Pandas: Find the index of a substring of DataFrame with beginning and end position

Last update on May 02 2025 12:51:48 (UTC/GMT +8 hours)

8. Find Substring with Positions

Write a Pandas program to find the index of a substring of DataFrame with beginning and end position.

Sample Solution:

Python Code :

import pandas as pd
df = pd.DataFrame({
    'name_code': ['c0001','1000c','b00c2', 'b2c02', 'c2222'],
    'date_of_birth ': ['12/05/2002','16/02/1999','25/09/1998','12/02/2022','15/09/1997'],
    'age': [18.5, 21.2, 22.5, 22, 23]
})
print("Original DataFrame:")
print(df)
print("\nIndex of a substring in a specified column of a dataframe:")
df['Index'] = list(map(lambda x: x.find('c', 0, 5), df['name_code']))
print(df)

Sample Output:

Original DataFrame:
  name_code date_of_birth    age
0     c0001     12/05/2002  18.5
1     1000c     16/02/1999  21.2
2     b00c2     25/09/1998  22.5
3     b2c02     12/02/2022  22.0
4     c2222     15/09/1997  23.0

Index of a substring in a specified column of a dataframe:
  name_code date_of_birth    age  Index
0     c0001     12/05/2002  18.5      0
1     1000c     16/02/1999  21.2      4
2     b00c2     25/09/1998  22.5      3
3     b2c02     12/02/2022  22.0      2
4     c2222     15/09/1997  23.0      0

For more Practice: Solve these Related Problems:

Write a Pandas program to determine the starting and ending positions of a substring within each element of a DataFrame column.
Write a Pandas program to extract both the beginning and ending indices of a specific substring from a column and output them as tuples.
Write a Pandas program to locate the positions (start and stop) of a substring in each row of a DataFrame column using regex.
Write a Pandas program to add two new columns representing the start and end positions of a specified substring found in a text column.

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Python Code Editor:

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