determining file type

[Ritesh Raj Sarraf]

Hi,

I have a funtion named unzipper() which does the work of unzipping the
files.

Is there a way I can identify what is the type of the file which'll be
passed to unzipper().
If yes, I'll be able to make out if it's a zip file or a tar or a bz2
file.

Thanks,
Ritesh

 

[Maric Michaud]

Le Mercredi 14 Juin 2006 11:22, Ritesh Raj Sarraf a écrit :

Hi,

I have a funtion named unzipper() which does the work of unzipping the
files.

Is there a way I can identify what is the type of the file which'll be
passed to unzipper().
If yes, I'll be able to make out if it's a zip file or a tar or a bz2
file.

Under Linux you can use the file command in a pipe.
In all cases, you use the "magic" repository of the file command directly like
this (I found the '\xff\xd8' for jpeg in /usr/share/file/magic.mime on my
debian)

In [69]: f = file ('samurai_tux.jpg')

In [70]: s = f.read(2)

In [71]: s == '\xff\xd8'
Out[71]: True

Thanks,
Ritesh

--
_____________

Maric Michaud
_____________

Aristote - www.aristote.info
3 place des tapis
69004 Lyon
Tel: +33 426 880 097

 

[Ritesh Raj Sarraf]

But isn't there any library function ?
Something like
XX.filetype(name)
Directory
File-Tar
File-Zip
File-MPEG

Ritesh

Le Mercredi 14 Juin 2006 11:22, Ritesh Raj Sarraf a écrit :

Hi,

I have a funtion named unzipper() which does the work of unzipping the
files.

Is there a way I can identify what is the type of the file which'll be
passed to unzipper().
If yes, I'll be able to make out if it's a zip file or a tar or a bz2
file.

Under Linux you can use the file command in a pipe.
In all cases, you use the "magic" repository of the file command directly like
this (I found the '\xff\xd8' for jpeg in /usr/share/file/magic.mime on my
debian)

In [69]: f = file ('samurai_tux.jpg')

In [70]: s = f.read(2)

In [71]: s == '\xff\xd8'
Out[71]: True

Thanks,
Ritesh

--
_____________

Maric Michaud
_____________

Aristote - www.aristote.info
3 place des tapis
69004 Lyon
Tel: +33 426 880 097

 

[Ritesh Raj Sarraf]

Also,
f = file ('some_file.jpg')

throws an error.
"str object is not callable"

Ritesh

Le Mercredi 14 Juin 2006 11:22, Ritesh Raj Sarraf a écrit :

Hi,

I have a funtion named unzipper() which does the work of unzipping the
files.

Is there a way I can identify what is the type of the file which'll be
passed to unzipper().
If yes, I'll be able to make out if it's a zip file or a tar or a bz2
file.

Under Linux you can use the file command in a pipe.
In all cases, you use the "magic" repository of the file command directly like
this (I found the '\xff\xd8' for jpeg in /usr/share/file/magic.mime on my
debian)

In [69]: f = file ('samurai_tux.jpg')

In [70]: s = f.read(2)

In [71]: s == '\xff\xd8'
Out[71]: True

Thanks,
Ritesh

--
_____________

Maric Michaud
_____________

Aristote - www.aristote.info
3 place des tapis
69004 Lyon
Tel: +33 426 880 097

 

[Diez B. Roggisch]

Also,
f = file ('some_file.jpg')

throws an error.
"str object is not callable"

I bet you have rebound "file" to a string, like this:

file = "some name"


And PLEASE don't top-quote:

http://www.redballoon.net/~snorwood/quote-rant.shtml


Diez

 

[Maric Michaud]

Le Mercredi 14 Juin 2006 12:41, Ritesh Raj Sarraf a écrit :

Also,
f = file ('some_file.jpg')

throws an error.
"str object is not callable"

stange, did you define a function named file ?
You can use open instead.

--
_____________

Maric Michaud
_____________

Aristote - www.aristote.info
3 place des tapis
69004 Lyon
Tel: +33 426 880 097

 

[Marc 'BlackJack' Rintsch]

Also,
f = file ('some_file.jpg')

throws an error.
"str object is not callable"

This happens if you rebind names of builtins. In this case to a string.
Don't do that!

In [5]:file
Out[5]:<type 'file'>

In [6]:file = 'foo.txt'

In [7]:file
Out[7]:'foo.txt'

In [8]:file('x')
---------------------------------------------------------------------------
exceptions.TypeError Traceback (most recent call last)

/home/bj/<ipython console>

TypeError: 'str' object is not callable


Ciao,
Marc 'BlackJack' Rintsch

 

[Sion Arrowsmith]

Also,
f =3D file ('some_file.jpg')

throws an error.
"str object is not callable"

You know all the times people say in this group "Don't use list
or str or file[HINT] or anything else that shadows a built in as
a variable name"? Now you know why.

 

[utabintarbo]

http://www.demonseed.net/~jp/code/magic.py