Type hints when unpacking a tuple?

Question

Is it possible to use type hinting when unpacking a tuple? I want to do this, but it results in a SyntaxError:

from typing import Tuple

t: Tuple[int, int] = (1, 2)
a: int, b: int = t
#     ^ SyntaxError: invalid syntax

Solution

According to PEP-0526, you should annotate the types first, then do the unpacking

a: int
b: int
a, b = t

Comments

[tribbloid]

Still triggers a warning: Redeclared 'a' defined above without usage

[joel]

@tribbloid I get that when I have indeed already defined a earlier, are you certain you haven't done that?

[normanius]

@tribbloid This is if the variable is redefined, like a = int(a) or other re-assignments. If you work with mypy for static type checking, use --allow-redefinition to avoid the warning

[g.pickardou]

this is sad, how on earth <variable>:<typehint> can not use any syntactical context, where variable assignment is legal...