#python 2.7

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：

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

6/1/17

Thing-A-Day #1126 - Fighting Sim

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.