not really sure why this didn't give me troubles before but it does now:

reproin@59965c6fd52f:/$ /usr/bin/heudiconv
Traceback (most recent call last):
  File "/usr/bin/heudiconv", line 6, in <module>
    from pkg_resources import load_entry_point
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 3019, in <module>
    @_call_aside
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 3003, in _call_aside
    f(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 3032, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 657, in _build_master
    return cls._build_from_requirements(__requires__)
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 670, in _build_from_requirements
    dists = ws.resolve(reqs, Environment())
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 849, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'pytest>=3.6' distribution was not found and is required by nipype

• I do not think pytest must be a runtime requirement
• I do not know if there is any negative side-effect (e.g. some unguarded import of nipype at runtime)

How did you install that the dependencies weren't installed?

pytest is in the main dependencies because the following is expected to work out-of-the-box:

import nipype
nipype.test()

Related: #2680.

Eh, nevermind. I think this makes sense. We do perform an import check in nipype.test:

	try:
	import pytest
	except:
	raise RuntimeError(
	'py.test not installed, run: pip install pytest')

@satra Any objections?

Codecov Report

Merging #2850 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2850      +/-   ##
==========================================
- Coverage   67.47%   67.45%   -0.03%     
==========================================
  Files         341      341              
  Lines       43362    43362              
  Branches     5379     5379              
==========================================
- Hits        29257    29248       -9     
- Misses      13409    13417       +8     
- Partials      696      697       +1

Flag	Coverage Δ
#smoketests	50.53% <ø> (ø)	⬆️
#unittests	64.88% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
nipype/pipeline/plugins/legacymultiproc.py	61.5% <0%> (-4.5%)	⬇️

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For completeness, in my case it was a reproin docker image, which installed python-nipype debian package. pytest I believe is recommended but not strict dependency.

oh, got merged already... just wanted to push more ;) will do in a new PR.