add empty column to dataframe pandas

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Benjy
23 Apr 2019
1>>> import numpy as np
2>>> import pandas as pd
3>>> df = pd.DataFrame({"A": [1,2,3], "B": [2,3,4]})
4>>> df
5   A  B
60  1  2
71  2  3
82  3  4
9>>> df["C"] = ""
10>>> df["D"] = np.nan
11>>> df
12   A  B C   D
130  1  2   NaN
141  2  3   NaN
152  3  4   NaN
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