[Python] tarfile.ReadError: file could not be opened successfully

I have the following piece of code to open a .tgz file, but I'm getting tarfile.ReadError: file could not be opened successfully.

fp = tarfile.open('file.tgz', 'r')
print fp.list()
fp.close()


I can extract this archive using "tar -xvzf file.tgz." Apparently it has something to do with the way the file was created because when I compare two different .tgz files using file, I see a difference; file2.tgz works with this piece of code.

$ file file.tgz
file.tgz: gzip compressed data, from FAT filesystem (MS-DOS, OS/2, NT)

$ file file2.tgz
file2.tgz: gzip compressed data, was "", last modified: Tue Aug 19 11:16:10 2014, max compression


Any ideas why this is happening or how I can modify file.tgz so that it works with tarfile?

Note: I'm using Python 2.7.5.

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