Python在windows平台的多版本配置！

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​ python在windows平台的环境变量以及多版本配置 ，以及pycharm如何安装包，以及安装包出错时如何排查。

1.python环境变量

官网下载：

https://www.python.org/downloads/windows/

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当前有两个主要版本，两个我们都下载一下，因为有的程序是苦于python2.7开发的，如果有3.7的话，会报错。

python支持多环境配置 。只需要简单的调整一下就可以了。

2.python windows版本的区别

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<input class="pgc-img-caption-ipt" placeholder="图片描述(最多50字)" value="" style="box-sizing: border-box; outline: 0px; color: rgb(102, 102, 102); position: absolute; left: 187.5px; transform: translateX(-50%); padding: 6px 7px; max-width: 100%; width: 375px; text-align: center; cursor: text; font-size: 12px; line-height: 1.5; background-color: rgb(255, 255, 255); background-image: none; border: 0px solid rgb(217, 217, 217); border-radius: 4px; transition: all 0.2s cubic-bezier(0.645, 0.045, 0.355, 1) 0s;"></tt-image>

带x86的是windows 32位 , 带x86-64的表示 64位机器上安装 。

embeddable 表示嵌入式机子

executable:可执行安装包

web-based :网络安装

3.查看环境变量

安装成功以后，查看环境变量，如果安装的时候勾选了添加到环境path中，则是自动加入到用户的环境变量path中的

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<input class="pgc-img-caption-ipt" placeholder="图片描述(最多50字)" value="" style="box-sizing: border-box; outline: 0px; color: rgb(102, 102, 102); position: absolute; left: 187.5px; transform: translateX(-50%); padding: 6px 7px; max-width: 100%; width: 375px; text-align: center; cursor: text; font-size: 12px; line-height: 1.5; background-color: rgb(255, 255, 255); background-image: none; border: 0px solid rgb(217, 217, 217); border-radius: 4px; transition: all 0.2s cubic-bezier(0.645, 0.045, 0.355, 1) 0s;"></tt-image>

<pre spellcheck="false" style="box-sizing: border-box; margin: 5px 0px; padding: 5px 10px; border: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-weight: 400; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: inherit; vertical-align: baseline; cursor: text; counter-reset: list-1 0 list-2 0 list-3 0 list-4 0 list-5 0 list-6 0 list-7 0 list-8 0 list-9 0; background-color: rgb(240, 240, 240); border-radius: 3px; white-space: pre-wrap; color: rgb(34, 34, 34); letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;">D:\Programs\Python\Python37\Scripts;D:\Programs\Python\Python37;
</pre>

2.7的版本也是类似这样的安装 。如果安装了双版本，担心cmd下直接输入 pathon不知道是哪个，可以把pathon2中的pathon.exe给改个名字。同时也要改环境变量的名字

pathon2.7的环境变量默认是写在系统变量中的path中的。

D:ProgramsPythonPython27;D:ProgramsPythonPython27Scripts;

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为了统一，我把他都放到用户变量中了。

4. 测试环境变量是否安装成功 。

把python2中的python.exe 改名为python2.exe

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<input class="pgc-img-caption-ipt" placeholder="图片描述(最多50字)" value="" style="box-sizing: border-box; outline: 0px; color: rgb(102, 102, 102); position: absolute; left: 187.5px; transform: translateX(-50%); padding: 6px 7px; max-width: 100%; width: 375px; text-align: center; cursor: text; font-size: 12px; line-height: 1.5; background-color: rgb(255, 255, 255); background-image: none; border: 0px solid rgb(217, 217, 217); border-radius: 4px; transition: all 0.2s cubic-bezier(0.645, 0.045, 0.355, 1) 0s;"></tt-image>

5.pycharm如何选择python版本

新建项目的时候可以在base interpreter中选择，也可以选择existing interpreter中选择已经存在的。

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6.pycharm中打开的项目如何切换python版本

File-Setting-project-project interpreter 中选择。

如果要安装新的package可以直接点右边的+号进行安装 。

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7.安装easytrader包。

这里要注意，当你安装不上的的时候，有可能 不是包的问题，特别是把pip 源换到国内镜像的时候，要去源上面查一下，下载的版本，国内镜像上有没有。 如果没有，最好还是国外镜像。 或者默认的镜 像

像这个Easytrader默认是版本是18了。但是国内的镜 像只只更新到9.这就是导致 无法成功下载的原因。

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8.如何检查镜像中是否存在包 ：

默认源： https://pypi.org/simple/ 在这里搜索你要下载的包，然后点进去你会发现最新版本是匹配的

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国内镜像就拿清华大学来说，只更新到0.9，所以我们要确认问题的根本。才能更快的解决问题

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