课程

Python 函数入门

基础技能水平

更新时间 2025年12月

学习在 Python 中编写自己的函数，以及作用域和错误处理等关键概念。

免费开始课程

PythonProgramming

3小时

10 视频

44 道练习

3,550 XP

460K+

成就证明

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课程描述

现在是时候更进一步，继续提升您的 Python 技能了。Python 拥有大量出色的函数和丰富的模块生态。不过，作为数据从业者或开发者，您经常需要自己编写函数，以解决由数据决定的问题。在本课程中，您将学习编写函数的要领。完成课程后，您将能够编写自定义函数，支持多个参数与多个返回值，并掌握默认参数和可变长度参数。您还将深入理解 Python 的作用域，能够编写 lambda 函数，并在编写函数时处理错误。每一章的结尾，您都会运用新技能来编写用于分析 Twitter 数据的函数。视频包含实时字幕，您可以点击视频左下角的 "Show transcript" 展开查看。课程词汇表位于右侧的资源部分。若要获得 CPE 学分，您需要完成课程并在合格测评中达到 70% 的得分。您可以点击右侧的 CPE 学分提示跳转至测评。

先决条件

Intermediate Python

1

Writing your own functions

You'll learn how to write simple functions, as well as functions that accept multiple arguments and return multiple values. You'll also have the opportunity to apply these new skills to questions commonly encountered by data professionals and developers.

User-defined functions

Strings in Python

Recapping built-in functions

Write a simple function

Single-parameter functions

Functions that return single values

Multiple parameters and return values

Functions with multiple parameters

A brief introduction to tuples

Functions that return multiple values

Bringing it all together

Bringing it all together (1)

Bringing it all together (2)

2

Default arguments, variable-length arguments and scope

You'll learn to write functions with default arguments so that the user doesn't always need to specify them, and variable-length arguments so they can pass an arbitrary number of arguments on to your functions. You'll also learn about the essential concept of scope.

Scope and user-defined functions

Pop quiz on understanding scope

The keyword global

Python's built-in scope

Nested functions

Nested Functions I

Nested Functions II

The keyword nonlocal and nested functions

Default and flexible arguments

Functions with one default argument

Functions with multiple default arguments

Functions with variable-length arguments (*args)

Functions with variable-length keyword arguments (**kwargs)

Bringing it all together

Bringing it all together (1)

Bringing it all together (2)

3

Lambda functions and error-handling

Learn about lambda functions, which allow you to write functions quickly and on the fly. You'll also practice handling errors in your functions, which is an essential skill. Then, apply your new skills to answer data science questions.

Lambda functions

Pop quiz on lambda functions

Writing a lambda function you already know

Map() and lambda functions

Filter() and lambda functions

Reduce() and lambda functions

Introduction to error handling

Pop quiz about errors

Error handling with try-except

Error handling by raising an error

Bringing it all together

Bringing it all together (1)

Bringing it all together (2)

Bringing it all together (3)

Bringing it all together: testing your error handling skills

Python 函数入门

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