[Tutor] Open file error

[andy senoaji]

I'm back to my home machine, and ran again the open method, just to test my
sanity Here are the results:
>>> 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 <python at venix.com> 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 <python at venix.com> 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 at python.org
> >         > http://mail.python.org/mailman/listinfo/tutor
> >         --
> >         Lloyd Kvam
> >         Venix Corp
> >
>
> --
> Lloyd Kvam
> Venix Corp
>
>
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