<Python tools> data types (part 1/2)

Topic 2: three data types — Dictionary, Numeric and Boolean

Learning through topic 1, we know how to use Python as a calculator and to assign variables. Now let’s dig into built-in data types in Python!

In topic 2, we introduce three data types: Dictionary, Numeric and Boolean

Following are the built-in data types in Python:

Numeric data type:

1. Integer (int)

Int contains positive or negative whole number.

2. Float

Float contains real numbers with decimal point.

3. Complex

Complex contains (real number) + (imagine number)

Boolean (bool)

Boolean values used in Python come up with two outcomes: True or False.

(Caution! True and False with capital ‘T’ and ‘F’ are valid booleans otherwise python will throw an error.)

Boolean is often used to show a result after running the codes. b==cis a way to calculate wether b equals c.

b is 2, and c is 3, so that b does not equal c. The boolean value of is b==cFalse.

Dictionary (dict)

A dictionary is a set of key: value pairs. A pair of braces creates an empty dictionary: {}. We build a dictionary like this: {key: value}

Main function of a dictionary: storing values with keys.

The example below creates a dictionary, using country codes as keys.

If we want the keys sorted, we can use sorted()

Upcoming in Topic 3 :

we will introduce Sequence and Set.