Definition
The process of transforming a value from one data type to another using built-in functions.
Why It Matters
Type conversion is the ‘translator’ between different data formats (e.g., strings to integers). Mastering it is essential for handling user input and data from external APIs, preventing ‘TypeError’ crashes and ensuring the program can process any incoming information.
Core Concepts
str(): Converts a value to a string (essential for concatenation).int(): Converts a value to an integer (truncates floats toward zero; fails on non-numeric strings).float(): Converts a value to a floating-point number.input()return type: Crucially,input()always returns a string, necessitating conversion for math operations.
# Convert string to integer for calculation
age = int("25")
new_age = age + 1
# Convert integer to string for concatenation
print("Age is " + str(new_age)) # Output: Age is 26
# Convert string to float
price = float("19.99")