背景：
电脑重装后，python也要跟着重装，将安装包、环境变量备份等安装完成后直接安装
重装前
1. pip包备份,命令窗口
1 pip freeze > py2.txt #python2的包 2 pip3 freeze > py3.txt #python3的包
2.环境变量备份,命令窗口
1 set >> D:env.txt
重装后
1.安装python2、3
安装包可以从官网下载，也可以使用网盘中的文件
链接：https://pan.baidu.com/s/1sqejXeezFzU_2XJJtzD_Hw
提取码：f0q3
2.将python3目录下的 python.exe 复制一份，修改成 python3.exe
3.将重装前2中的环境变量中的 python路径加到 环境变量中
1 C:Python27; 2 C:Python27Scripts; 3 C:Python27Libsite-packages; 4 C:Python37; 5 C:Python37Scripts;
4.安装VCForPython27 包，不安装的话 第五步会报错 error: Microsoft Visual C++ 9.0 is required
地址：http://www.microsoft.com/en-us/download/confirmation.aspx?id=44266
直接下载安装 或从重装后步骤1中的网盘中下载
5.安装包
1 pip install -r py2.txt #安装python2的包 2 pip install -r py3.txt #安装python3的包
附录：
自己常用安装包
Python2
1 alembic==0.8.7 2 aniso8601==6.0.0 3 Appium-Python-Client==0.28 4 AppMetrics==0.5.0 5 APScheduler==3.6.1 6 arrow==0.13.1 7 asn1crypto==0.24.0 8 backports-abc==0.5 9 backports.functools-lru-cache==1.5 10 bcrypt==3.1.4 11 beautifulsoup4==4.6.0 12 binaryornot==0.4.4 13 blinker==1.4 14 certifi==2018.4.16 15 cffi==1.11.5 16 chardet==3.0.4 17 click==6.6 18 configparser==3.7.4 19 cookiecutter==1.6.0 20 cookiejar==0.0.2 21 coverage==4.5.1 22 cryptography==2.2.2 23 cycler==0.10.0 24 decorator==4.3.0 25 Django==1.11.20 26 docutils==0.14 27 dominate==2.3.5 28 enum34==1.1.6 29 et-xmlfile==1.0.1 30 Flask==0.11.1 31 Flask-Bootstrap==3.3.7.1 32 Flask-HTTPAuth==3.1.2 33 Flask-JWT==0.3.2 34 Flask-Login==0.4.1 35 Flask-Mail==0.9.1 36 Flask-Migrate==2.0.0 37 Flask-Moment==0.7.0 38 Flask-RESTful==0.3.7 39 Flask-Script==2.0.5 40 Flask-SQLAlchemy==2.1 41 funcsigs==1.0.2 42 future==0.17.1 43 futures==3.2.0 44 hiredis==0.2.0 45 http==0.2 46 idna==2.6 47 ipaddress==1.0.22 48 itsdangerous==0.24 49 jdcal==1.4 50 jieba==0.39 51 Jinja2==2.8 52 jinja2-time==0.2.0 53 jsonpatch==1.23 54 jsonpointer==2.0 55 jwt==0.5.4 56 kitchen==1.2.5 57 kiwisolver==1.1.0 58 livetest==0.5 59 Mako==1.0.4 60 MarkupSafe==0.23 61 matplotlib==2.2.4 62 mock==2.0.0 63 mysql-connector==2.2.9 64 MySQL-python==1.2.5 65 numpy==1.16.4 66 openpyxl==2.6.2 67 pager==3.3 68 paramiko==2.4.1 69 parse==1.8.4 70 passlib==1.7.1 71 payment==0.0.1.2 72 pbr==5.1.3 73 Pillow==6.0.0 74 pluggy==0.6.0 75 poyo==0.4.2 76 py==1.5.3 77 pyasn1==0.4.3 78 pycparser==2.18 79 pycrypto==2.6 80 PyJWT==1.4.2 81 pymongo==3.6.1 82 PyMySQL==0.7.6 83 PyNaCl==1.2.1 84 pyparsing==2.4.0 85 python-dateutil==2.8.0 86 python-editor==1.0.1 87 pytz==2018.9 88 redis==2.10.5 89 redis-py-cluster==1.3.4 90 requests==2.19.0 91 robotframework==3.0.4 92 robotframework-appiumlibrary==1.4.6 93 robotframework-archivelibrary==0.4.0 94 robotframework-databaselibrary==1.0.1 95 robotframework-ftplibrary==1.6 96 robotframework-httplibrary==0.4.2 97 robotframework-mongodblibrary==0.3.4 98 robotframework-redislibrary==0.1 99 robotframework-requests==0.4.7 100 robotframework-ride==1.5.2.1 101 robotframework-selenium2library==3.0.0 102 robotframework-seleniumlibrary==3.1.1 103 robotframework-sshlibrary==3.0.0 104 schedule==0.6.0 105 selenium==3.12.0 106 singledispatch==3.4.0.3 107 six==1.11.0 108 SQLAlchemy==1.0.14 109 tornado==5.1.1 110 tox==3.0.0 111 typing==3.5.3.0 112 tzlocal==2.0.0 113 urllib3==1.23 114 virtualenv==16.0.0 115 visitor==0.1.3 116 waitress==1.1.0 117 webob==1.8.2 118 webtest==2.0.29 119 Werkzeug==0.11.10 120 whichcraft==0.5.2 121 wordcloud==1.5.0 122 WTForms==2.2.1
Python3
1 APScheduler==3.6.0 2 arrow==0.15.4 3 asn1crypto==0.24.0 4 Babel==2.7.0 5 backports.ssl-match-hostname==3.7.0.1 6 bcrypt==3.1.6 7 blinker==1.4 8 certifi==2019.3.9 9 cffi==1.12.3 10 chardet==3.0.4 11 Click==7.0 12 crcmod==1.7 13 cryptography==2.6.1 14 docker==3.7.2 15 docker-pycreds==0.4.0 16 Flask==1.0.2 17 Flask-Babel==0.12.2 18 Flask-Excel==0.0.7 19 Flask-Login==0.4.1 20 Flask-Mail==0.9.1 21 Flask-OAuthlib==0.9.5 22 Flask-Script==2.0.6 23 Flask-Session==0.3.1 24 Flask-SQLAlchemy==2.4.0 25 Flask-WTF==0.14.2 26 geoip2==2.9.0 27 gevent==1.4.0 28 greenlet==0.4.15 29 has==0.0.4 30 idna==2.8 31 ipaddress==1.0.22 32 itsdangerous==1.1.0 33 Jinja2==2.10.1 34 jmespath==0.9.4 35 lml==0.0.9 36 lxml==4.3.4 37 Markdown==2.6.11 38 MarkupSafe==1.1.1 39 maxminddb==1.4.1 40 oauthlib==2.1.0 41 olefile==0.46 42 packaging==19.0 43 paramiko==2.4.2 44 pip-review==1.0 45 pyasn1==0.4.5 46 pycparser==2.19 47 pyexcel==0.5.13 48 pyexcel-io==0.5.17 49 pyexcel-webio==0.1.4 50 PyMySQL==0.9.3 51 PyNaCl==1.3.0 52 pyparsing==2.4.0 53 pypiwin32==223 54 python-dateutil==2.8.1 55 pytz==2019.1 56 pywin32==224 57 requests==2.21.0 58 requests-oauthlib==1.1.0 59 robotframework==3.1.2 60 six==1.12.0 61 SQLAlchemy==1.3.6 62 texttable==1.6.1 63 tzlocal==1.5.1 64 urllib3==1.24.3 65 websocket-client==0.56.0 66 Werkzeug==0.15.2 67 WTForms==2.2.1 68 XMind==1.2.0 69 xmind2testcase==1.3.0