How to Handle Multiline Input in Python 3?

Getting Multiline Input from Users in Python

Input handling can be a crucial task in many programming scenarios. Python 3 has introduced several changes compared to Python 2, and one notable difference is the revised behavior of the input() function. In Python 3, input() reads and returns only a single line of input, leading to difficulties when working with multiple lines of data.

Why Not Use raw_input()?

In Python 2, the raw_input() function handled multiline input effectively. However, due to certain security concerns and the preference for a more consistent input handling approach, raw_input() was deprecated in Python 3.

Alternatives for Multiline Input

To address this issue and enable efficient handling of multiline input, there are two primary alternatives available in Python 3:

1. Looping with input() and EOF Handling:

This method involves creating a loop and repeatedly reading input until the end-of-file (EOF) is encountered. To handle EOF correctly, Python's EOFError exception can be used.

print("Enter/Paste your content. Ctrl-D or Ctrl-Z (windows) to save it.")
contents = []
while True:
    try:
        line = input()
    except EOFError:
        break
    contents.append(line)

2. Using sys.stdin.readlines():

This method reads the entire input from stdin (usually the user's keyboard input) and returns a list of lines.

import sys
contents = sys.stdin.readlines()

In conclusion, while raw_input() is no longer available in Python 3, there are alternative approaches that allow for efficient handling of multiline input. By using these methods, developers can effectively solve their input-handling requirements in Python 3.

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