001-python basic-python installation and upgrade

One, under Windows installation 1.1 python download

2. [python下载]( https://www.python.org/downloads/）
3. 选择可执行文件( 64位3.5.2Windows x86-64 executable installer或32位3.5.2 Windows x86 executable installer)、 ( 64-bit 2.7.12 Windows x86-64 MSI installer or 32-bit 2.7 .12 Windows x86 MSI installer)

1.2Python installation (includes Python2 and Python3)

2. 推荐安装路径为C:\Python27和C:\Python35，因为如果路径有空格的话（C:\Program Files\Python35）pip可能会有问题.
4. 将C:\Python35\python.exe修改为python3.exe，C:\Python35\Scripts\pip.exe改为pip3.exe，如果已经有pip3.exe，就把pip.exe删除。
6. 以后需要使用Python3的环境就在终端输入python3就行（输入python就是python2.7的环境），同理pip3就是使用python3的pip
8. 上面改好之后pip可能会出问题(终端输入>pip3 报错如下：Fatal error in launcher: Unable to create process using ‘"‘)，需要升级一下对应的pip3(终端输入>python3 -m pip install -U pip)

1.3 about Pip

With regard to pip, Python, similar to previous versions of Yum, may also have a single pip, and Python now comes with Pip, without having to install the PIP separately.

1.4 Configuring Environment variables

" right-click Computer "-< Span class= "hljs-literal" >-- - "Advanced system settings" - --- "Environment variable" -- "found in the second content box - ->  "Python installation directory appended to the variable value,                  /span>        

II. Install Python under Linux

　　无需安装，原装Python环境. ps：如果自带2.6，请更新至2.7

Third, upgrade Python under Windows

Unloading load can be.

Iv. updating Python under Linux

Linux Yum relies on its own python, to prevent errors, the update here is actually to install a python.

　　

1 View the default Python version2Python-V3   4 1, installing GCC for compiling python source code5     Yum Install GCC6 2, download source package, https://www.python.org/ftp/python/7 3, unzip and enter the source file8 4, compiling and installing9./ConfigureTen      Make All One      Make Install A 5, view version -/usr/local/bin/python2.7-V - 6, modify the default Python version the     MV/usr/bin/python/usr/bin/python2.6 -     LN-s/usr/local/bin/python2.7/usr/bin/python - 7, prevent Yum from executing exceptions, and modify the Python version used by Yum -     VI/usr/bin/Yum +Change the head #!/usr/bin/python to #!/usr/bin/python2.6

 

001-python basic-python installation and upgrade