Serhiy Storchaka added the comment:
Inconsistency is a weak argument. It itself is not enough to add a new feature.
str.translate() accepts a mapping instead of a string (as it would be for
consistency with bytes.translate()) because it would be inconvenient to provide
a 1114112-character string. str.maketrans() just compile a mapping in the
optimized representation, because using a general mapping is not very efficient.
A bytes object of length 256 already is the most efficient representation of
the translation table for bytes. And you can create it from a mapping in Python:
def mymaketrans(mapping):
table = bytearray(range(256))
for x, y in mapping.items():
table[x] = y
return table
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<https://bugs.python.org/issue31594>
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