In Python, casting refers to the process of converting one data type to another. It allows you to change the type of a variable or value to perform certain operations or assignments that require a specific data type. Python provides several built-in functions for casting, including:
int(): This function converts a value to an integer. It can be used to cast floating-point numbers or strings that represent whole numbers to integers. For example:python
x = int(3.14) # x will be 3 y = int("10") # y will be 10
float(): This function converts a value to a floating-point number. It can be used to cast integers or strings that represent numbers with decimal places to floats. For example:
x = float(5) # x will be 5.0 y = float("3.14") # y will be 3.14
str(): This function converts a value to a string. It can be used to cast any data type to a string representation. For example:
x = str(10) # x will be "10" y = str(3.14) # y will be "3.14"
bool(): This function converts a value to a Boolean. It can be used to cast any data type to a Boolean value. In Python, 0, empty sequences (e.g., empty string, empty list), and None are considered as
False, while non-zero numbers and non-empty sequences are considered as
True. For example:
x = bool(0) # x will be False y = bool(10) # y will be True z = bool("") # z will be False
These are some of the commonly used casting functions in Python. It’s important to note that not all types can be cast to each other. For example, trying to cast a string that doesn’t represent a valid number to an integer or float will result in a
ValueError. Make sure to handle potential casting errors appropriately in your code.