Pandas: Check whether only lower case or upper case is present in a given column of a DataFrame

Last update on May 28 2022 13:02:31 (UTC/GMT +8 hours)

Pandas: String and Regular Expression Exercise-12 with Solution

Write a Pandas program to check whether only lower case or upper 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 lower (company_code)?")
df['company_code_ul_cases'] = list(map(lambda x: x.islower(), df['company_code']))
print(df)
print("\nIs Upper (company_code)?")
df['company_code_ul_cases'] = list(map(lambda x: x.isupper(), 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 lower (company_code)?
  company_code          ...          company_code_ul_cases
0         ABCD          ...                          False
1         EFGF          ...                          False
2         hhhh          ...                           True
3         abcd          ...                           True
4      EAWQaaa          ...                          False

[5 rows x 4 columns]

Is Upper (company_code)?
  company_code          ...          company_code_ul_cases
0         ABCD          ...                           True
1         EFGF          ...                           True
2         hhhh          ...                          False
3         abcd          ...                          False
4      EAWQaaa          ...                          False

[5 rows x 4 columns]

Python Code Editor:

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