Python - Remove similar index elements in Strings

Python – Remove similar index elements in Strings

Last Updated : 02 Sep, 2020

Given two strings, removed all elements from both, which are same at similar index.

Input : test_str1 = ‘geels’, test_str2 = ‘beaks’
Output : gel, bak
Explanation : e and s are removed as occur in same indices.
Input : test_str1 = ‘geeks’, test_str2 = ‘geeks’
Output : ”, ”
Explanation : Same strings, all same index, hence removed.

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

In this, we pair elements with its index using join(), and check for inequality to filter only dissimilar elements in both strings, join() is used to convert result in strings.

Python3

# Python3 code to demonstrate working of 
# Remove similar index elements in Strings
# Using join() + zip() + loop
  
# initializing strings
test_str1 = 'geeks'
test_str2 = 'beaks'
  
# printing original strings
print("The original string 1 is : " + str(test_str1))
print("The original string 2 is : " + str(test_str2))
  
# conversion to list for zipping
list1 = list(test_str1)
list2 = list(test_str2)
res1 = []
res2 = []
for ch1, ch2 in zip(list1, list2):
      
    # check inequalities
    if ch1 != ch2:
        res1.append(ch1)
        res2.append(ch2)
  
# conversion to string 
res1 = "".join(res1)
res2 = "".join(res2)
      
# printing result 
print("Modified String 1 : " + str(res1)) 
print("Modified String 2 : " + str(res2)) 

Output

The original string 1 is : geeks
The original string 2 is : beaks
Modified String 1 : ge
Modified String 2 : ba

Method #2 : Using list comprehension

Performs task using similar method as above, just one-liner to perform task in compact form.

Python3

# Python3 code to demonstrate working of 
# Remove similar index elements in Strings
# Using list comprehension
  
# initializing strings
test_str1 = 'geeks'
test_str2 = 'beaks'
  
# printing original strings
print("The original string 1 is : " + str(test_str1))
print("The original string 2 is : " + str(test_str2))
  
# one-liner to solve problem
res = ["".join(mastr) for mastr
      in zip(*[(a, b) for a, b in zip(test_str1, test_str2) if a != b])]
  
# printing result 
print("Modified String 1 : " + str(res[0])) 
print("Modified String 2 : " + str(res[1])) 

Output

The original string 1 is : geeks
The original string 2 is : beaks
Modified String 1 : ge
Modified String 2 : ba

Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.

To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course. And to begin with your Machine Learning Journey, join the Machine Learning – Basic Level Course

My Personal Notes

Related Articles

Python3

Python3