目录
- Scrapy启动报错inva编程客栈lid syntax
- 报错信息
- 解决方法
- 使用scrapy做爬虫遇到的一些坑
- 1.引号的歧义:最外面应该使用单引号
- 2.使用了关键字做变量
- 3.进入shell窗口时,url添加了“”
- 4.使用xpath匹配相关信息,返回为空列表
Scrapy启动报错invalid syntax
报错信息
Traceback (most recent call last): File “d:\python\lib\runpy.py”,
line 193, in _run_module_as_main “main”, mod_spec) File “d:\python\lib\runpy.py”, line 85, in run_code exec(code, run_globals) File "D:\python\Scripts\scrapy.exe_main.py", line 9, in File “d:\python\lib\site-packages\scrapy\cmdline.py”, line 150, in execute _run_print_help(parser, _run_command, cmd, args, opts) File “d:\pythonYGmsYHT\lib\site-packages\scrapy\cmdline.py”, line 90, in _run_print_help func(*a, **kw) File “d:\python\lib\site-packages\scrapy\cmdline.py”, line 157, in _run_command cmd.run(args, opts) File “d:\python\lib\site-packages\scrapy\commands\crawl.py”, line 57, in run se编程客栈lf.crawler_process.crawl(spname, **opts.spargs) File “d:\python\lib\site-packages\scrapy\crawler.py”, line 170, in crawl crawler = self.create_crawler(crawler_or_spidercls) File “d:\python\lib\site-packages\scrapy\crawler.py”, line 198, in create_crawler return self._create_crawler(crawler_or_spidercls) File “d:\python\lib\site-packages\scrapy\crawler.py”, line 203, in create_crawler return Crawler(spidercls, self.settings) File “d:\python\lib\site-packages\scrapy\crawler.py”, line 55, in init self.extensions = ExtensionManager.from_crawler(self) File “d:\python\lib\site-packages\scrapy\middleware.py”, line 58, in from_crawler return cls.from_settings(crawler.settings, crawler) File “d:\python\lib\site-packages\scrapy\middleware.py”, line 34, in from_settings mwcls = load_object(clspath) File “d:\pythonhttp://www.cppcns.comlib\site-packages\scrapy\utils\misc.py”, line 44, in load_object mod = import_module(module) File "d:\python\lib\importlib_init.py", line 127, in import_module return _bootstrap._gcd_import(name[level:], package, level) File “
启动命令如下:
scrapy crawl first_spider -o first_spider.csv
解决方法
经过查询发现async在python3.7中是保留字,因此将twisted\conch\manhole.py中的async修改为isasync即可解决问题
使用scrapy做爬虫遇到的一些坑
使用xpath和css遇到的一些 invalid syntax
1.引号的歧义www.cppcns.com:最外面应该使用单引号
错误:
正确:把定位的xpath外加单引号
2.使用了关键字做变量
错误:
正确:注意关键字不能做变量
3.进入shell窗口时,url添加了“”
错误:
正确:去掉url的引号
4.使用xpath匹配相关信息,返回为空列表
错误:因为一开始网址就是错误的,所以不管匹配的xpath是不是对的,都会返回【】
正确:
以上为个人经验,希望能给大家一个参考,也希望大家多多支持我们。
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