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Python – Every Kth Strings Uppercase
  • Last Updated : 05 Sep, 2020

Given a String list, change every Kth string to uppercase.

Input : test_list = [“gfg”, “is”, “best”, “for”, “geeks”], K = 3
Output : [‘GFG’, ‘is’, ‘best’, ‘FOR’, ‘geeks’]
Explanation : All Kth strings are uppercased.

Input : test_list = [“gfg”, “is”, “best”, “for”, “geeks”], K = 4
Output : [‘GFG’, ‘is’, ‘best’, ‘for’, ‘GEEKS’]
Explanation : All Kth strings are uppercased.

Method #1 : Using loop + upper()

In this, we iterate for all strings using loop and upper is used to perform uppercase, Kth index is detected using modulo operator.



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# Python3 code to demonstrate working of 
# Every Kth Strings Uppercase
# Using loop + upper()
  
# initializing list
test_list = ["gfg", "is", "best", "for", "geeks", "and", "CS"
  
# printing original list
print("The original list is : " + str(test_list))
  
# initializing K 
K = 3
  
res = []
for idx in range(len(test_list)):
      
    # checking for Kth index
    if idx % K == 0:
        res.append(test_list[idx].upper())
    else :
        res.append(test_list[idx])
  
# printing result 
print("The resultant String list : " + str(res))

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Output

The original list is : ['gfg', 'is', 'best', 'for', 'geeks', 'and', 'CS']
The resultant String list : ['GFG', 'is', 'best', 'FOR', 'geeks', 'and', 'CS']

Method #2 : Using list comprehension

This yet another way in which this task can be performed. In this we use list comprehension as shorthand, performs tasks similar to above method.

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# Python3 code to demonstrate working of 
# Every Kth Strings Uppercase
# Using list comprehension
  
# initializing list
test_list = ["gfg", "is", "best", "for", "geeks", "and", "CS"
  
# printing original list
print("The original list is : " + str(test_list))
  
# initializing K 
K = 3
  
# shorthand to perform this task
res = [test_list[idx].upper() if idx % K == 0 else test_list[idx]
       for idx in range(len(test_list))]
  
# printing result 
print("The resultant String list : " + str(res))

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Output

The original list is : ['gfg', 'is', 'best', 'for', 'geeks', 'and', 'CS']
The resultant String list : ['GFG', 'is', 'best', 'FOR', 'geeks', 'and', 'CS']

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