Python Type Casting

Satellite · Data Types

Type Casting

Python uses constructors (`int()`, `float()`, `str()`, etc.) for conversions. Learn the patterns and how to handle errors gracefully.

Operation	Example	Notes
String → int	`int("42")`	Raises `ValueError` if invalid
String → float	`float("3.14")`	Beware locale differences
Any → string	`str(obj)`	Calls `__str__`
Iterable → list	`list(range(3))`	Copies elements
Iterable → set	`set(names)`	Removes duplicates
Int ↔ float	`float(5)` / `int(5.9)`	`int` truncates toward zero

Implement __int__, __float__, __str__, or __bool__ methods to customize casting for your classes.

try:
    price = float(raw_price)
except ValueError:
    raise ValueError("Invalid price provided")

Always validate user input before casting.

Data types pillar

See the bigger context for all built-ins.

Error handling

Catch conversion errors gracefully.

File handling

Parse CSV/JSON data into typed values.