安裝scrapy,以及出現的錯誤解決。
阿新 • • 發佈:2018-03-13
scrapy首先我是在python3的環境上面完成的。我保留了python2的版本,然後安裝python3的版本。然後在安裝scrapy的過程中出現的錯誤,以及切換python版本後出現的錯誤。
一、安裝python3
一、安裝python3
cd /usr/local/src/ wget https://www.python.org/ftp/python/3.4.2/Python-3.4.2.tgz tar -xf Python-3.4.2.tgz cd Python-3.4.2 ./configure --prefix=/usr/local/python3 make && make install ##將python做一個備份,然後把python3的建立一個軟連接 mv /usr/bin/python /usr/bin/pythonbak ln -fs /usr/local/python3/bin/python3 /usr/bin/python 再在終端進入python交互模式,出現的是python3了。 [root@lsf ~]# python Python 3.4.2 (default, Mar 13 2018, 11:37:48) [GCC 4.8.5 20150623 (Red Hat 4.8.5-16)] on linux Type "help", "copyright", "credits" or "license" for more information. ##python升級到3後,yum無法正常使用,此時需要改一個文件 [root@lsf ~]# cat /usr/bin/yum #!/usr/bin/python2.7 將第一行改為python2.7
二、安裝scrapy
##建立pip3的軟連接 ln -fs /usr/local/python3/bin/pip3 /usr/bin/pip3 ##yum安裝依賴包,可以解決編譯過程中出現的許多錯誤 yum install -y gcc openssl-devel libxml2-devel libxslt-devel bzip2-devel bzip2* libffi-devel python-devel openssl-devel pycrypto ##用pip3安裝 pip3 install twisted --upgrade pip3 install cryptography pycrypto ##安裝scrapy pip3 install scrapy ##建立scrapy軟連接 ln -fs /usr/local/python3/bin/scrapy /usr/bin/scrapy
三、測試scrapy命令
[root@lsf ~]# scrapy Scrapy 1.5.0 - no active project Usage: scrapy <command> [options] [args] Available commands: bench Run quick benchmark test fetch Fetch a URL using the Scrapy downloader genspider Generate new spider using pre-defined templates runspider Run a self-contained spider (without creating a project) settings Get settings values shell Interactive scraping console startproject Create new project version Print Scrapy version view Open URL in browser, as seen by Scrapy [ more ] More commands available when run from project directory Use "scrapy <command> -h" to see more info about a command ##創建一個scrapy項目 scrapy startproject myfirstpjt ##可能會報錯ImportError: cannot import name ‘certificate_transparency‘ pip3 install pip3 --upgrade ##再次安裝scrapy pip3 install scrapy ##創建項目成功後,會出現下面的文件 [root@lsf test_scrapy]# cd myfirstpjt/ [root@lsf myfirstpjt]# ls myfirstpjt scrapy.cfg [root@lsf myfirstpjt]# cd myfirstpjt/ [root@lsf myfirstpjt]# ls __init__.py items.py middlewares.py pipelines.py __pycache__ settings.py spiders
然後就可以直接使用scrapy命令進行項目管理了。
安裝scrapy,以及出現的錯誤解決。