variables

Python is dynamically typed, which means you do not declare variable types. A variable is created the moment you assign a value to a name.

name = "Grace"
age = 37

Every value in Python is an object, and variables are references to those objects.

Naming Rules

• Must start with a letter or underscore.

• Cannot start with a number.

• May contain letters, numbers, and underscores.

• Case-sensitive: age, Age, and AGE are different.

Good Naming

total_volume = 12
user_email = "[e-mail]"

Multiple Assignment

x, y, z = 1, 2, 3
first_name, last_name = "Ada", "Lovelace"

Reassignment and Types

count = 10
count = "ten"  # valid, but try to avoid confusing changes

print(type(count))  # <class 'str'>

Quick Practice

1. Create a variable city and assign your city name.

2. Create a variable temperature and assign a number.

3. Print both in one sentence using an f-string.

city = "Lagos"
temperature = 28
print(f"The temperature in {city} is {temperature}C.")

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