Learn Function Body | What Is a Function in Python?

The function body is the block of code inside a function definition. It contains the instructions that define what the function does.

Previously, you used mathematical formulas and the print() function as the body. However, a function body can include loops, if-else statements, keywords, or other logic.

Use one level of indentation to define the function body. Indentation in Python determines the structure of the code and specifies which statements belong to the function.

Example: Cat's Health Level

Write a function that determines a cat's health level based on the amount of calories it consumes daily. Consider the following conditions:

If the cat consumes less than 200 calories per day, the health level is "low";
If the cat consumes between 200 and 400 calories per day, the health level is "average";
If the cat consumes more than 400 calories per day, the health level is "high".


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def health_level_for_cat(calories_per_day):
	# Use one indentation to create function body
    if calories_per_day < 200:
        health_level = 'Low'
    elif 200 <= calories_per_day <= 400:
        health_level = 'Average'
    else:
        health_level = 'High'

    message = f"The cat's health level based on calorie intake is {health_level}."
    return message

# Example usage of the function
print("Cat Felix:", health_level_for_cat(187))
print("Cat Tom:", health_level_for_cat(301))
print("Cat Oggy:", health_level_for_cat(404))

The function's body begins with the function definition. Inside, an if-else statement determines the cat's health level based on daily calorie intake. After evaluating the condition, the function constructs a message reflecting the health level and returns it as the function's output.

In this example, the function assesses the cat's health level based on calorie consumption and generates a corresponding message, which is then printed as the function's output.

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Section 1. Chapter 5

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