create empty dataframe with column names code example

Example 1: blank dataframe with column names

df = pd.DataFrame(columns = column_names)

Example 2: create empty pandas dataframe

df = pd.DataFrame(columns=['a', 'b', 'c'])

Example 3: 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