markdown Mac 10.14（Mojave）上的Python3.7设置

Posted 2021-05-05

1) Install Python 3.7.x from <https://www.python.org/downloads/> or via [homebrew](http://brew.sh/). 
```
$ brew install python3   # Installed at /usr/local/Cellar/python3
```
Check that python3 has been installed by running it at the terminal:
```
$ python3
>>> Python 3.7.2
```
2) Download `get-pip.py` from <https://bootstrap.pypa.io/get-pip.py> and install (this should already be installed if python was installed from python.org or homebrew):
```sh
$ curl -O https://bootstrap.pypa.io/get-pip.py
$ sudo python3 get-pip.py
```
3) Install virtualenv and [virtualenvwrapper](http://virtualenvwrapper.readthedocs.io/en/latest/install.html)
```sh
$ sudo -H pip3 install virtualenv
$ sudo -H pip3 install virtualenvwrapper --ignore-installed six
```
4) Add the following to your `~/.bash_profile` to load virtualenvwrapper then run `bash -l`
```sh
# Location of python virtual environments
export WORKON_HOME=$HOME/.virtualenvs

if [ -e /usr/local/bin/virtualenvwrapper.sh ]; then
  source /usr/local/bin/virtualenvwrapper.sh
fi
```
5) Create your virtual enviornment named `py3`
```sh
$ mkvirtualenv --python=`which python3` py3
```

/*
* To install all modules: pip3 install -r requirements.txt
*/

bokeh
Flask
ipython
jupyter
keras
matplotlib
nose
numpy
pandas
Pillow
pymc
requests
scikit-image
scikit-learn
scipy
seaborn
statsmodel
tensorflow

Installing [opencv](http://opencv.org) with python3.7
```sh
$ brew update
$ brew install opencv@3 --with-python3   # Add --with-contrib if you want the contrib modules
$ ln -s /usr/local/Cellar/opencv/3.4.5/lib/python3.7/site-packages/cv2/python-3.7/cv2.cpython-37m-darwin.so /usr/local/lib/python3.7/site-packages/cv2.so
```

You may have to export `PYTHONPATH`:
```sh
export PYTHONPATH=$PYTHONPATH:/usr/local/Cellar/opencv/3.4.5/lib/python3.7/site-packages
```

If you installed a previous version of opencv and no longer need it, remove it:
```
brew cleanup opencv
```

Test:
```
$ python3
In[1]: import cv2
In[2]: cv2.__version__
Out[2]: '3.4.5'
```

Install these modules from Github as their py3 support is currently not published on PyPI.
Their master branch works with Python3.7

Set your locale in an environment variable in `~/.bash_profile`
```sh
export LC_ALL=en_US.UTF-8
export LANG=en_US.UTF-8
```
Type `bash -l` in your terimal to run the updated bash_profile.   
Now, install the modules:

```sh
$ pip3 install git+git://github.com/cython/cython@master
$ pip3 install git+git://github.com/statsmodels/statsmodels
$ pip3 install git+git://github.com/pymc-devs/pymc3
```

```sh
$ brew install llvm
$ brew link llvm --force
$ pip3 install numba
```

Test code from [numba](http://numba.pydata.org)