Functions

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A function is a block of code which only runs when it is called. It helps organize code, reduces repetition, and can take input, perform a task, or return a result.

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Functions make code more modular, easier to understand, easier to debug, and less repetitive. A large problem can be divided into smaller parts, and each part can be handled by a separate function.

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A function can receive data called parameters. This data is used inside the function to perform an action. For example, a function can take a number and return a calculated result.

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A built-in function is a function already available in Python. It can be used directly without importing any extra file. Examples include min(), max(), abs(), type(), len(), round(), and range().

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int() is a type conversion function that converts a value into an integer. If a floating-point number is given, it truncates the decimal part. For example, int(34.8) gives 34. A non-numeric string suc…

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x becomes 3. The string "3" is converted into the integer 3 by int().

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float() is a type conversion function that returns a floating-point number from a number or from a numeric string. For example, float(34) gives 34.0. A non-numeric string such as float('delhi') causes…

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input() accepts a string from the user without evaluating it. Program flow stops until input is entered. Whatever is typed is converted into a string, even if an integer is entered.