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>>> u"\u0411".encode("utf-8") '\xd0\x91' |
>>> u"a".encode("utf-8") 'a' |
Paradoxically, a UnicodeDecodeError happens when _encoding_. The cause of it seems to be the encoding-specific encode() functions that normally expect a parameter of type unicode. It appears that on seeing an str parameter, the encode() functions "up-convert" it into unicode before applying their own encoding. It also appears that the "up-conversion" makes no assumption of str parameter's encoding, assuming it to be ascii. Hence a decoding failure inside an encoder.
1 >>> u"a".encode("utf-8")
2 'a'
3 >>> u"\u0411".encode("utf-8")
4 '\xd0\x91'
5 >>> "a".encode("utf-8")
6 'a'
7 >>> "\xd0\x91".encode("utf-8")
8 Traceback (most recent call last):
9 File "<stdin>", line 1, in <module>
10 UnicodeDecodeError: 'ascii' codec can't decode byte 0xd0 in position 0: ordinal not in range(128)