/Python/Add empty column to dataframe pandas

Add empty column to dataframe pandas

>>> import numpy as np
>>> import pandas as pd
>>> df = pd.DataFrame({"A": [1,2,3], "B": [2,3,4]})
>>> df
   A  B
0  1  2
1  2  3
2  3  4
>>> df["C"] = ""
>>> df["D"] = np.nan
>>> df
   A  B C   D
0  1  2   NaN
1  2  3   NaN
2  3  4   NaN

Source: stackoverflow.com

Add data to empty column pandas

column_names = ["a", "b", "c"]

df = pd.DataFrame(columns = column_names)

df["a"] = [num for num in range(1, 5)]

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