使用Appium，通常需要使用一种language的client，如果使用python，你就需要安装python_client。
下载后，源码中README会告诉你：
3. Install from source via [GitHub](https://github.com/appium/python-client).
```shell
git clone [email protected]:appium/python-client.git
cd python-client
python setup.py install
```
那么setup过程到底是怎么样的呢？我们来分析一下安装过程的log:
running install
running bdist_egg
running egg_info
writing requirements to Appium_Python_Client.egg-info/requires.txt
writing Appium_Python_Client.egg-info/PKG-INFO
writing top-level names to Appium_Python_Client.egg-info/top_level.txt
writing dependency_links to Appium_Python_Client.egg-info/dependency_links.txt
reading manifest file 'Appium_Python_Client.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
writing manifest file 'Appium_Python_Client.egg-info/SOURCES.txt'
installing library code to build/bdist.linux-x86_64/egg
running install_lib
running build_py
上面做一些初始化操作，启动python打包工具，设置一些初始化文件。
copying appium/webdriver/unit_test.py -> build/lib.linux-x86_64-2.7/appium/webdriver
然后会把appium下的python代码备份到build下，在那下面在进行编译，打包。
由于我这里先前已经setup过一次，这里是添加了一个unit_test.py文件，所以只看到这么一个信息。
creating build/bdist.linux-x86_64/egg
creating build/bdist.linux-x86_64/egg/appium
在build下的bdist.linux-x86_64目录创建一些文件夹，把lib.linux-x86_64-2.7备份到其中。
下面就是备份的过程：
copying build/lib.linux-x86_64-2.7/appium/saucetestcase.py -> build/bdist.linux-x86_64/egg/appium
creating build/bdist.linux-x86_64/egg/appium/common
copying build/lib.linux-x86_64-2.7/appium/common/exceptions.py -> build/bdist.linux-x86_64/egg/appium/common
copying build/lib.linux-x86_64-2.7/appium/common/__init__.py -> build/bdist.linux-x86_64/egg/appium/common
copying build/lib.linux-x86_64-2.7/appium/__init__.py -> build/bdist.linux-x86_64/egg/appium
creating build/bdist.linux-x86_64/egg/appium/webdriver
copying build/lib.linux-x86_64-2.7/appium/webdriver/switch_to.py -> build/bdist.linux-x86_64/egg/appium/webdriver
copying build/lib.linux-x86_64-2.7/appium/webdriver/mobilecommand.py -> build/bdist.linux-x86_64/egg/appium/webdriver
copying build/lib.linux-x86_64-2.7/appium/webdriver/connectiontype.py -> build/bdist.linux-x86_64/egg/appium/webdriver
copying build/lib.linux-x86_64-2.7/appium/webdriver/unit_test.py -> build/bdist.linux-x86_64/egg/appium/webdriver
creating build/bdist.linux-x86_64/egg/appium/webdriver/common
copying build/lib.linux-x86_64-2.7/appium/webdriver/common/mobileby.py -> build/bdist.linux-x86_64/egg/appium/webdriver/common
copying build/lib.linux-x86_64-2.7/appium/webdriver/common/__init__.py -> build/bdist.linux-x86_64/egg/appium/webdriver/common
copying build/lib.linux-x86_64-2.7/appium/webdriver/common/multi_action.py -> build/bdist.linux-x86_64/egg/appium/webdriver/common
copying build/lib.linux-x86_64-2.7/appium/webdriver/common/touch_action.py -> build/bdist.linux-x86_64/egg/appium/webdriver/common
copying build/lib.linux-x86_64-2.7/appium/webdriver/webdriver.py -> build/bdist.linux-x86_64/egg/appium/webdriver
copying build/lib.linux-x86_64-2.7/appium/webdriver/__init__.py -> build/bdist.linux-x86_64/egg/appium/webdriver
copying build/lib.linux-x86_64-2.7/appium/webdriver/webelement.py -> build/bdist.linux-x86_64/egg/appium/webdriver
copying build/lib.linux-x86_64-2.7/appium/webdriver/errorhandler.py -> build/bdist.linux-x86_64/egg/appium/webdriver
编译/bdist.linux-x86_64下的文件，并打包成生Appium_Python_Client-0.17-py2.7.egg文件。
然后删除build/bdist.linux-x86_64/egg下的所有文件。
用生成的Appium_Python_Client-0.17-py2.7.egg替换/usr/local/lib/python2.7/dist-packages下的原文件
byte-compiling build/bdist.linux-x86_64/egg/appium/saucetestcase.py to saucetestcase.pyc
byte-compiling build/bdist.linux-x86_64/egg/appium/common/exceptions.py to exceptions.pyc
byte-compiling build/bdist.linux-x86_64/egg/appium/common/__init__.py to __init__.pyc
byte-compiling build/bdist.linux-x86_64/egg/appium/__init__.py to __init__.pyc
byte-compiling build/bdist.linux-x86_64/egg/appium/webdriver/switch_to.py to switch_to.pyc
byte-compiling build/bdist.linux-x86_64/egg/appium/webdriver/mobilecommand.py to mobilecommand.pyc
byte-compiling build/bdist.linux-x86_64/egg/appium/webdriver/connectiontype.py to connectiontype.pyc
byte-compiling build/bdist.linux-x86_64/egg/appium/webdriver/unit_test.py to unit_test.pyc
byte-compiling build/bdist.linux-x86_64/egg/appium/webdriver/common/mobileby.py to mobileby.pyc
byte-compiling build/bdist.linux-x86_64/egg/appium/webdriver/common/__init__.py to __init__.pyc
byte-compiling build/bdist.linux-x86_64/egg/appium/webdriver/common/multi_action.py to multi_action.pyc
byte-compiling build/bdist.linux-x86_64/egg/appium/webdriver/common/touch_action.py to touch_action.pyc
byte-compiling build/bdist.linux-x86_64/egg/appium/webdriver/webdriver.py to webdriver.pyc
byte-compiling build/bdist.linux-x86_64/egg/appium/webdriver/__init__.py to __init__.pyc
byte-compiling build/bdist.linux-x86_64/egg/appium/webdriver/webelement.py to webelement.pyc
byte-compiling build/bdist.linux-x86_64/egg/appium/webdriver/errorhandler.py to errorhandler.pyc
creating build/bdist.linux-x86_64/egg/EGG-INFO
copying Appium_Python_Client.egg-info/PKG-INFO -> build/bdist.linux-x86_64/egg/EGG-INFO
copying Appium_Python_Client.egg-info/SOURCES.txt -> build/bdist.linux-x86_64/egg/EGG-INFO
copying Appium_Python_Client.egg-info/dependency_links.txt -> build/bdist.linux-x86_64/egg/EGG-INFO
copying Appium_Python_Client.egg-info/requires.txt -> build/bdist.linux-x86_64/egg/EGG-INFO
copying Appium_Python_Client.egg-info/top_level.txt -> build/bdist.linux-x86_64/egg/EGG-INFO
zip_safe flag not set; analyzing archive contents...
creating 'dist/Appium_Python_Client-0.17-py2.7.egg' and adding 'build/bdist.linux-x86_64/egg' to it
removing 'build/bdist.linux-x86_64/egg' (and everything under it)
Processing Appium_Python_Client-0.17-py2.7.egg
Removing /usr/local/lib/python2.7/dist-packages/Appium_Python_Client-0.17-py2.7.egg
Copying Appium_Python_Client-0.17-py2.7.egg to /usr/local/lib/python2.7/dist-packages
Appium-Python-Client 0.17 is already the active version in easy-install.pth
Installed /usr/local/lib/python2.7/dist-packages/Appium_Python_Client-0.17-py2.7.egg
安装完成后，还需要处理一下该客户端的一些依赖文件。
Processing dependencies for Appium-Python-Client==0.17
Searching for enum34==1.0.4
Best match: enum34 1.0.4
Processing enum34-1.0.4-py2.7.egg
enum34 1.0.4 is already the active version in easy-install.pth
Using /usr/local/lib/python2.7/dist-packages/enum34-1.0.4-py2.7.egg
Searching for selenium==2.47.1
Best match: selenium 2.47.1
Processing selenium-2.47.1-py2.7.egg
selenium 2.47.1 is already the active version in easy-install.pth
Using /usr/local/lib/python2.7/dist-packages/selenium-2.47.1-py2.7.egg
Finished processing dependencies for Appium-Python-Client==0.17