Python TIPs

1. pip install jupter

环境：Mac OS

a. pip install jupyter

    Permission denied: '/Libarary/Python/2.7/site=-packages/pyzmq-16.0.2.dist-info'

b. sudo pip install jupyter

    The directory '/Users/zhaoguifu/Library/Caches/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.

    The directory '/Users/zhaoguifu/Library/Caches/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.

c. sudo -H pip --exists-action install jupyter 

    Operation not permitted: '/tmp/pip-3o  ......

d. sudo -H pip --exists-action i install jupyter --user -U

    Done. OK. Successful.

pip install -U --user --force jupyter 

jupyter 导出pif需要安装pandoc，brew install pandoc 。导出的pdf相当perfect。

2. install ipython

    环境： Mac OS，之前可能安装过ipython，但是终端又找不到ipython命令，重复安装也不行，试了好几次都不行。

    最终用如下命令安装：

        pip install -U --user --force ipython

        前提条件：在当前用户目录建立文件：.pydistutils.cfg ，输入如下内容：

        

[global]
verbose=1

[install]
install-scripts=$HOME/bin

[easy_install]
install-scripts=$HOME/bin

    这样，就会在当前用户目录下的bin目录生成可以执行的ipython。把bin目录加入$PATH变量，OK，就可以执行ipython了。