Right to the point, here below is the sample code which will raise error in PyCharm:
list1 = [0] * 5
list1[0] = ''
list2 = [0 for n in range(5)]
list2[0] = ''
PyCharm then return an error on both line 2 and line 4 as below:
Unexpected type(s):(int, str)Possible type(s):(SupportsIndex, int)(slice, Iterable[int])
Running the code would not cause any error, but PyCharm keep raising the above message when I am coding.
Why PyCharm would give this error and how can I solve this with cleanest code?
In your case PyCharm sees you first line and thinks that the type of list is List[int]. I mean it is a list of integers.
You may tell that you list is not int-typed and can accept any value this way:
from typing import Any, List
list1: List[Any] = [0] * 5
list1[0] = ''
I used typing module just to explain the idea. Here is a simple way to announce that list1 is just a list of anything:
list1: list = [0] * 5
list1[0] = ''
Also consider to use as strict typing as possible. It may help you to prevent bugs.
If you need both strings and ints then use this:
from typing import List, Union
list1: List[Union[int, str]] = [0] * 5
# Starting from Python 3.10 you may use List[int|str] instead