Wednesday, November 29, 2017

UnicodeDecode SyntaxError

When executing a bytecode for the '+' operation, an invalid byte will raise UnicodeDecodeError.  However, when concatenating adjacent string and unicode constants, it will be a SyntaxError.  (I guess because there is not byte-code executing this is happening at compile time.)

>>> u'a' + '\xff'
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
UnicodeDecodeError: 'ascii' codec can't decode byte 0xff in position 0: ordinal not in range(128)


>>> u'a' '\xff'
  File "<stdin>", line 1
SyntaxError: (unicode error) 'ascii' codec can't decode byte 0xff in position 0: ordinal not in range(128)

10 comments:

  1. This is because the concatenation of adjacent strings is a preprocessor operation

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