最近剛好在學習python+scrapy的爬蟲技術，因為mac是自帶python2.7的，所以安裝3.5版本有兩種方法，一種是升級，一種是額外安裝3.5版本。

升級就不用說了，講講額外安裝的版本吧~~~

因為python是有自帶版本的，最開始安裝的時候都會有一種“ 會不會沖突 ”的感覺。

其實安裝3.5版本也就是在官網上直接下載之后安裝，和普通的mac軟件安裝方式是一樣的~~

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

安裝完成之后，不會覆蓋原來的python，會在 /Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5文件中

在終端直接輸入 python 會執行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. >>> 

在終端直接輸入 python3 則會執行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. >>> 

接下來就可以開始安裝scrapy了

python3.5中會自帶 pip，所以不需要額外安裝了，可以直接在終端輸入 pip3 --version查看版本和路徑

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 安裝scrapy

pip3 install Scrapy 

這里的Scrapy一定要首字母大寫，不然會在安裝的過程中報錯~~

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