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#!/usr/bin/env python3

""" Compare the output of two codecs.

Licensed to PSF under a Contributor Agreement.

"""

import sys

def compare_codecs(encoding1, encoding2):

print('Comparing encoding/decoding of %r and %r' % (encoding1, encoding2))

mismatch = 0

# Check encoding

for i in range(sys.maxunicode+1):

u = chr(i)

try:

c1 = u.encode(encoding1)

except UnicodeError as reason:

c1 = '<undefined>'

try:

c2 = u.encode(encoding2)

except UnicodeError as reason:

c2 = '<undefined>'

if c1 != c2:

print(' * encoding mismatch for 0x%04X: %-14r != %r' % \

(i, c1, c2))

mismatch += 1

# Check decoding

for i in range(256):

c = bytes([i])

try:

u1 = c.decode(encoding1)

except UnicodeError:

u1 = '<undefined>'

try:

u2 = c.decode(encoding2)

except UnicodeError:

u2 = '<undefined>'

if u1 != u2:

print(' * decoding mismatch for 0x%04X: %-14r != %r' % \

(i, u1, u2))

mismatch += 1

if mismatch:

print()

print('Found %i mismatches' % mismatch)

else:

print('-> Codecs are identical.')

if __name__ == '__main__':

compare_codecs(sys.argv[1], sys.argv[2])

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comparecodecs.py

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