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Python | Add trailing Zeros to string
  • Last Updated : 20 May, 2019

Sometimes, we wish to manipulate a string in such a way in which we might need to add additional zeros at the end of string; in case of filling the missing bits or any other specific requirement. The solution to this kind of problems is always handy and is good if one has knowledge of it. Let’s discuss certain ways in which this can be solved.

Method #1 : Using ljust()

This task can be performed using the simple inbuilt string function of ljust in which we just need to pass no. of zeros required and the element to right pad, in this case being zero.




# Python3 code to demonstrate
# adding trailing zeros
# using ljust()
  
# initializing string 
test_string = 'GFG'
  
# printing original string 
print("The original string : " + str(test_string))
  
# No. of zeros required
N = 4
  
# using ljust()
# adding trailing zero
res = test_string.ljust(N + len(test_string), '0')
  
# print result
print("The string after adding trailing zeros : " + str(res))


Output :

The original string : GFG
The string after adding trailing zeros : GFG0000

 



Method #2 : Using format()

String formatting using the format function can be used to perform this task easily, we just mention the number of elements total, element needed to pad, and direction of padding, in this case right.




# Python3 code to demonstrate
# adding trailing zeros
# using format()
  
# initializing string 
test_string = 'GFG'
  
# printing original string 
print("The original string : " + str(test_string))
  
# No. of zeros required
N = 4
  
# using format()
# adding trailing zero
# N for number of elememts, '0' for Zero, and '<' for trailing
temp = '{:<07}'
res = temp.format(test_string)
  
# print result
print("The string after adding trailing zeros : " + str(res))


Output :

The original string : GFG
The string after adding trailing zeros : GFG0000

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