I have two senarios that's bothering me:
1. infer return type of df.apply
As doc mentioned, the final return type is inferred from the return type of the applied function. But actually in VSCode it can't correctly infer type.
Right now I can only think of using pd.DataFrame to coerce. Is there any good advice?
2. intellisense in lambda functions
df.apply(lambda col: col.str.upper()) # col: Unknown
Do I have to write a def function for every apply in order to
hint types?
Also, it would really help if you have more practical examples for type hinting in pandas!