>>> f=open(r'c:\Test.txt','r')
Traceback (most recent call last):
File "<interactive input>", line 1, in ?
IOError: [Errno 2] No such file or directory: 'c:\\Test.txt'
>>> f=open(r'c:\\Test.txt','r')
Traceback (most recent call last):
File "<interactive input>", line 1, in ?
IOError: [Errno 2] No such file or directory: 'c:\\\\Test.txt'
>>> f=open(r'C:/Test.txt','r')
Traceback (most recent call last):
File "<interactive input>", line 1, in ?
IOError: [Errno 2] No such file or directory: 'C:/Test.txt'
>>> f=open('c:\\Test.txt','r')
Traceback (most recent call last):
File "<interactive input>", line 1, in ?
IOError: [Errno 2] No such file or directory: 'c:\\Test.txt'
Now with all the explanations of r, slash, double slash, and backslash, I can't really figure out what's going on.....
Any hints is much appreciated.
Thanks,
Andy
On 1/17/06, Python <
[EMAIL PROTECTED]> wrote:
(replying back to the list also)
On Tue, 2006-01-17 at 10:03 -0800, andy senoaji wrote:
> Sorry for the inconsistent error message. I think I may pasted
> incorretcly. I am now in a different machine, and have tested Paul's
> suggestion, and it worked. But would the 'r' tackles the escape
> sequence? I may misunderstood the intent of the r' switcher here.
>
> Thanks,
>
> Andy
> f = open(r'C:\Test.txt', 'r')
> This looks correct!
r'C:\Test.txt' is a raw string. The r'strings' ignore the special use
of the backslash character except that a raw string must not end with a
backslash. This is strictly a convenience when entering a string.
Since Windows uses backslash as the path separator, it helps ease the
pain when constructing file paths in Windows. Raw strings are also very
helpful when writing regular _expression_ strings which often need to have
backspace characters.
Internally, a raw string is the same as any other Python string. When
Python displays a raw string, Python will show the backslashes as \\
(doubled) because that is usually how you need to enter a backslash.
Python does not track (as far as I know) that the string originated as a
raw string.
In regular strings, the backslash is used to mark characters that need
special handling. '\t' is a tab character. '\n' is a newline (linefeed).
'\r' is a carriage-return (Enter Key).
http://docs.python.org/ref/strings.html
provides the detailed documentation about how strings work and the
definitive list of backspace usages.
>
> On 1/17/06, Python <[EMAIL PROTECTED]> wrote:
> On Tue, 2006-01-17 at 09:11 -0800, andy senoaji wrote:
> > I am starting to pull my hair here. There were some postings
> in the
> > past, similar to my problem, but the response was not clear
> enough.
> > Sorry if you thingk I am reposting this.
> >
> > I am trying to run (on an XP box) a simple open file using
> this:
> > f = open(r'C:\Test.txt', 'r')
> This looks correct!
>
> >
> > but it keeps give me nagging error of:
> > Traceback (most recent call last):
> > File "<pyshell#0>", line 1, in -toplevel-
> > f = open('Test.txt', 'r')
> This is not the same is the line above!
>
> > IOError: [Errno 2] No such file or directory: 'C:\Test.txt'
> And this does not match *either* of the lines above.
>
> If you really use that first line, I would expect it to
> work. If you
> get an error, from that line, the file will be identified as:
> 'C:\\Test.txt'
>
> >
> > I know for sure that the file is there, I even put copies of
> the files
> > here and there, just to guess how python does the file
> search, but it
> > keeps giving me 'No such file or directory'. i also tried
> variation of
> > the file location string, but gave me a variation of
> errors :). Any
> > suggestions?
> >
> > Furthermore, how does Python assumes the search path? Will
> it look
> > at /LIB first? How does it knows drive lettering, network
> mapping etc?
> > Is there a configuration settings that I can tweak in my
> Python? FYI I
> > am using Activestate's.
> >
> >
> > Thx,
> >
> > Andy
> > _______________________________________________
> > Tutor maillist - Tutor@python.org
> > http://mail.python.org/mailman/listinfo/tutor
> --
> Lloyd Kvam
> Venix Corp
>
--
Lloyd Kvam
Venix Corp
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