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Python | Test if string is subset of another
  • Last Updated : 22 Apr, 2020

Sometimes, while working with strings, we can have a problem in which we need to test if a string is a subsequence of another. This can have possible application in many domains including data science and day-day programming. Lets discuss certain ways in which this task can be performed.

Method #1 : Using all()
This is one of the by which we can solve this problem. In this, we employ all() to check if all the characters of one string are present in another.

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# Python3 code to demonstrate working of 
# Test if string is subset of another
# Using all()
  
# initializing strings
test_str1 = "geeksforgeeks"
test_str2 = "gfks"
  
# printing original string
print("The original string is : " + test_str1)
  
# Test if string is subset of another
# Using all()
res = all(ele in test_str1 for ele in test_str2)
  
# printing result 
print("Does string contains all the characters of other list? : " + str(res)) 

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Output :

The original string is : geeksforgeeks
Does string contains all the characters of other list? : True

 

Method #2 : Using issubset()
Using an inbuilt function is one of the ways in which this task can be performed. In this, we just employ the function and it returns the result after internal processing.



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# Python3 code to demonstrate working of 
# Test if string is subset of another
# Using issubset()
  
# initializing strings
test_str1 = "geeksforgeeks"
test_str2 = "gfks"
  
# printing original string
print("The original string is : " + test_str1)
  
# Test if string is subset of another
# Using issubset()
res = set(test_str2).issubset(test_str1)
  
# printing result 
print("Does string contains all the characters of other list? : " + str(res)) 

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Output :

The original string is : geeksforgeeks
Does string contains all the characters of other list? : True

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