Data types

Every value has a type. The four basic types:

str is text: "Sam"
int is a whole number: 30
float is a number with a decimal point: 9.99
bool is True or False (capital letters, no quotes)

type(x) tells you which type a value is. Watch the coloured type badges in the Visualizer.

print(type(42))   # <class 'int'>

See it run

count = 3
price = 3.0
label = "3"
ready = count > 2
print(type(label), type(ready))

Three values that all look like "3" but are different types. Watch the values in the Variables box.

Practice data types

Exercise 1

Create name = "Sam", age = 30, price = 9.99 and is_member = True. Then print type(price).

Exercise 2

Describe a delivery: parcel_id is text "007", count is integer 7, weight is float 7.0, and fragile is boolean False. Print type(parcel_id).

Exercise 3

Fix the sensor record in the code editor below: room must be text "12", reading float 18.0, and online boolean False. Store type(reading) in reading_type, then print it.

Free lesson: use the editor to practice it.

Practice

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Visualizer Watch your code run line by line

Run your code, then choose Play to follow its execution.

Memory · names → values

Variables appear here as Python creates them.

Output & plots