How Can I Efficiently Read from Standard Input (stdin) in Python?

Interacting with Standard Input: A Guide to Reading from stdin

Reading from the standard input stream is a common requirement in code golf challenges, where efficiency and conciseness are key. While various methods exist for input operations, in this article, we'll focus on the recommended approach using the fileinput module.

Meet fileinput: A Handy Input Iterator

The fileinput module provides an easy and robust way to iterate through lines of input from stdin or specified files. It automatically opens the standard input stream if no arguments are provided, making it effortless to read input directly.

Example in Action

To read lines from stdin using fileinput, simply follow this snippet:

import fileinput

for line in fileinput.input():
    # Do something with the line

Each line read from stdin will be available in the line variable within the for loop.

Trailing Newlines: A Note on Line Handling

By default, line will contain a trailing newline character. If this is not desired, you can easily remove it using the rstrip() method:

line = line.rstrip()  # Remove the trailing newline

With this in mind, you can now confidently tackle code golf challenges that require stdin input, maximizing your code's brevity and performance.

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