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Python 虚拟环境在 Ubuntu 的安装、管理
首先 pip 才是最通用的 python 包管理工具
安装 pip 的命令:
#apt-get -y install python-pip #pip install --upgrade pip
pip 安装后的路径: /Library/Python/2.7/site-packages/pip-20.0.2-py2.7.egg/pip
1、查看你的系统是否安装virtualenv:
# virtualenv --version
2、安装 Virtualenv 虚拟环境:
# pip install virtualenv
3、创建不同 python 版本的虚拟 python3、Pyhon2 环境:
# virtualenv --python=usr/bin/python3 venv3 # 两种命令格式都可以 # virtualenv -p /usr/bin/python2 venv2 # 两种命令格式都可以 root@jdu4e00u53f7:~# virtualenv You must provide a DEST_DIR Usage: virtualenv [OPTIONS] DEST_DIR Options: --version show program's version number and exit -h, --help show this help message and exit -p PYTHON_EXE, --python=PYTHON_EXE The Python interpreter to use, e.g., --python=python2.5 will use the python2.5 interpreter to create the new environment. The default is the interpreter that virtualenv was installed with (/usr/bin/python)
4、虚拟环境的激活、安装组件:
# source VENV/bin/activate (VENV) root@jdu4e00u53f7:~# pip install django
五、退出虚拟环境
# deactivate
六、删除虚拟环境
# rm -r venv
直接删除虚拟环境所在的文件夹venv就删除了我们创建的venv虚拟环境。
可以使用 pip freeze > requirements.txt 将当前环境中的包的名称及版本导出到文本中 然后在另一个环境中 pip install -r requirements.txt 安装
其次才推荐使用anaconda
1、下载Anaconda3: https://repo.continuum.io/archive/ 根据系统的 Python 版本选择对应的安装包。
2、进入下载目录,打开终端,根据版本输入安装命令:
Python 3.6 version #bash Anaconda3-4.3.1-Linux-x86_64.sh
Python 2.7 version bash Anaconda2-4.3.1-Linux-x86_64.sh
3、安装过程,一直回车即可,当遇到下面的选择,注意输入yes:
Do you wish the installer to prepend the Anaconda2 install location to PATH in your /home/gjq/.bashrc ? [yes|no] [no] >>> yes
4、安装成功
For this change to become active, you have to open a new terminal. Thank you for installing Anaconda2! Share your notebooks and packages on Anaconda Cloud! Sign up for free: https://anaconda.org
5、让.bashrc中添加的路径生效:
source ~/.bashrc
6、测试:
gjq@gjq-virtual-machine:~/Downloads$ python Python 2.7.13 |Anaconda 4.3.1 (64-bit)| (default, Dec 20 2016, 23:09:15) [GCC 4.4.7 20120313 (Red Hat 4.4.7-1)] on linux2 Type "help", "copyright", "credits" or "license" for more information. Anaconda is brought to you by Continuum Analytics. Please check out: http://continuum.io/thanks and https://anaconda.org >>>
出现Anaconda 表示安装成功了!
配置 Anaconda Python2 和 Python3 虚拟环境
安装配置小结:
# 创建一个名为python36的环境,指定Python版本是3.6(不用管是3.6.x,conda会为我们自动寻找3.6.x中的最新版本) conda create --name python36 python=3.6 # 安装好后,使用activate激活某个环境 activate python36 # for Windows source activate python36 # for Linux & Mac # 激活后,会发现terminal输入的地方多了python36的字样,实际上,此时系统做的事情就是把默认2.7环境从PATH中去除,再把3.6对应的命令加入PATH # 此时,再次输入 python --version # 可以得到`Python 3.6.1 :: Continuum Analytics, Inc.`,即系统已经切换到了3.6的环境 # 如果想返回默认的python 2.7环境,运行 deactivate python34 # for Windows source deactivate python34 # for Linux & Mac # 删除一个已有的环境 conda remove --name python36 --all # 其他指令 conda info -e #查看已有的环境 conda remove -n env_name --all #删除环境 conda install -n py27 anaconda #在py27下安装科学计算的包,包很多,慎重选择
创建新的 python 3.6 虚拟环境:
root@jdu4e00u53f7:~# conda create --name python36 python=3.6 Fetching package metadata ......... Solving package specifications: . Package plan for installation in environment /root/anaconda3/envs/python36: The following NEW packages will be INSTALLED: certifi: 2016.2.28-py36_0 openssl: 1.0.2l-0 pip: 9.0.1-py36_1 python: 3.6.2-0 readline: 6.2-2 setuptools: 36.4.0-py36_0 sqlite: 3.13.0-0 tk: 8.5.18-0 wheel: 0.29.0-py36_0 xz: 5.2.3-0 zlib: 1.2.11-0 Proceed ([y]/n)? y
Python 3.8: In addition to a new API for the configuration, the programming language Assignment gets expressions and position-dependent parameters.
Installing and using virtual environment for python 2.7 and python 3.5
Hello friends, AI Sangam (Best Python Company) brings a simple but understandable document on installing virtual environment for python 2.7 and python 3.5. VIrtual environment helps you a lot while running different projects because your files in /usr/local/lib/python remains unaffected and packages are installed in the virtual environment only. Please spare some time to see this document
https://drive.google.com/file/d/1ZOZAw57XccOskV7tL7de6k0aLeuRhhrt/view?usp=sharing
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The beta will not be released until I finish making the graphics. This is literally only level one of the game.
6/1/17
Thing-A-Day #1126 - Fighting Sim
I started to implement a mock D&D fighting thing, and it really sucks and has barely worked for 5 hours and now I’m sad and tired and don’t want to finish it. C’est la vie.
8/15/14
Thing-A-Day #105 - New Word Generator
This Python 2.7 program goes into a file in the same folder called input.txt, and generates statistically similar words to the input. For example, inputting Dr. Martin Luther King Jr.'s I Have a Dream speech gives you something like this:
"wintanthe our whetour of condodee the jayof vonale batound cotin"
Now, there is no punctuation coded into it, so keep that in mind. I may do that in the future though.
If there are any questions (or bugs you find), feel free to send me an ask!