On Wed, Mar 3, 2010 at 8:19 AM, John Filben wrote:
> I am new to Python but have used many other (mostly dead) languages in the
> past. I want to be able to process *.txt and *.csv files. I can now read
> that and then change them as needed – mostly just take a column and do some
> if-then to cr
MRAB wrote:
[snip]
Simpler would be:
lines = f.readlines()
lines.sort(key=lambda line: line[ : 3])
or even:
lines = sorted(f.readlines(), key=lambda line: line[ : 3]))
Sure, but a complete newbie (I have this impression about OP) doesn't
have to know about lambda.
I expected
John, there's an error in my program, I forgot that list.sort() method
doesn't return the list (it sorts in place). So it should look like:
#!/usr/bin/python
def sortit(fname):
fo = open(fname)
linedict = {}
for line in fo:
key = line[:3]
linedict[key] = line
sor
MRAB writes:
> mk wrote:
>> John Filben wrote:
>>> I am new to Python but have used many other (mostly dead) languages
>>> in the past. I want to be able to process *.txt and *.csv files.
>>> I can now read that and then change them as needed – mostly just
>>> take a column and do some if-then t
mk wrote:
John Filben wrote:
I am new to Python but have used many other (mostly dead) languages in
the past. I want to be able to process *.txt and *.csv files. I can
now read that and then change them as needed – mostly just take a
column and do some if-then to create a new variable. My p
John Filben wrote:
I am new to Python but have used many other (mostly dead) languages in
the past. I want to be able to process *.txt and *.csv files. I can
now read that and then change them as needed – mostly just take a column
and do some if-then to create a new variable. My problem is s
I am new to Python but have used many other (mostly dead) languages in the
past. I want to be able to process *.txt and *.csv files. I can now read that
and then change them as needed – mostly just take a column and do some if-then
to create a new variable. My problem is sorting these files:
On Mar 12, 10:50 pm, "Andrew Rekdal" <[EMAIL PROTECTED]> wrote:
> Well, I can see how this could get real messy but within defining a GUI
> there are many elements and so the block of elements such as a wx.notebook
> for instance I would hope I could place all the code for this in another
> file an
Well, I can see how this could get real messy but within defining a GUI
there are many elements and so the block of elements such as a wx.notebook
for instance I would hope I could place all the code for this in another
file and somehow include it into place. This way I can work on layered
pane
On Mar 12, 9:42 pm, "Andrew Rekdal" <[EMAIL PROTECTED]> wrote:
> I am working in the class constructor defining elements of an application.
> The problem is the file is getting unmanageble and I am wanting to extend the
> contructor __init__ to another file.
>
> Is it possible to import directly
On Wed, 12 Mar 2008 19:42:44 -0500, Andrew Rekdal wrote:
> I am working in the class constructor defining elements of an
> application. The problem is the file is getting unmanageble and I am
> wanting to extend the contructor __init__ to another file.
>
> Is it possible to import directly into t
On Mar 12, 5:42 pm, "Andrew Rekdal" <[EMAIL PROTECTED]> wrote:
> I am working in the class constructor defining elements of an application.
> The problem is the file is getting unmanageble and I am wanting to extend the
> contructor __init__ to another file.
>
> Is it possible to import directly
I am working in the class constructor defining elements of an application. The
problem is the file is getting unmanageble and I am wanting to extend the
contructor __init__ to another file.
Is it possible to import directly into the contructor the contents of another
module file?
If so how wou
sorry lost the first line in pasting:
Python 2.4.1 (#1, Jun 21 2005, 12:38:55)
:/
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Jp Calderone wrote:
> fileIter = iter(big_file)
> for line in fileIter:
> line_after = fileIter.next()
>
> Don't mix iterating with any other file methods, since it will confuse the
> buffering scheme.
>
Isn't a file an iterable already?
[GCC 3.3.3 20040412 (Red Hat Linux 3.3.3-7)]
t; "always with a file").
WHEN it returns things other than files. Like a StringIO object,
which can be quite handy. True, it won't be a "big file", but it'd
be nice if the same code would tolerate it. I've used this with
e.g. PIL quite a bit when working with
Michael Hoffman wrote:
> Mike Meyer wrote:
>> Guido has made a pronouncement on open vs. file. I think he prefers
>> open for opening files, and file for type testing, but may well be
>> wrong. I don't think it's critical.
>
> He has said that open() may be used for things other than files in the
Mike Meyer wrote:
> Roy Smith <[EMAIL PROTECTED]> writes:
>
>>The "right" way to do this is:
>>
>>for line in file ("filename"):
>> whatever
>>
>>The file object returned by file() acts as an iterator. Each time through
>>the loop, another line is read and returned (I'm sure there is some
>>b
Roy Smith <[EMAIL PROTECTED]> writes:
> The "right" way to do this is:
>
> for line in file ("filename"):
>whatever
>
> The file object returned by file() acts as an iterator. Each time through
> the loop, another line is read and returned (I'm sure there is some
> block-level buffering goin
Jp Calderone <[EMAIL PROTECTED]> wrote:
> Yes, but you need to do it like this:
>
> fileIter = iter(big_file)
> for line in fileIter:
> line_after = fileIter.next()
That's better than the solution I posted.
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On Sun, 3 Jul 2005 23:52:12 +0200, martian <[EMAIL PROTECTED]> wrote:
>Hi,
>
>I've a couple of questions regarding the processing of a big text file
>(16MB).
>
>1) how does python handle:
>
>> for line in big_file:
>
>is big_file all read into memory or one line is read at a time or a buffer
>is us
"martian" <[EMAIL PROTECTED]> wrote:
> 1) how does python handle:
>
> > for line in big_file:
>
> is big_file all read into memory or one line is read at a time or a buffer
> is used or ...?
The "right" way to do this is:
for line in file ("filename"):
whatever
The file object returned by f
Hi,
I've a couple of questions regarding the processing of a big text file
(16MB).
1) how does python handle:
> for line in big_file:
is big_file all read into memory or one line is read at a time or a buffer
is used or ...?
2) is it possible to advance lines within the loop? The following doe
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