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I'm new to python and experimenting with type hints, however they only seem to work in some instances. They seem to work as expected on the property return type, however when I try to assign an integer to a string value (i.e. self._my_string = 4), I get no issues reported.

class TypeHintTest(object):
    _my_string: str

    def __init__(self):
        self._my_string = 4  # no error

    @property
    def as_int(self) -> int:  
        return self._my_string  # Error : expected int got str

The resulting object then contains an int value (as expected).

I'm using pyCharm 2018.3.2 Community edition, the interpreter is 3.6

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The following question seems to be similar, but the solution of changing the constructor to def __init__(self) -> None does not change anything. Python: All type hints errors in subclass constructure seems ignored

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2 回答 2

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顾名思义，类型提示就是提示。如果为变量分配不同的类型，Python 不会引发错误。
然而，Pycharm应该说它需要另一种变量类型。

于 2019-01-03T10:50:15.490 回答
2

正如@FHTMitchell 指出它在 PyCharm 中的一个错误

请参阅错误跟踪器条目

于 2019-01-28T16:26:24.180 回答