擅长:python、mysql、java
<p>这似乎有效:</p>
<pre class="lang-py prettyprint-override"><code>from __future__ import annotations
from typing import Optional, overload, Literal
class Animal:
# using defaults
@overload
def foo(self, bar=..., inplace: Literal[False]=...) -> Animal: ...
# using inplace = True
# with bar
@overload
def foo(self, bar, inplace: Literal[True]) -> None: ...
# without bar
@overload
def foo(self, *, inplace: Literal[True]) -> None: ...
# with bool
@overload
def foo(self, bar=..., inplace: bool=...) -> Optional[Animal]: ...
def foo(
self, bar=None, inplace = False
):
...
reveal_type(Animal().foo(bar='a'))
reveal_type(Animal().foo(bar='a', inplace=True))
reveal_type(Animal().foo(bar='a', inplace=False))
reveal_type(Animal().foo(inplace=True))
reveal_type(Animal().foo(inplace=False))
reveal_type(Animal().foo())
inplace: bool
reveal_type(Animal().foo(bar='a', inplace=inplace))
reveal_type(Animal().foo(inplace=inplace))
</code></pre>
<p>很多过载,但这可能是不可避免的</p>