Scrapy啟動報錯invalid syntax

報錯信息

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 “

啟動命令如下：

scrapy crawl first_spider -o first_spider.csv

解決方法

經(jīng)過查詢發(fā)現(xiàn)async在python3.7中是保留字，因此將twisted\conch\manhole.py中的async修改為isasync即可解決問題

使用scrapy做爬蟲遇到的一些坑

使用xpath和CSS遇到的一些 invalid syntax

1.引號的歧義：最外面應(yīng)該使用單引號

錯誤：

正確：把定位的xpath外加單引號

2.使用了關(guān)鍵字做變量

錯誤：

正確：注意關(guān)鍵字不能做變量

3.進入shell窗口時，url添加了“”

錯誤：

正確：去掉url的引號

4.使用xpath匹配相關(guān)信息，返回為空列表

錯誤：因為一開始網(wǎng)址就是錯誤的，所以不管匹配的xpath是不是對的，都會返回【】

正確：

以上為個人經(jīng)驗，希望能給大家一個參考，也希望大家多多支持腳本之家。