pip install from PyPI fails if NumPy not already installed

[mdickinson]

Chaco depends on NumPy, but doesn't declare that dependency in its setup.py.

[corranwebster]

But Chaco does depend on Enable, which does declare a dependency on Numpy, so you shouldn't every be in a situation where you don't have Numpy?

[rkern]

Note that the setup.py uses numpy, so adding it there won't accomplish anything except alleviating some OCD. If the goal is to get pip to work, you'll need a sidecar requirements.txt listing numpy.

[mdickinson]

If the goal is to get pip to work

Sorry, yes, that was indeed the goal. Right now, pip install chaco to install from PyPI fails if NumPy isn't already installed. I should retitle this issue.

I'd argue that numpy should be added to the setup.py anyway as a runtime dependency, so that if one day we manage to produce wheels for Chaco then pip will be able to resolve dependencies properly.

[mdickinson]

But Chaco does depend on Enable, which does declare a dependency on Numpy, so you shouldn't every be in a situation where you don't have Numpy?

Hmm, true. I guess the need to add NumPy to the runtime requirements really is at OCD level, then. :-)

And at that level, I'd say that the general rule is that any package that Chaco imports directly from should be in the requirements.