Python · Theory

Python Variables

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Python Variables

A variable is a name pointing at a value. age = 21 creates the name age and binds it to 21. No type word on the left. The type lives on the object. Later age = "twenty" is allowed — dynamic typing — but jumping types in real code confuses readers.

Names: letters, digits, underscore. Cannot start with a digit. Cannot be a keyword. Style is snake_case: student_name. a, b = 1, 2 unpacks two values. Using a name before assignment → NameError. That is the first crash most freshers see.

Python Variables — output — Pune · age 21. Two real variables.

Exam tip

Assignment creates the binding; types live on objects.

Example

# Variables
age = 21
city = "Pune"
print(city, "· age", age)

Python Variables — output: Pune · age 21. Two real variables.

Short notes

Defname = value.
Rulesnake_case. No keyword names.
TrapNameError if used before assign.

Python · Theory

Python Variables

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Theory

13/268

Python Variables

Python Variables — output — Pune · age 21. Two real variables.

Exam tip

Assignment creates the binding; types live on objects.

Example

# Variables
age = 21
city = "Pune"
print(city, "· age", age)

Python Variables — output: Pune · age 21. Two real variables.

Short notes

Defname = value.
Rulesnake_case. No keyword names.
TrapNameError if used before assign.

Python Variables

Example

Short notes

Questions

Python Variables

Example

Short notes

Questions