1.2.1

Input & Output

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Input

There must be some mechanism for the user to input data to the computer.

What data can I input?

What data can I input?

  • Data can be input from any device connected to the computer.
  • The keyboard is the most common data input device for command line programs.
  • We will only look at keyboard input in this course.
The input function

The input function

  • Python has a built in function (command) which allows us to take keyboard input.
  • We can use the code: input(“Prompt”) to take the input.
  • We can write any text for the “Prompt”, which will be displayed to the user before they type their response.
  • A prompt is a message that is displayed to the user before they type their response.
Data type of input

Data type of input

  • When data is entered from the keyboard, it is automatically a ‘string’.
  • A string is a sequence of character inputs from the keyboard, for example ‘Hello’.

Output

Output is necessary so that we can see the results of programs.

Why do we need outputs?

Why do we need outputs?

  • Outputs are important so that we can communicate the result of a program to the user.
  • Outputs are usually delivered as text onto the screen.
The print function

The print function

  • The output function in Python is called ‘print’.
  • The output function ‘prints’ data onto the screen.
    • E.g. print(“Hello, world!”) would output the text “Hello, World!”.
What data can be outputted?

What data can be outputted?

  • Output data must be a string before we can print it.
  • If we want to display data that is not a string, then we must first cast it to a string.
Jump to other topics
1

Introduction to Python

1.1

Python

1.1.1Python
1.2

Input & Output

1.2.1Input & Output
1.3

Data Types

1.3.1Data Types
1.4

Variables & Constants

1.4.1Variables & Constants
1.5

Operators

1.5.1Arithmetic & Relational Operators1.5.2Boolean & Assignment Operators 2
1.6

Program Flow

1.6.1Selection1.6.2Iteration
2

Data Structures

2.1

Lists & Strings

2.1.1Lists2.1.2Strings
2.2

File Handling

2.2.1File Handling
3

Modularity

3.1

Subroutines

3.1.1Subroutines
3.2

Data Flow

3.2.1Data Flow
4

Good Practice

4.1

Naming & Whitespace

4.1.1Identifiers4.1.2Whitespace
4.2

Comments

4.2.1Comments
4.3

Exceptions

4.3.1Exceptions

Practice questions on Input & Output

Can you answer these? Test yourself with free interactive practice on Seneca — used by over 10 million students.

  1. 1
    What is the most common input device for command line programs?Multiple choice
  2. 2
    What data type is keyboard input?Multiple choice
  3. 3
    Data can only be input from a keyboard. True or false?Multiple choice
  4. 4
    How are outputs usually delivered in a command line program?Multiple choice
  5. 5
    Why are output statements used?Multiple choice
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Python

Data Types