Pandas: Count number of columns of a DataFrame

Last update on April 03 2025 13:11:25 (UTC/GMT +8 hours)

57. Count Number of Columns

Write a Pandas program to count number of columns of a DataFrame.

Sample Solution :

Python Code :

import pandas as pd
d = {'col1': [1, 2, 3, 4, 7], 'col2': [4, 5, 6, 9, 5], 'col3': [7, 8, 12, 1, 11]}
df = pd.DataFrame(data=d)
print("Original DataFrame")
print(df)
print("\nNumber of columns:")
print(len(df.columns))

Sample Output:

Original DataFrame
   col1  col2  col3
0     1     4     7
1     2     5     8
2     3     6    12
3     4     9     1
4     7     5    11

Number of columns:
3   

For more Practice: Solve these Related Problems:

• Write a Pandas program to count the total number of columns in a DataFrame and then print the names of those columns.
• Write a Pandas program to calculate the number of columns and then verify it by comparing with the shape of the DataFrame.
• Write a Pandas program to count columns that are of numeric data types and then output their count separately.
• Write a Pandas program to determine the number of columns, then dynamically create a new DataFrame with double that number of columns.

Python-Pandas Code Editor:

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