1df["int"] = pd.Series([], dtype=object)
2df["str"] = pd.Series([], dtype=str)
3df.loc[0] = [0, "zero"]
4print(df)
5print()
6df.loc[1] = [1, None]
7print(df)
8
9 int str
100 0 zero
111 NaN NaN
12
13 int str
140 0 zero
151 1 None
16