Input

What is input?

Programs typically receive input from outside the program. Otherwise, the program would always follow exactly the same path.

Input can come from, for example:

• From the terminal (asks the user for something).
• As a command line parameter (run the program like python3 app.py dippadappaduu, where dippadappaduu would be the first command line parameter).
• From file on disk
• From the online service
• From an HTTP request, if it is a web application
• ...and from anywhere else.

input function

We have so far become acquainted with only one of Python's built-in functions, print, which prints to the terminal. Now we will get to know its counterpart, input, which reads input from the terminal.

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

python3 ./app.py
What is your name? Act
Act

Merging Texts

In Python, texts can be combined with each other using the plus (+) operator.

print("A" + "B" + "C")
ABC

We can create a program that greets the user:

name = input("What is your name?")
print("Hello, " + name)

python3 ./app.py
What is your name? Act
Hello, Teo

Exercise

Example of how the program should work:

python3 ./app.py
What is the player's name? Act
Player 1: Action