed, 23 Jan 2008 11:05:01 -0800, Paul Rubin wrote:
ryan k [EMAIL PROTECTED] writes:
Hello. I have a string like 'LNAME
PASTA ZONE'. I want to create a list of those words and
basically replace all the whitespace between them with one space so i
could just do lala.split(). Thank you!
import re
s = 'LNAME PASTAZONE'
re.split('\s+', s)
Please tell me you're making fun of the poor newbie and didn't mean to
seriously suggest using a regex merely to split on whitespace?
import timeit
timeit.Timer(s.split(), s = 'one two three four').repeat()
[1.4074358940124512, 1.3505148887634277, 1.3469438552856445]
timeit.Timer(re.split('\s+', s), import re;s = 'one two
three four').repeat()
[7.9205508232116699, 7.8833441734313965, 7.9301259517669678]
--
Steven
Much thanks to Machin for helping with the parsing job. Steven
D'Aprano, you are a prick.
--
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Re: Stripping whitespace
On Jan 23, 6:30 pm, John Machin [EMAIL PROTECTED] wrote: On Jan 24, 9:50 am, ryan k [EMAIL PROTECTED] wrote: Steven D'Aprano, you are a prick. And your reasons for coming to that stridently expressed conclusion after reading a posting that was *not* addressed to you are .? Because his tone is extremely condescending and quite frankly annoying. From this post to others, his terse remarks scar this community and fade its atmosphere of friendliness. -- http://mail.python.org/mailman/listinfo/python-list
Displaying future times
I have a schedule of times in the future that I want to display in a timezone the user sets. There is a useful module http://www.purecode.com/~tsatter/python/README.txt (at that URL) with a function that takes seconds from the epoch and a time zone and returns what is basically a datetime object. My question is how to I display the seconds from the epoch for a datetime object (which will be a datetime in the future) for the UTC timezone? -- http://mail.python.org/mailman/listinfo/python-list
Displaying future times
I have a schedule of times in the future that I want to display in a timezone the user sets. There is a useful module http://www.purecode.com/~tsatter/python/README.txt (at that URL) with a function that takes seconds from the epoch and a time zone and returns what is basically a datetime object. My question is how to I display the seconds from the epoch for a datetime object (which will be a datetime in the future) for the UTC timezone? -- http://mail.python.org/mailman/listinfo/python-list
Re: Displaying future times
On Oct 17, 1:52 pm, Steven D'Aprano [EMAIL PROTECTED] cybersource.com.au wrote: On Wed, 17 Oct 2007 12:20:06 +, ryan k wrote: I have a schedule of times in the future that I want to display in a timezone the user sets. There is a useful module http://www.purecode.com/~tsatter/python/README.txt(at that URL) with a function that takes seconds from the epoch and a time zone and returns what is basically a datetime object. My question is how to I display the seconds from the epoch for a datetime object (which will be a datetime in the future) for the UTC timezone? Is this a trick question? Won't the answer be The same way you would for a datetime in the past? To get the number of seconds from the epoch, see the function timegm() in the calendar module. -- Steven. Not a trick question at all... Cheers. -- http://mail.python.org/mailman/listinfo/python-list
Embedding interactive interpreter
Hi. I am trying to embed an interactive interpreter in a C++ application. I need to capture the output of int PyRun_InteractiveOne(FILE *fp, const char *filename). Is redirecting sys.stdout and sys.stderr after initializing the interpreter the best way to do this? Thanks, Ryan -- http://mail.python.org/mailman/listinfo/python-list
text wrapping help
I'm trying to text wrap a string but not using the textwrap module. I have 24x9 matrix and the string needs to be text wrapped according to those dimensions. Is there a known algorithm for this? Maybe some kind of regular expression? I'm having difficulty programming the algorithm. Thanks, Ryan -- http://mail.python.org/mailman/listinfo/python-list
Re: text wrapping help
Okay, I was a little vague in my last post...the matrix is like a Wheel of Fortune board and it knows nothing about newlines. After 24 characters it spills over onto the next line. Here is what I came up with: pre ## Wrap Text def wrap_text(in_str, chars_line): wrap text spaces = 0 new_str = tmp_str = while True: tmp_str = in_str[:chars_line] if tmp_str[chars_line-1].isspace(): new_str += tmp_str else: spaces = 0 for ch in reversed(tmp_str): if ch.isspace(): break spaces += 1 tmp_str = tmp_str[:chars_line-spaces] tmp_str += * spaces new_str += tmp_str in_str = in_str[chars_line-spaces:] if len(in_str) = chars_line: new_str += + in_str break return new_str if __name__ == '__main__': sample_text = Personal firewall software may warn about the connection IDLE makes to its subprocess using this computer's internal loopback interface. This connection is not visible on any external interface and no data is sent to or received from the Internet. print wrap_text(sample_text, 24) /pre It doesn't even run but when I go through it interactively it seems okay. Once again, any help is appreciated. On Feb 28, 7:06 pm, Ryan K [EMAIL PROTECTED] wrote: I'm trying to text wrap a string but not using the textwrap module. I have 24x9 matrix and the string needs to be text wrapped according to those dimensions. Is there a known algorithm for this? Maybe some kind of regular expression? I'm having difficulty programming the algorithm. Thanks, Ryan -- http://mail.python.org/mailman/listinfo/python-list
Re: text wrapping help
That works great but I need to replace the newlines with 24-(the index
of the \n) spaces.
On Feb 28, 8:27 pm, [EMAIL PROTECTED] wrote:
On Feb 28, 4:06 pm, Ryan K [EMAIL PROTECTED] wrote:
I'm trying to text wrap a string but not using the textwrap module. I
have 24x9 matrix and the string needs to be text wrapped according
to those dimensions. Is there a known algorithm for this? Maybe some
kind of regular expression? I'm having difficulty programming the
algorithm.
Try:
import re
sample_text = Personal firewall software may warn about the
connection IDLE makes to its subprocess using this computer's internal
loopback interface. This connection is not visible on any external
interface and no data is sent to or received from the Internet.
# assume 24 is sufficiently wide:
lines = map(lambda x: x.rstrip(),
re.findall(r'.{1,24}(?:(?=\S)\s|$)', sample_text.replace(\n, )))
print \n.join(lines)
--
Hope this helps,
Steven
--
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Help with dbm TypeError
I am writing a web application for mod_python that catalogs my home (book) library. For now, I am using the Python dbm module to store string representations of mod_python's req.form (using the mod_python.publisher handler) using unique IDs as keys. In the .db file, there is a key 'next' that holds the next key for the next form submission. A TypeError exception is raised though when I attempt to increment the 'next' key. This only occurs in mod_python. This code... self._db['next'] = str(int(self._db['next'])+1) raises this exception TypeError: string indices must be integers y = dbm.open(Test,c) next = 0 y['next'] = str(next) y['next'] = str(int(y['next'])+1) y['next'] '1' y['next'] = str(int(y['next'])+1) y['next'] '2' I do not understand the cause of this exception. I am using Python 2.3.5. Any help would be greatly appreciated. Ryan Kaskel -- http://mail.python.org/mailman/listinfo/python-list
