Both of those seem to work:
Aragorn:Tools david$ which python
/usr/bin/python
Aragorn:Tools david$ ls
kindle2sn.txt kindlefix.py kindlepid.old prc.py
kindlefix kindlepid kindlepid.py readme.txt
Aragorn:Tools david$ ./kindlepid.py
Mobipocket PID calculator for Amazon Kindle. Copyright (c) 2007 Igor Skochinsky <skochinsky@mail.ru>
Usage: kindlepid.py <Kindle Serial Number>
Aragorn:Tools david$ python kindlepid.py
Mobipocket PID calculator for Amazon Kindle. Copyright (c) 2007 Igor Skochinsky <skochinsky@mail.ru>
Usage: kindlepid.py <Kindle Serial Number>
Aragorn:Tools david$
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