Assignment via `import`

In the following example MyPy complain about local import and does not recognize it as assignment:

from typing import Callable, Optional

def f(callable: Optional[Callable[[float], float]]) -> None:
    if callable is None:
        from math import sqrt as callable  # line 5

    callable(1.5)  # line 7

Output:

t3.py:5: error: Name "callable" already defined on line 3
t3.py:7: error: "None" not callable
Found 2 errors in 1 file (checked 1 source file)

It is not recognized as assignment even for global import:

from typing import Callable, Optional

callable: Optional[Callable[[float], float]] = None
if callable is None:
    from math import sqrt as callable

callable(1.5)  # line 7

Output:

t32.py:7: error: "None" not callable
Found 1 error in 1 file (checked 1 source file)

mypy 0.950 (compiled: yes)
Python 3.9.12

Start by running the two inline Python reproductions with mypy 0.950 and compare the reported errors for local and global imports. Trace how these import aliases are analyzed, then add regression coverage showing the callable is recognized after the conditional import and that the erroneous diagnostics are gone.