What is input () Python?

Tim 162 Published: 06/29/2024

What is input () Python?

I'm glad you asked!

input() is a built-in Python function that reads a line of text from the standard input (usually, but not exclusively, the console) and returns it as a string. It's often used to get user input or data from an external source.

When you call input(), Python waits for the user to enter some text, followed by the Enter key. The function then returns the entire line of text as a string, including any leading or trailing whitespace.

Here are some examples of how you can use input():

Simple input: You can ask the user for their name: 
name = input("What's your name? ")

print(f"Hello, {name}!")

This would prompt the user to enter their name, and then print out a greeting message with the entered name.

Converting input to integers or floats: You can convert the input string to an integer or float using int() or float(), respectively: 
age = int(input("How old are you? "))

print(f"You're {age} years old!")

This would ask the user for their age and then print out a message with the entered age.

Multiple inputs: You can use input() multiple times to collect different pieces of information: 
name = input("What's your name? ")

age = int(input("How old are you? "))


print(f"Hello, {name}! You're {age} years old!")

This would ask the user for their name and age, and then print out a greeting message with both pieces of information.

Default values: You can provide default values for input() using the default argument: 
color = input("What's your favorite color? (default: blue) ", "blue")

print(f"Your favorite color is {color}!")

This would ask the user to enter their favorite color, with a default value of "blue" if they don't provide one.

In summary, input() is an essential function in Python that allows you to collect text input from users, convert it to different types (e.g., integers or floats), and use it to drive your program's logic.

Input and output function in Python tutorialspoint

Here is a comprehensive introduction to input and output functions in Python using tutorialspoint:

Introduction

Input and Output (I/O) operations are fundamental in any programming language, including Python. I/O operations allow your program to interact with the user, read data from various sources, and write data to files or other destinations. In this tutorial, we will explore input and output functions in Python.

Input Functions

Python provides several built-in input functions that enable you to take user input and perform various tasks. Let's look at some of these functions:

input(): This is the most basic input function in Python. It prompts the user for input and returns a string containing the user's response.

Example:

name = input("What is your name? ")

print("Hello, " + name + "!")  # Output: Hello, John!
raw_input(): This function is similar to input(), but it preserves the newline character (n) at the end of the user's response.

Example:

name = raw_input("What is your name? ")

print(name)  # Output: What is your name?John

Output Functions

Python also provides several built-in output functions that allow you to print data to the console, write to files, or perform other output operations. Let's explore some of these functions:

print(): This is the most basic output function in Python. It prints its argument(s) to the console.

Example:

print("Hello, World!")  # Output: Hello, World!
input(): Believe it or not, input() can also be used for output! When you pass a string as an argument, it will print that string to the console.

Example:

name = "John"

print(input("Hello, " + name + "!"))  # Output: Hello, John!
open(): This function allows you to write data to a file. It returns a file object that you can use to perform various I/O operations.

Example:

with open("example.txt", "w") as f:

f.write("Hello, World!")
sys.stdout.write(): This function writes its argument(s) directly to the console.

Example:

import sys

print(sys.stdout.write("Hello, World!"))  # Output: Hello, World!

Conclusion

In this tutorial, we have explored input and output functions in Python using tutorialspoint. We have seen various built-in input functions, including input() and raw_input(), and several built-in output functions, such as print(), input(), open(), and sys.stdout.write(). With these I/O operations, you can create interactive programs that read data from users and write data to files or other destinations.

References

Python Tutorial: Input/Output Functions tutorialspoint: Python Input/Output

I hope this helps! Let me know if you have any questions.

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