Computer Science

text within source code that is ignored by the compiler or interpreter, used to help programmers understand the code

the name that a programmer gives to a variable, constant, or subroutine

refers to the ease with which maintenance activities can be performed on code, such as correcting errors

Good programming practices

Using selection when developing programs

Arithmetic operators

Relational operators

Logical operators

Nested selection

Selection challenge

Programming project: selection I

Programming project: selection II

In this unit pupils will explore the benefits of good programing practices and why subroutines are used in programs. They will create conditions in programs which use arithmetic, relational and logical expressions. They will develop their understanding of selection and explore nested selection.

Programming: selection

They make the code easier to read and maintain.

They reduce the number of lines in a program.

Why are good programming practices important?

to increase the execution speed of a program

to make the program output messages to the user

to explain parts of the code to programmers

What is the purpose of comments in programming?

a naming convention where words are separated by underscores (_)

What is snake case, and where is it commonly used?

To make a program easier to understand, you should use {{}} variable names instead of single-letter names like x or y.

explains parts of the code to other programmers

uses indentation and spacing to improve readability

meaningful variable names to describe stored data

follow standard ways of writing variable names

Match the good programming practice with its purpose.

{{}} is the ease with which maintenance activities can be performed on a program, such as fixing errors.

{{}} selection in programming is a selection statement placed inside another selection statement.

What does the `upper()` method do when used on a string in Python?

store all usernames in a list and check using if username is in list

use a loop to ask for different usernames

How can a program be modified to check more than one username?

The correct way to ensure case-insensitive username input is: `username = input().`{{}}

The expression `if score > 10:` checks if the score is __________ 10.

Good programming practices

Lesson outcome