2.1.1 Common Data Types
Definitions, purpose, and Python examples
Integer
Definition: An integer is a whole number with no decimal point.
Purpose: Used for counting and quantities.
When used: When values cannot be fractional.
Python example:
Purpose: Used for counting and quantities.
When used: When values cannot be fractional.
Python example:
age = 18
number_of_students = 25
print(age)
print(number_of_students)
Float
Definition: A float is a number that includes a decimal point.
Purpose: Used for precise measurements.
When used: When fractions or decimals are required.
Python example:
Purpose: Used for precise measurements.
When used: When fractions or decimals are required.
Python example:
price = 9.99
temperature = 21.5
print(price)
print(temperature)
String
Definition: A string is a sequence of characters used to store text.
Purpose: Used for names, messages, and textual data.
When used: Whenever information is not numeric.
Python example:
Purpose: Used for names, messages, and textual data.
When used: Whenever information is not numeric.
Python example:
name = "Alex"
message = "Welcome to Python"
print(name)
print(message)
Boolean
Definition: A Boolean stores one of two values: True or False.
Purpose: Used in decision‑making and conditions.
When used: When checking yes/no or true/false states.
Python example:
Purpose: Used in decision‑making and conditions.
When used: When checking yes/no or true/false states.
Python example:
is_logged_in = True
has_permission = False
print(is_logged_in)
print(has_permission)