Declare a variable with type annotation and default value.

To declare a variable that stores a price as a floating-point number, initialized to 19.99.

When initializing a variable to hold a price value, e.g., in e-commerce, pricing calculations, or configuration.

Variable assignment, configuration initialization, data modeling in Python code.

<variable_name>: <type> = <literal>

<variable_name>: <type> = <literal>

variable_name type literal

• price cost amount rate float int str 0.0 19.99

• variable_name: price
• cost
• amount type: float
• int
• Decimal
• str literal: numeric literals
• string literals

missing colon after variable name missing equals sign type mismatch (e.g., price: float = '19.99') incorrect type annotation syntax (e.g., price: Float = 19.99)

price = 19.99 (no type annotation) price: int = 20 (different type) price: float = 0.0 (different default)

In TypeScript, syntax is `let price: number = 19.99;`; in C#, `float price = 19.99f;`; confusing syntax may lead to errors.

• variable_declaration
• type_annotation
• variable_initialization

The type annotation is optional in Python but aids static analysis and readability; the default value provides a sensible starting point.

Indicates that the variable is intended to hold a floating-point number representing a monetary value, initialized to a typical price.

price: float = 19.99

price: Decimal = Decimal('19.99')