In Python, use md5sum to check the same file code share in the directory _python

Copy Code code as follows:

"" "This module contains the code from
The I-Am Python by Allen B. Downey

Http://thinkpython.com

Copyright Downey Allen B.
License:gnu GPLv3 http://www.gnu.org/licenses/gpl.html

"""

Import OS

def walk (dirname):
"" "finds the names of all files in DirName and its subdirectories.

dirname:string Name of directory
"""
names = []
For name in Os.listdir (dirname):
Path = Os.path.join (dirname, name)

If Os.path.isfile (path):
Names.append (PATH)
Else
Names.extend (Walk (Path))
return names

def compute_checksum (filename):
"" "computes the MD5 checksum of the contents of a file.

Filename:string
"""
cmd = ' md5sum ' + filename
return pipe (CMD)

def check_diff (name1, name2):
"" "computes the difference between the contents of two files.

Name1, name2:string filenames
"""
cmd = ' diff%s%s '% (name1, name2)
return pipe (CMD)

def pipe (CMD):
"" "runs a command in a subprocess.

Cmd:string Unix Command

Returns (res, stat), the output of the subprocess and the exit status.
"""
fp = Os.popen (cmd)
res = Fp.read ()
Stat = Fp.close ()
Assert stat is None
return RES, stat

def compute_checksums (dirname, suffix):
"" "Computes checksums for all files with the given suffix.

dirname:string name of directory to search
suffix:string suffix to match

Returns:map from checksum to list of files and that checksum
"""
Names = Walk (dirname)

D = {}
For name in Names:
If Name.endswith (suffix):
RES, stat = compute_checksum (name)
Checksum, _ = Res.split ()

If checksum in D:
D[checksum].append (name)
Else
D[checksum] = [name]

Return D

def check_pairs (names):
"" "Checks whether any in a list of files differs from the others.

Names:list of string filenames
"""
For name1 in Names:
For name2 in Names:
If name1 < name2:
RES, stat = Check_diff (name1, name2)
If Res:
Return False
Return True

def print_duplicates (d):
"" "Checks for duplicate files.

Reports any files with the same checksum and checks whether they
Are, in fact, identical.

D:map from checksum to list of files and that checksum
"""
For key, names in D.iteritems ():
If Len (names) > 1:
print ' The following files have the same checksum: '
For name in Names:
Print Name

If Check_pairs (names):
print ' and they are identical. '

if __name__ = = ' __main__ ':
D = compute_checksums (dirname= '. ', suffix= '. Py ')
Print_duplicates (d)