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Pandas: Check whether a given column is present in a DataFrame or not

Pandas: DataFrame Exercise-46 with Solution

Write a Pandas program to check whether a given column is present in a DataFrame or not.

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)
if 'col4' in df.columns:
  print("Col4 is present in DataFrame.")
else:
  print("Col4 is not present in DataFrame.")
if 'col1' in df.columns:
  print("Col1 is present in DataFrame.")
else:
  print("Col1 is not present in DataFrame.")

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
Col4 is not present in DataFrame.
Col1 is present in DataFrame.

Python-Pandas Code Editor:

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Previous: Write a Pandas program to find the row for where the value of a given column is maximal.
Next: Write a Pandas program to get the specified  row value of a given DataFrame.

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

  • The os and os.path modules.
  • The __file__ constant
  • os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
  • os.path.dirname(path) (returns "the directory name of pathname path")
  • os.getcwd() (returns "a string representing the current working directory")
  • os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m