Converting column names to lowercase using str.lower() in Pandas

Last update on April 09 2025 12:54:40 (UTC/GMT +8 hours)

11. Reordering and Splitting Columns

Write a Pandas program to change column names to lowercase.

In this exercise, we have changed the column names of a DataFrame to lowercase using str.lower().

Sample Solution :

Code :

import pandas as pd

# Create a sample DataFrame with uppercase column names
df = pd.DataFrame({
    'Name': ['Selena', 'Annabel', 'Caeso'],
    'Age': [25, 30, 22],
    'Salary': [50000, 60000, 70000]
})

# Convert all column names to lowercase
df.columns = df.columns.str.lower()

# Output the result
print(df)

Output:

      name  age  salary
0   Selena   25   50000
1  Annabel   30   60000
2    Caeso   22   70000

Explanation:

• Created a DataFrame with uppercase column names.
• Used str.lower() to convert all column names to lowercase.
• Outputted the DataFrame with the new lowercase column names.

For more Practice: Solve these Related Problems:

• Write a Pandas program to reorder columns in a DataFrame based on a specified custom order.
• Write a Pandas program to split a full name column into first, middle, and last name columns.
• Write a Pandas program to move a specific column to the beginning of the DataFrame and reorder the rest alphabetically.
• Write a Pandas program to split a column containing dates into separate day, month, and year columns.

Python-Pandas Code Editor:

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