Python | Extract length of longest string in list

• Last Updated : 29 Nov, 2019

Sometimes, while working with a lot of data, we can have a problem in which we need to extract the maximum length of all the strings in list. This kind of problem can have application in many domains. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using max() + generator expression
The combination of above functionalities can be used to perform this task. In this, we extract all the list lengths using generator expression and return maximum of them using max().

 # Python3 code to demonstrate working of# Extracting length of longest string in list# using max() + generator expression  # initialize list test_list = ['gfg', 'is', 'best']  # printing original list print("The original list : " + str(test_list))  # Extracting length of longest string in list# using max() + generator expressionres = max(len(ele) for ele in test_list)  # printing resultprint("Length of maximum string is : " + str(res))
Output :
The original list : ['gfg', 'is', 'best']
Length of maximum string is : 4

Method #2 : Using len() + key argument + max()
The combination of above functions can be used to perform this task. In this, we extract the maximum length using len() and max(). It is faster than above method as it performs more task built in rather than overhead by generator expression.

 # Python3 code to demonstrate working of# Extracting length of longest string in list# using len() + key argument + max()  # initialize list test_list = ['gfg', 'is', 'best']  # printing original list print("The original list : " + str(test_list))  # Extracting length of longest string in list# using len() + key argument + max()res = len(max(test_list, key = len))  # printing resultprint("Length of maximum string is : " + str(res))
Output :
The original list : ['gfg', 'is', 'best']
Length of maximum string is : 4

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