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How Does the sys.stdin.readline() Method Work in Python?

Ashutosh Patel 651 21-Mar-2025

How Does the sys.stdin.readline() Method Work in Python?

python python  input handling 
Updated on 15-Apr-2025
Ashutosh Patel

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I am a professional .NET developer with over 4 years of hands-on industry experience in designing, developing, and maintaining scalable web applications. I specialize in .NET Core, C#, RESTful APIs, and database-driven systems using SQL Server.

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Khushi Singh

Khushi Singh

15-Apr-2025

The sys.stdin.readline method in Python allows users to read input from standard input (stdin) through faster data acquisition in competitive programming situations, along with large data applications.

Explanation:

  • Sys module contains this method therefore, you must first import the sys module to use it.
  • The readline function of the sys.stdin module permits users to input multiple lines of keyboard interaction including a termination character \n to indicate the end of input.
  • The method returns a string value that contains the trailing newline except when reading the last character of the input.
  • The strip or rstrip methods help eliminate newline characters from strings.

The method outperforms input() in terms of speed when clearing several or extensive input entries.

Code Example

import sys
print("Enter your name:")
name = sys.stdin.readline().strip()  # removes the newline character
print(f"Hello, {name}!")

Output

Enter your name:
Alice
Hello, Alice!

When to Use:

  • Reading input in competitive programming.
     
  • The function enables the handling of batch input, which includes file reading or data streams.
     
  • Situations where performance is critical.
     
  • The sys.stdin.readline() method stands as a prime input solution because it offers rapid processing of extensive or numerous inputs within the Python environment.

Also Read: Why Python has a future trend?

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