Scrapy启动报错invalid syntax的解决

• scrapy启动报错invalid syntax

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:\python\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
self.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:\python\lib\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：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。