Module 1-1,2,3,4

Variable naming rules

• only contain letters, numbers, and underscores

• start with a letter or underscore (message_1, _message_1), but not with a number (1_message)

• spaces are not allowed, use underscores as separator

• avoid Python keywords and function names as variable names

Built in Python keywords and function names

Avoid using when naming variables

Data types in Python (8)

int, float, str, list, tuple, set, dict, bool

Lowest to highest rank type promotion

1. Boolean

2. Integer

3. Float

4. Complex

Division always returns a

float

What does the // operator do?

// is a ‘floor’ division — returns an integer

How to tab & create a new line

\t

\n

What are 3 data types that you can concatenate (given the elements you are trying to concatenate are all the same type)

1. Strings

2. Lists

3. Tuples

Slice notation syntax

string[start:end]

• Begin at start index, does not include end index

Negative indexing

• -1 is the last item in list/string

Slices with steps syntax

string[start : end : step]

step is what we count the indexes by (2 would be skipping every second index)

When would a runtime error occur?

When the syntax is correct, but an issue may arise due to wrong types/names/indexes/dividing by 0