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String slicing in Python to check if a can become empty by recursive deletion
In this tutorial, we are going to write a program that will check whether the given string can become empty or not by recursive deletion of chars using slice. Let's see an example to understand it more clearly.
string = "tutorialstutorialspointpoint" sub_string = "tutorialspoint"
- After first iteration tutorialstutorialspointpoint becomes tutorialspoint.
- After the second iteration, the string will be empty.
We can achieve the result using find() method of the string. Follow the below steps to write the program.
- Initialize the string and sub_string.
- If any of them is empty, then return False
- While string length is greater than zero. Do the following.
- Check whether the sub_string is present in string or not.
- If not present, then return False
- Return True as the loop doesn't terminate in middle.
def is_valid(string, sub_string): # checking the lengths of string and sub_string if len(string) > 0 and len(sub_string): # iterating until string becomes empty while len(string) > 0: # finding the sub_string in string index = string.find(sub_string) # checking whether its present or not if index == -1: # returning false return False # removind the sub_string string = string[0: index] + string[index + len(sub_string):] # returning True return True else: # returning False return False if __name__ == '__main__': # initializing the string and string string = 'tutorialstutorialspointpoint' sub_string = 'tutorialspoint' # invoking the method print(is_valid(string, sub_string))
If you run the above code, then you will get the following result.
If you have any queries in the tutorial, mention them in the comment section.
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