What Are the Differences Between input() and sys.stdin.read() in Python?

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Khushi Singh · Answer

The input() function in 
Python allows user input directly from the console by displaying prompts, whereas
sys.stdin.read() reads input from the keyboard buffer of a program. Both functions have separate uses in different scenarios. Users typically employ the input() function to obtain interactive input for most Python applications. The input function shows an optional prompt if provided to users before it waits for a single line of input until they press Enter. The program returns captured input as a string. The input method provides an excellent solution for interactive user-oriented tasks when users need to provide a single line of input.
The read function of sys.stdin reads the complete input stream, which terminates when an End-of-File (EOF) signal emerges. This function differs from input() because it does not issue any prompts to users while reading all input at once, including multi-line entries. The function operates best when handling data obtained from files or pipes and bulk data processing requests. This method offers vital functionality, especially in competitive programming or automated testing environments, which redirect data entry from various sources.
This example illustrates the combination of both methods for data handling as follows:
# Using input()
name = input("Enter your name: ")
print("Hello,", name)
# Using sys.stdin.read()
import sys
print("Enter multiple lines of text (Press Ctrl+D to end input on Unix or Ctrl+Z on Windows):")
data = sys.stdin.read()
print("You entered:
", data)
The program utilizes the input() function to accept one line of user input before generating a greeting. The second section deploys
sys.stdin.read() to receive continuous lines before printing every received input when the end-of-file signal terminates the input. Your application requires either simple user interaction through
input() or bulk input using sys.stdin.read() based on your needs.
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What Are the Differences Between input() and sys.stdin.read() in Python?

Ashutosh Kumar Verma

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