8000 float not understood as numbers.Number · Issue #7375 · python/mypy · GitHub
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jordan-schneider opened this issue Aug 20, 2019 · 1 comment
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float not understood as numbers.Number #7375

jordan-schneider opened this issue Aug 20, 2019 · 1 comment

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@jordan-schneider
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jordan-schneider commented Aug 20, 2019 •
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Please provide more information to help us understand the issue:

  • Are you reporting a bug, or opening a feature request? Reporting a bug
  • Please insert below the code you are checking with mypy,
    or a mock-up repro if the source is private. We would appreciate
    if you try to simplify your case to a minimal repro.
import numbers

a: float = 5.0
print(isinstance(a, numbers.Number))  # True

def f(a: float) -> numbers.Number:
    return a  # Incompatible return value type (got "float", expected "Number")
  • What is the actual behavior/output?
    Mypy reports the error "Incompatible return value type (got "float", expected "Number")".
  • What is the behavior/output you expect?
    I expect mypy to report no errors.
  • What are the versions of mypy and Python you are using?
    mypy 0.660
    Python 3.6.8
    Do you see the same issue after installing mypy from Git master?
    Yes.
  • What are the mypy flags you are using? (For example --strict-optional)
    None.

I'm slightly unclear if this is really a bug because I don't really understand what numbers is doing but isinstance() returns true, so I would expect the above code to be fine.

Thanks!
@ilevkivskyi
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This a (yet another) duplicate of #3186

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