REF: make invocations of python and pytest consistent with the one used/desired python #3208
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It is largely based on patches which are now in debian packaging of nipype. In an effort to upgrade debian distribution from python 2 to 3, there should be better control over which python is actually invoked by the processes. E.g. there could be
python
andpython3
executables, and nipype imported inpython3
. Then all underlying calls should also usepython3
and not just plainpython
. Also Makefile already had provision ($(PYTHON)
variable) to define which python to use but it was not uniformly used. This PR should address those.See individual commits for possibly more comments