Add NewType #1939
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Add NewType #1939
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docs/source/kinds_of_types.rst
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| However, at runtime, ``NewType('Derived', Base)`` will return a dummy function that | ||
| simply returns its argument. |
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Might want to show this by example, e.g.
def Derived(_x):
return _x
mypy/semanal.py
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| def get_newtype_declaration(self, s: AssignmentStmt) -> Optional[CallExpr]: | ||
| """Returns the Newtype() call statement if `s` is a newtype declaration | ||
| or None otherwise.""" |
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Can you make this docstring follow the PEP 257 recommendation?
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Done with the first round of code review. Hopefully it's as thorough as you requested! :-) |
docs/source/kinds_of_types.rst
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| .. code-block:: python | ||
| def Derived(_x: Base) -> Base: |
Member
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Since this is runtime, IMO it's better not to annotate it at all: just def Derived(_x): return _x.
Collaborator
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Thanks for writing such great documentation! |
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This pull request implements
NewTypeas described in PEP 484 and in issue #1284. It also adds a variety of test cases to verifyNewTypeworks correctly when used and misused and adds information about usingNewTypeto the mypy docs.This pull request resolves #1284.