Method # 1: Using enumerate () + loop + upper ()
This problem can be solved using many of the above functions. This is a crude method for accomplishing this task, in which we iterate over each item in the line and change it to uppercase if it is in the changelog.

# Python3 code for demonstrations # Selective corpus in String # using loop + upper () + enumerate ()   # initialize string test_str = `gfg is best`   # print the original line print ( "The original string:" + str (test_str))   # initialize changelog chg_list = [ `g` , ` f` , `s` ]    # Selective corpus in String # using loop + upper () + enumerate () res = list (test_str) for idx, char in enumerate (res):   if char in chg_list : res [idx] = char.upper ()   # print result print ( "String after Selective casing:" + str (``. join (res)))

Exit:

 The original string: gfg is best String after Selective casing: GFG iS beSt 

& amp; Nsbp;

Method # 2: Using comprehension list + upper () + join ()
This is a shorthand version of this problem can be solved. In this we accomplish a task similar to the one described above, but one line using a list comprehension.

# Python3 code to demonstrate how it works # Selective body in String # using comprehension list + upper () + join ()   # initialize string test_str = `gfg is best`    # print the original line print ( "The original string:" + str (test_str)) < code class = "undefined spaces">   # initialize changelog chg_list = [ `g` , `f` , ` s` ]   # Selective body in String # use comprehension list + upper () + join () res = `` .join ([char.upper () if char in chg_list else char for char in test_str])   # print result print ( "String after Selective casing:" + str (`` .join (res)))

Output:

 The original string: gfg is best String after Selective casing: GFG iS beSt