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Pandas: Add leading zeros to the integer column in a pandas series and makes the length of the field to 8 digit

Pandas: String and Regular Expression Exercise-3 with Solution

Write a Pandas program to add leading zeros to the integer column in a pandas series and makes the length of the field to 8 digit.

Sample Solution:

Python Code :

import pandas as pd
nums = {'amount': [10, 250, 3000, 40000, 500000]}
print("Original dataframe:")
df = pd.DataFrame(nums)
print(df)
print("\nAdd leading zeros:")
df['amount'] = df['amount'].apply(lambda x: '{0:0>8}'.format(x))
print(df)

Sample Output:

Original dataframe:
   amount
0      10
1     250
2    3000
3   40000
4  500000

Add leading zeros:
     amount
0  00000010
1  00000250
2  00003000
3  00040000
4  00500000

Python Code Editor:


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Previous: Write a Pandas program to remove whitespaces, left sided whitespaces and right sided whitespaces of the string values of a given pandas series.
Next: Write a Pandas program to add leading zeros to the character column in a pandas series and makes the length of the field to 8 digit.

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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