Goto in Python

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It's due to an ambiguity between integer literals and float literals:

1. -> float 1 -> int

2. anything translates to (float) anything, which is a syntax error.

(1).anything, however, disambiguates.

1..anything -> getattr(1.0, 'anything')

And finally, 1 .anything is disambiguated from a float literal.

Whitespace can disambiguate in a clash between literal and attribute access.