Python Demo 项目教程

Python Demo 项目教程

python-demo新手用来练手的Python Demo合集,欢迎PR项目地址:https://gitcode.com/gh_mirrors/py/python-demo

项目介绍

Python Demo 项目是一个新手用来练手的 Python Demo 合集,旨在帮助初学者通过实践学习 Python 编程。该项目包含了多个模块,如 Python 基础语法练习、基本算法练习、面向对象编程、网络编程以及 Web 框架等。所有 Demo 都是基于 Python 3.6 及以上版本编写的,并且项目持续更新中。

项目快速启动

下载源码

首先,你需要从 GitHub 上克隆项目到本地:

git clone https://github.com/ylzon/python-demo.git

运行 Demo

进入项目目录并执行相应的 Python 文件:

cd python-demo
python demo.py

应用案例和最佳实践

基础语法练习

通过编写和运行基础语法练习的 Demo,你可以熟悉 Python 的基本语法,例如变量、数据类型、控制结构等。

面向对象编程

通过面向对象编程的 Demo,你可以学习如何定义类和对象,理解继承、多态等面向对象的概念。

网络编程

网络编程的 Demo 可以帮助你理解如何使用 Python 进行网络通信,例如创建简单的客户端和服务器。

Web 框架

Web 框架的 Demo 展示了如何使用 Python 构建 Web 应用,例如使用 Flask 或 Django 框架。

典型生态项目

Flask

Flask 是一个轻量级的 Web 框架,适合快速开发小型 Web 应用。Python Demo 项目中的 Web 框架部分提供了使用 Flask 的示例。

Django

Django 是一个功能强大的 Web 框架,适合开发复杂的 Web 应用。虽然 Python Demo 项目中没有直接包含 Django 的示例,但你可以通过学习 Flask 的示例来理解 Web 框架的基本概念,然后进一步学习 Django。

Requests

Requests 是一个流行的 HTTP 库,用于发送 HTTP 请求。Python Demo 项目中的网络编程部分可能包含使用 Requests 库的示例。

通过这些应用案例和最佳实践,你可以逐步掌握 Python 编程的各个方面,并能够应用到实际项目中。

python-demo新手用来练手的Python Demo合集,欢迎PR项目地址:https://gitcode.com/gh_mirrors/py/python-demo

创作声明:本文部分内容由AI辅助生成(AIGC),仅供参考

文件: import scrapy from demo1.items import Demo1Item import urllib from scrapy import log # BOSS直聘网站爬虫职位 class DemoSpider(scrapy.Spider): # 爬虫名, 启动爬虫时需要的参数*必填 name = 'demo' # 爬取域范围,允许爬虫在这个域名下进行爬取(可选) allowed_domains = ['zhipin.com'] # 爬虫需要的url start_urls = ['https://www.zhipin.com/c101280600/h_101280600/?query=测试'] def parse(self, response): node_list = response.xpath("//div[@class='job-primary']") # 用来存储所有的item字段 # items = [] for node in node_list: item = Demo1Item() # extract() 将xpath对象转换为Unicode字符串 href = node.xpath("./div[@class='info-primary']//a/@href").extract() job_title = node.xpath("./div[@class='info-primary']//a/div[@class='job-title']/text()").extract() salary = node.xpath("./div[@class='info-primary']//a/span/text()").extract() working_place = node.xpath("./div[@class='info-primary']/p/text()").extract() company_name = node.xpath("./div[@class='info-company']//a/text()").extract() item['href'] = href[0] item['job_title'] = job_title[0] item['sa 报错: C:\Users\xieqianyun\AppData\Local\Programs\Python\Python36\python.exe "C:\Users\xieqianyun\PyCharm Community Edition 2019.2.5\helpers\pydev\pydevconsole.py" --mode=client --port=55825 import sys; print('Python %s on %s' % (sys.version, sys.platform)) sys.path.extend(['C:\\Users\\xieqianyun\\demo1', 'C:/Users/xieqianyun/demo1']) Python 3.6.5 (v3.6.5:f59c0932b4, Mar 28 2018, 17:00:18) [MSC v.1900 64 bit (AMD64)] Type 'copyright', 'credits' or 'license' for more information IPython 7.10.0 -- An enhanced Interactive Python. Type '?' for help. PyDev console: using IPython 7.10.0 Python 3.6.5 (v3.6.5:f59c0932b4, Mar 28 2018, 17:00:18) [MSC v.1900 64 bit (AMD64)] on win32 runfile('C:/Users/xieqianyun/demo1/demo1/begin.py', wdir='C:/Users/xieqianyun/demo1/demo1') Traceback (most recent call last): File "C:\Users\xieqianyun\AppData\Local\Programs\Python\Python36\lib\site-packages\IPython\core\interactiveshell.py", line 3319, in run_code exec(code_obj, self.user_global_ns, self.user_ns) File "<ipython-input-2-fc5979762143>", line 1, in <module> runfile('C:/Users/xieqianyun/demo1/demo1/begin.py', wdir='C:/Users/xieqianyun/demo1/demo1') File "C:\Users\xieqianyun\PyCharm Community Edition 2019.2.5\helpers\pydev\_pydev_bundle\pydev_umd.py", line 197, in runfile pydev_imports.execfile(filename, global_vars, local_vars) # execute the script File "C:\Users\xieqianyun\PyCharm Community Edition 2019.2.5\helpers\pydev\_pydev_imps\_pydev_execfile.py", line 18, in execfile exec(compile(contents+"\n", file, 'exec'), glob, loc) File "C:/Users/xieqianyun/demo1/demo1/begin.py", line 3, in <module> cmdline.execute('scrapy crawl demo'.split()) File "C:\Users\xieqianyun\AppData\Local\Programs\Python\Python36\lib\site-packages\scrapy\cmdline.py", line 145, in execute cmd.crawler_process = CrawlerProcess(settings) File "C:\Users\xieqianyun\AppData\Local\Programs\Python\Python36\lib\site-packages\scrapy\crawler.py", line 267, in __init__ super(CrawlerProcess, self).__init__(settings) File "C:\Users\xieqianyun\AppData\Local\Programs\Python\Python36\lib\site-packages\scrapy\crawler.py", line 145, in __init__ self.spider_loader = _get_spider_loader(settings) File "C:\Users\xieqianyun\AppData\Local\Programs\Python\Python36\lib\site-packages\scrapy\crawler.py", line 347, in _get_spider_loader return loader_cls.from_settings(settings.frozencopy()) File "C:\Users\xieqianyun\AppData\Local\Programs\Python\Python36\lib\site-packages\scrapy\spiderloader.py", line 61, in from_settings return cls(settings) File "C:\Users\xieqianyun\AppData\Local\Programs\Python\Python36\lib\site-packages\scrapy\spiderloader.py", line 25, in __init__ self._load_all_spiders() File "C:\Users\xieqianyun\AppData\Local\Programs\Python\Python36\lib\site-packages\scrapy\spiderloader.py", line 47, in _load_all_spiders for module in walk_modules(name): File "C:\Users\xieqianyun\AppData\Local\Programs\Python\Python36\lib\site-packages\scrapy\utils\misc.py", line 73, in walk_modules submod = import_module(fullpath) File "C:\Users\xieqianyun\AppData\Local\Programs\Python\Python36\lib\importlib\__init__.py", line 126, in import_module return _bootstrap._gcd_import(name[level:], package, level) File "<frozen importlib._bootstrap>", line 994, in _gcd_import File "<frozen importlib._bootstrap>", line 971, in _find_and_load File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 665, in _load_unlocked File "<frozen importlib._bootstrap_external>", line 678, in exec_module File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed File "C:\Users\xieqianyun\demo1\demo1\spiders\demo.py", line 4, in <module> from scrapy import log ImportError: cannot import name 'log'
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