Question

How to capitalize every 3rd letter in a string in Python

Answer 1

s = "pythonisaninterpretedgeneralpurposeprogramminglanguage"

lst = list(s)

lst[2::3] = [ch.upper() for ch in lst[2::3]]
print(lst)

s = ''.join(lst)
 
print(s)
 

 
      
'''
run:
      
['p', 'y', 'T', 'h', 'o', 'N', 'i', 's', 'A', 'n', 'i', 'N', 't', 'e', 'R', 'p', 'r', 'E', 't', 'e', 'D', 'g', 'e', 'N', 'e', 'r', 'A', 'l', 'p', 'U', 'r', 'p', 'O', 's', 'e', 'P', 'r', 'o', 'G', 'r', 'a', 'M', 'm', 'i', 'N', 'g', 'l', 'A', 'n', 'g', 'U', 'a', 'g', 'E']
pyThoNisAniNteRprEteDgeNerAlpUrpOseProGraMmiNglAngUagE
  
'''

 

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Answer 2

s = "python is an interpreted general purpose programming language"

lst = list(s)

lst[2::3] = [ch.upper() for ch in lst[2::3]]
print(lst)

s = ''.join(lst)
 
print(s)
 

 
      
'''
run:
      
['p', 'y', 'T', 'h', 'o', 'N', ' ', 'i', 'S', ' ', 'a', 'N', ' ', 'i', 'N', 't', 'e', 'R', 'p', 'r', 'E', 't', 'e', 'D', ' ', 'g', 'E', 'n', 'e', 'R', 'a', 'l', ' ', 'p', 'u', 'R', 'p', 'o', 'S', 'e', ' ', 'P', 'r', 'o', 'G', 'r', 'a', 'M', 'm', 'i', 'N', 'g', ' ', 'L', 'a', 'n', 'G', 'u', 'a', 'G', 'e']
pyThoN iS aN iNteRprEteD gEneRal puRpoSe ProGraMmiNg LanGuaGe

'''

 

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