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How to take input in Python?

Taking input is a way of interact with users, or get data to provide some result. Python provides two built-in methods to read the data from the keyboard. These methods are given below.

  • input(prompt)
  • raw_input(prompt)

input()

The input function is used in all latest version of the Python. It takes the input from the user and then evaluates the expression. The Python interpreter automatically identifies the whether a user input a string, a number, or a list. Let's understand the following example.

Example -

Output:

Enter your name: Devansh
Devansh

The Python interpreter will not execute further lines until the user enters the input.

Let's understand another example.

Example - 2

Output:

Enter your name: Johnson
Enter your age: 21
Enter your marks: 89
The name is: Johnson
The age is 21
The marks is: 89.0

Explanation:

By default, the input() function takes input as a string so if we need to enter the integer or float type input then the input() function must be type casted.

We can see in the above code where we type casted the user input into int and float.

How input() function works?

  • The flow of the program has stopped until the user enters the input.
  • The text statement which also knows as prompt is optional to write in input() function. This prompt will display the message on the console.
  • The input() function automatically converts the user input into string. We need to explicitly convert the input using the type casting.
  • raw_input() - The raw_input function is used in Python's older version like Python 2.x. It takes the input from the keyboard and return as a string. The Python 2.x doesn't use much in the industry. Let's understand the following example.

Example -

Output:

Enter your name: Peter
Peter

How to check Python version?

To check the Python version, open command line (Windows), shell (Mac), or terminal (Linux/Ubuntu) and run python -version. It will display the corresponding Python version.

How to take input in Python

Check Python version in the running script

We can check the Python version in our running script. Consider the following ways to know Python version in all operating systems.

Commands Operating System/Environment Output
Python --version or
Python -v or
Python -vv
Window/Mac/Linux Python 3.8.1
import sys
sys.version
sys.version_info
Python Script 3.8.3 (default, May 13 2020, 15:29:51) [MSC v.1915 64 bit (AMD64)]
Import platform
platform.python_version()
Python Script '3.8.1'

Let's have a look at following image.

How to take input in Python




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