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Install pyproj error

pyproj is the dependene of geopandas, which is further dependence for some of plotly's mapping functions. When installing the library in Python 3.7, part of the error messages look like:

    /usr/local/Cellar/python/3.7.0/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:238:15: note: 'curexc_traceback' declared here
        PyObject *curexc_traceback;
                  ^
    15 warnings and 15 errors generated.
    error: command 'clang' failed with exit status 1

#137@pyproj shows that this is compatibility issue with Python 3.7. This is already fixed on the latest pyproj library, so one can install from code/ compile from code to solve the issue. And another error appears at this stage:

    _proj.c does not exist in a repository copy.
    ImportError: Cython must be installed in order to generate _proj.c
    	to install Cython run `pip install cython`

Installing Cython can solve the problem. So the complete solution for this issue is:

pip install cython
pip install git+https://github.com/jswhit/pyproj.git
pip install geopandas

More discussion and further questions can go to #87.