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Date: Thu, 6 Sep 2012 13:26:32 -0700 (PDT)
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Subject: Re: Function for examine content of directory
From: Tigerstyle <laddosingh@gmail.com>
Cc: python-list@python.org
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Xref: csiph.com comp.lang.python:28636

Thanks, just what I was looking for :-)

T

kl. 17:20:27 UTC+2 torsdag 6. september 2012 skrev MRAB f=F8lgende:
> On 06/09/2012 15:56, Tigerstyle wrote:
>=20
> > Hi guys,
>=20
> >
>=20
> > I'm trying to write a module containing a function to examine the conte=
nts of the current working directory and print out a count of how many file=
s have each extension (".txt", ".doc", etc.)
>=20
> >
>=20
> > This is the code so far:
>=20
> > --
>=20
> > import os
>=20
> >
>=20
> > path =3D "v:\\workspace\\Python2_Homework03\\src\\"
>=20
> > dirs =3D os.listdir( path )
>=20
> > filenames =3D {"this.txt", "that.txt", "the_other.txt","this.doc","that=
.doc","this.pdf","first.txt","that.pdf"}
>=20
> > extensions =3D []
>=20
> > for filename in filenames:
>=20
> >      f =3D open(filename, "w")
>=20
> >      f.write("Some text\n")
>=20
> >      f.close()
>=20
> >      name , ext =3D os.path.splitext(f.name)
>=20
> >      extensions.append(ext)
>=20
> >
>=20
> > # This would print all the files and directories
>=20
> > for file in dirs:
>=20
> >      print(file)
>=20
> >
>=20
> > for ext in extensions:
>=20
> >      print("Count for %s: " %ext, extensions.count(ext))
>=20
> >
>=20
> > --
>=20
> >
>=20
> > When I'm trying to get the module to print how many files each extensio=
n has, it prints the count of each ext multiple times for each extension ty=
pe. Like this:
>=20
> >
>=20
> > this.pdf
>=20
> > the_other.txt
>=20
> > this.doc
>=20
> > that.txt
>=20
> > this.txt
>=20
> > that.pdf
>=20
> > first.txt
>=20
> > that.doc
>=20
> > Count for .pdf:  2
>=20
> > Count for .txt:  4
>=20
> > Count for .doc:  2
>=20
> > Count for .txt:  4
>=20
> > Count for .txt:  4
>=20
> > Count for .pdf:  2
>=20
> > Count for .txt:  4
>=20
> > Count for .doc:  2
>=20
> >
>=20
> That's because each extension can occur multiple times in the list.
>=20
>=20
>=20
> Try the Counter class:
>=20
>=20
>=20
> from collections import Counter
>=20
>=20
>=20
> for ext, count in Counter(extensions).items():
>=20
>      print("Count for %s: " % ext, count)