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CBSE Class 12 Informatics Practices Question 131 of 167

Python Pandas — I — Question 21

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21
Question

Question 15(d)

From the DataFrames created in previous question, write code to add an empty column 'x' to all DataFrames.

Solution
import pandas as pd
d = {'one' : pd.Series([1., 2., 3.], index = ['a', 'b', 'c']), 'two' : pd.Series([1., 2., 3., 4.], index = ['a', 'b', 'c', 'd'])} 
df = pd.DataFrame(d)
df1 = pd.DataFrame(d, index = ['d', 'b', 'a'])
df2 = pd.DataFrame(d, index = ['d', 'a'], columns = ['two', 'three'])
df['x'] = None
df1['x'] = None
df2['x'] = None
print(df)
print(df1)
print(df2)
Output
   one  two     x
a  1.0  1.0  None
b  2.0  2.0  None
c  3.0  3.0  None
d  NaN  4.0  None
   one  two     x
d  NaN  4.0  None
b  2.0  2.0  None
a  1.0  1.0  None
   two three     x
d  4.0   NaN  None
a  1.0   NaN  None
Answer