Mark Dickinson added the comment:
> Mark, can you explain why the first example is valid syntax, but the second
> one is not:
Looks like Eric beat me to it! As he explained, it's the "maximal munch" rule
at work: the tokenizer matches as much as it can for each token.
You see similar effects with integer or float literals followed by a keyword
starting with 'e' (or 'j', but I don't think we have any of those).
>>> 3if 1else 2
File "<stdin>", line 1
3if 1else 2
^
SyntaxError: invalid token
>>> 3if 1 else 2
3
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<http://bugs.python.org/issue21979>
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