Pandas: Check whether only proper case or title case is present in a given column of a DataFrame

Last update on May 02 2025 12:52:28 (UTC/GMT +8 hours)

13. Check Title/Proper Case

Write a Pandas program to check whether only proper case or title case is present in a given column of a DataFrame.

Sample Solution:

Python Code :

import pandas as pd
df = pd.DataFrame({
    'company_code': ['Abcd','EFGF', 'Hhhh', 'abcd', 'EAWQaaa'],
    'date_of_sale ': ['12/05/2002','16/02/1999','25/09/1998','12/02/2022','15/09/1997'],
    'sale_amount': [12348.5, 233331.2, 22.5, 2566552.0, 23.0]})

print("Original DataFrame:")
print(df)
print("\nIs proper case or title case?")
df['company_code_is_title'] = list(map(lambda x: x.istitle(), df['company_code']))
print(df)

Sample Output:

Original DataFrame:
  company_code date_of_sale   sale_amount
0         Abcd    12/05/2002      12348.5
1         EFGF    16/02/1999     233331.2
2         Hhhh    25/09/1998         22.5
3         abcd    12/02/2022    2566552.0
4      EAWQaaa    15/09/1997         23.0

Is proper case or title case?
  company_code          ...          company_code_is_title
0         Abcd          ...                           True
1         EFGF          ...                          False
2         Hhhh          ...                           True
3         abcd          ...                          False
4      EAWQaaa          ...                          False

[5 rows x 4 columns]

For more Practice: Solve these Related Problems:

Write a Pandas program to check if every string in a DataFrame column is in title case using the istitle() method.
Write a Pandas program to create a boolean mask for a column that verifies if each value is in proper case.
Write a Pandas program to compare a column’s values with their title-cased versions and output mismatches.
Write a Pandas program to test each string in a column for title case and then count the number of properly cased entries.

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Python Code Editor:

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