Selection

Test yourself

If-statements

If-statements are the only form of selection in Python.

If statements

Conditions can be tested using the if statement. For example:
- if (x > 50):
Any code written in an indented block after this line will be executed if the condition is true.

Else statements

We can also add an else statement to the end, for example:
- else:
This will only execute the following indented block if the condition was false.

Elif statements

Elif statements can be added between if and else blocks.
They will execute if the condition before it was false, and the condition following it is true.

Example

1Introduction to Python

1.1Python

1.1.1Python

1.2Input & Output

1.2.1Input & Output

1.3Data Types

1.3.1Data Types

1.4Variables & Constants

1.4.1Variables & Constants

1.5Operators

1.5.1Arithmetic & Relational Operators

1.5.2Boolean & Assignment Operators 2

1.6Program Flow

1.6.1Selection

1.6.2Iteration

2Data Structures

2.1Lists & Strings

2.1.1Lists

2.1.2Strings

2.2File Handling

2.2.1File Handling

3Modularity

3.1Subroutines

3.1.1Subroutines

3.2Data Flow

3.2.1Data Flow

4Good Practice

4.1Naming & Whitespace

4.1.1Identifiers

4.1.2Whitespace

4.2Comments

4.2.1Comments

4.3Exceptions

4.3.1Exceptions

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