安裝Scrapy遇到的坑unable to find vcvarsall.bat

1.pip install pywin32 2.pip install pyOpenSSL 3.pip install lxml 4.pip install Scrapy 報錯：python: can’t open file ‘setup.py’:[Errno 2]No such file or directory 找到setup.py的路徑，用DOS命令cd到setup.py所在的文件夾下，運行

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