Python Type Casting: Specifying Variable Types

In the Python programming language, there are scenarios where explicitly defining the data type of a variable becomes essential. This process, known as type casting, allows developers to convert values between different data types deliberately.

Since Python is an object-oriented language, it utilizes class-based constructors to define and transform its built-in data types. Rather than relying on implicit conversions, Python provides clear constructor functions for casting, offering greater control over data manipulation.

Constructor Functions Used for Casting in Python

• int() – Converts a value into an integer. It accepts an integer literal, a float (truncating decimals), or a numeric string that represents a whole number.
• float() – Converts a value into a float. It accepts integers, floats, or numeric strings that represent decimal or whole numbers.
• str() – Converts a value into a string. It can transform integers, floats, or other string representations into the string data type.

Examples of Integer Casting

x = int(1)       # x will be 1
y = int(2.8)     # y will be 2 (decimal removed)
z = int("3")     # z will be 3 (string converted to int)

Examples of Float Casting

x = float(1)     # x will be 1.0
y = float(2.8)   # y will be 2.8
z = float("3")   # z will be 3.0 (string converted to float)
w = float("4.2") # w will be 4.2

Examples of String Casting

x = str("s1")    # x will be 's1'
y = str(2)       # y will be '2'
z = str(3.0)     # z will be '3.0'

Understanding how to use these constructors properly is fundamental in Python development, especially when handling user input, file data, or API responses. By casting variables correctly, you ensure your code runs efficiently and as expected.

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