Reading a file using a UNC - help!

[johnzenger at gmail.com]

You should use os.path.exists to test if a file exists.  Your
exception-catching structure is not necessary.

Also, if the file you are reading from contains proper Windows
filenames, it is not necessary to replace \ with \\ and so forth.  The
\ acts as an escape character only when it is in Python source code,
not when it is in a string read from the real world.

Also, because you wisely use "for x in inputfiles:" it is not necessary
to search for and replace newlines.

richard.kessler at matteicos.com wrote:
> I have the simplest need...to read a file full of file names(unc) and
> then check to see if each of these files exists.  I tried with the
> following program, but always get file not found, even when it is
> there. If I type in the file name as a literal it works...
>
> Little program:
>
> #This module checks for file existence
> import string
> import sys
>
> def MainProcess():
>
>     fileList = "c:\a_list_of_filenames.txt"
>     inputFiles = open(fileList,"r")
>
>     cnt = 0
>     cntNotFound = 0
>
>     for x in inputFiles:
>         cnt = cnt + 1
>         try:
>             x = x.replace("\\","\\\\")
>             x = x.replace("\n","")
>             open(x,"rb")
>             #open('\\\\myserver\\myshare\\myfile.dat',"r")  #works when
> hard coded like this
>         except IOError, (errno, strerror):
>             print "I/O error(%s): %s" % (errno, strerror)
>             cntNotFound = cntNotFound + 1
>             print x + " Not Found"
>         except ValueError, (errno,strerror):
>             print "Some other error! " + str(errno) + " " + strerror
>         else:
>             print "Found " + x
>
>     print str(cnt) + " total..."
>     print str(cntNotFound) + " not found..."
>
> if __name__ == '__main__':
>     MainProcess()
>
> Many thanks to anyone in advance to can tell me what I am doing wrong!
> Platform is XP with PythonWin.
> 
> Richard Kessler
> richard.kessler at matteicos.com