ref: ff14019cd4713097c5e9e972fa573f7fc96f15b4
dir: /sys/src/cmd/python/Tools/unicode/listcodecs.py/
""" List all available codec modules.
(c) Copyright 2005, Marc-Andre Lemburg (mal@lemburg.com).
    Licensed to PSF under a Contributor Agreement.
"""
import os, codecs, encodings
_debug = 0
def listcodecs(dir):
    names = []
    for filename in os.listdir(dir):
        if filename[-3:] != '.py':
            continue
        name = filename[:-3]
        # Check whether we've found a true codec
        try:
            codecs.lookup(name)
        except LookupError:
            # Codec not found
            continue
        except Exception, reason:
            # Probably an error from importing the codec; still it's
            # a valid code name
            if _debug:
                print '* problem importing codec %r: %s' % \
                      (name, reason)
        names.append(name)
    return names
if __name__ == '__main__':
    names = listcodecs(encodings.__path__[0])
    names.sort()
    print 'all_codecs = ['
    for name in names:
        print '    %r,' % name
    print ']'