4 ms·
import List?? At least this works: def sum_and_stringify(nums: list) -> str:
by singularity2001 10y ago
import List??
At least this works:
def sum_and_stringify(nums: list) -> str:
- dcre 10y agoThe built-in constructor is `list`, not `List`.
- singularity2001 10y agoThanks for all the help guys! by the way I took the example from the mypy page def sum_and_stringify(nums: list[int]) -> str: TypeError: 'type' object is not subscriptable so either just list or List[int] with import, got it. A classical case of 'critical line missing from example code' (as perfectioned by Bjarne Stroustrup back when)
- ddfisher 10y agoYeah, you need to write `from typing import List` to get the generic List class that you can parameterize with an item type. As you pointed out, you can use the builtin lowercase-l list without importing anything, but that doesn't allow you to specify the item type.
- ddorian43 10y agoNo. Try: from typing import List, TYPE_CHECKING How I found it: quick google search for "mypy validate list"