Python - Replace all words except the given word

Python – Replace all words except the given word

Last Updated : 01 Oct, 2020

Given a String. The task is to replace all the words with ‘?’ except the given word K.

Examples:

Input : test_str = ‘gfg is best for geeks’, K = “gfg”, repl_char = “?”
Output : gfg ? ? ? ?
Explanation : All words except gfg is replaced by ?.

Input : test_str = ‘gfg is best for gfg’, K = “gfg”, repl_char = “?”
Output : gfg ? ? ? gfg
Explanation : All words except gfg is replaced by ?.

Method #1 : Using split() + join() + loop

This is a brute way in which this task can be performed. In this, we perform the task of changing the string to word list using split() and then check for K word, if not found, replace it by the appropriate value. And at last, convert back to the string using join().

Python3

# Python3 code to demonstrate working of 
# Replace all words not K 
# Using join() + split() + loop 
  
# initializing string 
test_str = 'gfg is best for geeks gfg is for cs I love gfg'
  
# printing original string 
print("The original string is : " + str(test_str)) 
  
# initializing K 
K = "gfg"
  
# initializing repl_char 
repl_char = "?"
  
# extracting words 
temp = test_str.split(" ") 
for idx in range(len(temp)): 
    ele = temp[idx] 
  
    # replace non K with repl_char 
    if not ele == K: 
        temp[idx] = repl_char 
  
# joining result 
res = " ".join(temp) 
  
# printing result 
print("The resultant string : " + str(res)) 

Output:

The original string is : gfg is best for geeks gfg is for cs I love gfg
The resultant string : gfg ? ? ? ? gfg ? ? ? ? ? gfg

Method #2: Using list comprehension

This is yet another way in which this task can be performed. In this, we iterate for elements and perform the task using one-liner using similar functionality as the above method.

Python3

# Python3 code to demonstrate working of 
# Replace all words not K 
# Using list comprehension 
  
# initializing string 
test_str = 'gfg is best for geeks gfg is for cs I love gfg'
  
# printing original string 
print("The original string is : " + str(test_str)) 
  
# initializing K 
K = "gfg"
  
# initializing repl_char 
repl_char = "?"
  
# using one-liner to solve this problem 
res = " ".join( 
    [repl_char if not ele == K else ele for ele in test_str.split()]) 
  
# printing result 
print("The resultant string : " + str(res)) 