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How do you find the longest string in a list Python?

Python | Longest String in list

Sometimes, while working with Python Lists, we can have a problem in which we receive Strings as elements and wish to compute the String which has maximum length. This kind of problem can have applications in many domains. Let’s discuss certain ways in which this problem can be solved.

Method #1 : Using loop
This is the brute method in which we perform this task. In this, we run a loop to keep a memory of longest string length and return the string which has max length in list.

# Python3 code to demonstrate working of

# Longest String in list

# using loop

# initialize list

test_list = ['gfg', 'is', 'best', 'for', 'geeks']

# printing original list

print["The original list : " + str[test_list]]

# Longest String in list

# using loop

max_len = -1

for ele in test_list:

if len[ele] > max_len:

max_len = len[ele]

res = ele

# printing result

print["Maximum length string is : " + res]

Output : The original list : ['gfg', 'is', 'best', 'for', 'geeks'] Maximum length string is : geeks

Method #2 : Using max[] + key
This method can also be used to solve this problem. In this, we use inbuilt max[] with “len” as key argument to extract the string with the maximum length.

# Python3 code to demonstrate working of

# Longest String in list

# using max[] + key

# initialize list

test_list = ['gfg', 'is', 'best', 'for', 'geeks']

# printing original list

print["The original list : " + str[test_list]]

# Longest String in list

# using max[] + key

res = max[test_list, key = len]

# printing result

print["Maximum length string is : " + res]

Output : The original list : ['gfg', 'is', 'best', 'for', 'geeks'] Maximum length string is : geeks

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Problem Formulation

Given a Python list of strings. Find the string with the maximum number of characters—the longest string in the list.

Here are a few example list of strings and the desired output:

# ['Alice', 'Bob', 'Pete'] ----> 'Alice' # ['aaa', 'aaaa', 'aa'] ----> 'aaaa' # [''] ----> '' # [] ----> ''

Solution: max[] function with key function argument len[]

Use Python’s built-in max[] function with a key argument to find the longest string in a list. Call max[lst, key=len] to return the longest string in lst using the built-in len[] function to associate the weight of each string—the longest string will be the maximum.

Here’s the code definition of the get_max_str[] function that takes a list of strings as input and returns the longest string in the list or a ValueError if the list is empty.

def get_max_str[lst]: return max[lst, key=len]

Here’s the output on our desired examples:

print[get_max_str[['Alice', 'Bob', 'Pete']]] # 'Alice' print[get_max_str[['aaa', 'aaaa', 'aa']]] # 'aaaa' print[get_max_str[['']]] # '' print[get_max_str[[]]] # ValueError

How to Choose the Longest String in a Python List?

In this article, we will learn to find the longest string from a List in Python. We will use some built-in functions and some custom code as well. Let's first have a quick look over what is s list in Python.

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“how to find the longest string in a list in python” Code Answer’s

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Python | Longest String in list

Problem Formulation

Solution: max[] function with key function argument len[]

How to Choose the Longest String in a Python List?

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