How to use and examples of Python functions

1 year ago
Noah Thompson
1 minute

In Python, a function is a piece of code that can be executed repeatedly, take in parameters, and return a value.

A typical function definition usually includes the following parts:

  1. Function name: Identifies the name of a function, following naming conventions.
  2. Parameter: optional, used to accept incoming values.
  3. Code block: The main part of a function, containing a series of statements and logic.
  4. Return value: optional, the function can optionally return a value after execution.

Here is an example of a simple function definition and invocation:

# 定义一个函数，计算两个数的和
def add_numbers(a, b):
    sum = a + b
    return sum

# 调用函数，并将返回值保存到变量result中
result = add_numbers(5, 3)

# 打印结果
print(result)  # 输出：8

In the example above, we defined a function called add_numbers that takes two parameters, a and b, adds them together in the function body to get the sum, and returns the value of sum using the return statement. We then called this function, saved the return value in a variable called result, and finally printed result.

This is just a simple example, functions can include more complex logic and multiple parameters. Using functions can greatly improve the readability and reusability of code.

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