为什么 str.translate 在 Python 3 中不起作用？
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时间：2020-08-19 00:15:07 来源:igfitidea点击:
Why doesn't str.translate work in Python 3?
提问by fhucho
Why does 'a'.translate({'a':'b'})return 'a'instead of 'b'? I'm using Python 3.
为什么'a'.translate({'a':'b'})返回'a'而不是'b'？我正在使用 Python 3。
回答by jamylak
The keys used are the ordinals of the characters, not the characters themselves:
使用的键是字符的序数，而不是字符本身：
'a'.translate({ord('a'): 'b'})
It's easier to use str.maketrans
使用起来更方便 str.maketrans
>>> 'a'.translate(str.maketrans('a', 'b'))
'b'
>>> help(str.translate)
Help on method_descriptor:
translate(...)
S.translate(table) -> str
Return a copy of the string S, where all characters have been mapped
through the given translation table, which must be a mapping of
Unicode ordinals to Unicode ordinals, strings, or None.
Unmapped characters are left untouched. Characters mapped to None
are deleted.
