Python | Repeat String till K

Last Updated : 29 May, 2019

Sometimes, while working with strings, we might encounter a use case in which we need to repeat our string to the size of K, even though the last string might not be complete, but has to stop as the size of string becomes K. The problem of repeating string K times, is comparatively simpler than this problem. Let’s discuss way outs we can perform to solve this problem.

Method #1 : Using list slicing and // operator

This task can be performed using the above tools. In this we just multiply the string till it becomes greater than or equal to K, and then just omit the slice of extra string using the list slicing method.

# Python3 code to demonstrate
# Repeat string till K
# using list slicing and // operator
  
# initializing string 
test_string = "GeeksforGeeks"
  
# initializing K 
K = 30
  
# printing original string 
print("The original string : " + str(test_string))
  
# using list slicing and // operator
# Repeat string till K
res = (test_string * (K//len(test_string)+ 1))[:K]
  
# print result
print("String after performing repeatition : " + res)

Output :

The original string : GeeksforGeeks
String after performing repeatition : GeeksforGeeksGeeksforGeeksGeek

Method #2 : Using divmod() + list slicing

The division applied in the above method can be substituted in this method with the divmod function, which improves code readability with the cost of 40% of performance degradation.

# Python3 code to demonstrate
# Repeat string till K
# using divmod() + list slicing
  
# initializing string 
test_string = "GeeksforGeeks"
  
# initializing K 
K = 30
  
# printing original string 
print("The original string : " + str(test_string))
  
# using divmod() + list slicing
# Repeat string till K
div, mod = divmod(K, len(test_string))
res = test_string * div + test_string[:mod]
  
# print result
print("String after performing repeatition : " + res)

Output :

The original string : GeeksforGeeks
String after performing repeatition : GeeksforGeeksGeeksforGeeksGeek

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