How to Find the Longest Line from a Text File in Python
Last Updated : 31 May, 2024
Finding the longest line from a text file consists of comparing the lengths of each line to determine which one is the longest. This can be done efficiently using various methods in Python. In this article, we will explore three different approaches to Finding the Longest Line from a Text File in Python.
Find the Longest Line from a Text File in Python
Below are the possible approaches to Finding the Longest Line from a Text File in Python.
- Using a for Loop and max with Key
- Using readlines Method
- Using List Comprehension and max
file.txt
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Find the Longest Line from a Text File Using a for Loop and max with Key
In this example, we are using the max function with the key parameter set to len to find the longest line in the file. The max function iterates through each line and compares their lengths.
Python with open('file.txt', 'r') as file: longest_line = max(file, key=len) print("Longest line:", longest_line) Output:
Longest line: GeeksforGeeks also provides a variety of courses to learn different technologies and programming languages.
Find the Longest Line from a Text File Using readlines Method
In this example, we are using the readlines method to read all lines into a list. We then iterate through the list to find the longest line by comparing the lengths of the lines.
Python with open('file.txt', 'r') as file: lines = file.readlines() longest_line = "" for line in lines: if len(line) > len(longest_line): longest_line = line print("Longest line:", longest_line) Output:
Longest line: GeeksforGeeks also provides a variety of courses to learn different technologies and programming languages.
Find the Longest Line from a Text File Using List Comprehension and max
In this example, we are using list comprehension to read all lines into a list and then applying the max function with the key parameter set to len. The max function identifies the longest line based on length.
Python with open('file.txt', 'r') as file: lines = [line for line in file] longest_line = max(lines, key=len) print("Longest line:", longest_line) Output:
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