Pip install fails when numpy is not installed

[pypae]

pip install git+git://github.com/uzhdag/pathpy.git fails with error message:

ERROR: Complete output from command python setup.py egg_info:
    ERROR: Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "C:\Users\patrick\AppData\Local\Temp\pip-req-build-rc8ef3uw\setup.py", line 7, in <module>
        from pathpy import __version__
      File "C:\Users\patrick\AppData\Local\Temp\pip-req-build-rc8ef3uw\pathpy\__init__.py", line 10, in <module>
        from .classes import *
      File "C:\Users\patrick\AppData\Local\Temp\pip-req-build-rc8ef3uw\pathpy\classes\__init__.py", line 5, in <module>
        from .paths import Paths
      File "C:\Users\patrick\AppData\Local\Temp\pip-req-build-rc8ef3uw\pathpy\classes\paths.py", line 30, in <module>
        import numpy as np
    ModuleNotFoundError: No module named 'numpy'
    ----------------------------------------
ERROR: Command "python setup.py egg_info" failed with error code 1 in C:\Users\patrick\AppData\Local\Temp\pip-req-build-rc8ef3uw\

This is caused by setup.py importing __version__ from the package directly and therefore loading numpy which is not yet installed.

Could use a sperate file __version__.py with a __version__ variable and then load it like:

here = os.path.abspath(os.path.dirname(__file__))

with open(os.path.join(here, NAME, '__version__.py')) as f:
    exec(f.read(), about)
...
setup(
  ...
  version = about['__version__']
  ...
)

To avoid loading dependencies before they are actually installed.

[verginer]

Hi @PatDue, nice catch! I will look into it.
However the proposed solution would make the root directory even more cluttered and I would like to avoid it. As you have already pointed out, the error can be avoided by installing numpy before pathpy, which I think we should just add in the setup instructions.

L