mac安装scrapy并创建项目的实例讲解

最近刚好在学习python+scrapy的爬虫技术，因为mac是自带python2.7的，所以安装3.5版本有两种方法，一种是升级，一种是额外安装3.5版本。

升级就不用说了，讲讲额外安装的版本吧~~~

因为python是有自带版本的，最开始安装的时候都会有一种“ 会不会冲突 ”的感觉。

其实安装3.5版本也就是在官网上直接下载之后安装，和普通的mac软件安装方式是一样的~~

https://www.python.org/downloads/release/python-353/

安装完成之后，不会覆盖原来的python，会在 /Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5文件中

在终端直接输入 python 会执行python2.7版本

python  Python 2.7.12 (default, Jun 29 2016, 14:05:02) [GCC 4.2.1 Compatible Apple LLVM 7.3.0 (clang-703.0.31)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> 

在终端直接输入 python3 则会执行python3.5版本

python3  Python 3.5.3 (v3.5.3:1880cb95a742, Jan 16 2017, 08:49:46) [GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> 

接下来就可以开始安装scrapy了

python3.5中会自带 pip，所以不需要额外安装了，可以直接在终端输入 pip3 --version查看版本和路径

pip3 --version  pip 9.0.1 from /Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages (python 3.5) 

使用 pip3 安装scrapy

pip3 install Scrapy 

这里的Scrapy一定要首字母大写，不然会在安装的过程中报错~~

Collecting scrapy Retrying (Retry(total=4, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x103aa2c88>: Failed to establish a new connection: [Errno 61] Connection refused',)': /simple/scrapy/ Retrying (Retry(total=3, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x103aa29e8>: Failed to establish a new connection: [Errno 61] Connection refused',)': /simple/scrapy/ Retrying (Retry(total=2, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x103aa2630>: Failed to establish a new connection: [Errno 61] Connection refused',)': /simple/scrapy/ Retrying (Retry(total=1, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x103aa2f28>: Failed to establish a new connection: [Errno 61] Connection refused',)': /simple/scrapy/ Retrying (Retry(total=0, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x103aa2be0>: Failed to establish a new connection: [Errno 61] Connection refused',)': /simple/scrapy/ Could not find a version that satisfies the requirement scrapy (from versions: )No matching distribution found for scrapy