Python: Variable

Creating a variable

name = "Alice"
age = 20

• No need to declare type.
• Value can be any type.

Multiple assignment

a, b, c = 1, 2, 3
print(a,b,c)
# 1 2 3

# all set to 0
a = b = c = 0
print(a,b,c)
# 0 0 0

Allowed characters in variable names

• Must start with a letter or underscore (_)
• Can contain letters, numbers, and underscores
• Case-sensitive (age and Age are different)
• Cannot be a Python keyword (if, for, class, etc.)

Changing a variable value

x = 10
print(x)
# 10

# reassign
x = "ten"
print(x)
# ten

Checking the type

x = 3
print(type(x))
# <class 'int'>