Test report by @Flamefire

Overview of tested easyconfigs (in order)

• **FAIL (unhandled exception: must be type, not None)Traceback (most recent call last):
  File "/home/h3/s3248973/.local/EasyBuildDev/easybuild-framework/easybuild/main.py", line 118, in build_and_install_software
  (ec_res['success'], app_log, err) = build_and_install_one(ec, init_env)
  File "/home/s3248973/.local/EasyBuildDev/easybuild-framework/easybuild/framework/easyblock.py", line 3697, in build_and_install_one
  result = app.run_all_steps(run_test_cases=run_test_cases)
  File "/home/s3248973/.local/EasyBuildDev/easybuild-framework/easybuild/framework/easyblock.py", line 3585, in run_all_steps
  self.run_step(step_name, step_methods)
  File "/home/s3248973/.local/EasyBuildDev/easybuild-framework/easybuild/framework/easyblock.py", line 3438, in run_step
  step_method(self)()
  File "/home/s3248973/.local/EasyBuildDev/easybuild-easyblocks/easybuild/easyblocks/generic/pythonbundle.py", line 128, in extensions_step
  super(PythonBundle, self).extensions_step(*args, **kwargs)
  File "/home/s3248973/.local/EasyBuildDev/easybuild-framework/easybuild/framework/easyblock.py", line 2402, in extensions_step
  self.init_ext_instances()
  File "/home/s3248973/.local/EasyBuildDev/easybuild-framework/easybuild/framework/easyblock.py", line 2332, in init_ext_instances
  inst = cls(self, ext)
  File "/tmp/easybuild-tmp/included-easyblocks-iBqB1u/easybuild/easyblocks/tensorflow.py", line 239, in init
  super(EB_TensorFlow, self).init(*args, **kwargs)
  File "/tmp/easybuild-tmp/included-easyblocks-iBqB1u/easybuild/easyblocks/generic/pythonpackage.py", line 278, in init
  super(PythonPackage, self).init(*args, **kwargs)
  TypeError: must be type, not None
  ** TensorFlow-2.5.0-fosscuda-2019b-Python-3.7.4.eb

Build succeeded for 0 out of 1 (1 easyconfigs in total)
taurusa5 - Linux centos linux 7.7.1908, x86_64, Intel(R) Xeon(R) CPU E5-2603 v4 @ 1.70GHz (broadwell), Python 2.7.5
See https://gist.github.com/7cb9295fbae7ab03d2ec92e9ac64e343 for a full test report.

@Flamefire w.r.t. the initial failures with tracebacks, it seems you got around that by splitting the PR, isolating the modified easyblocks. Off the top of my head, this may be related to the cleaning up after verify_imports, and possibly with the fact that the two modified easyblocks were related by inheritance, but I'm not sure

can you please open an issue with more information on this?

Test report by @Flamefire

Overview of tested easyconfigs (in order)

• SUCCESS TensorFlow-2.5.0-fosscuda-2019b-Python-3.7.4.eb

Build succeeded for 1 out of 1 (1 easyconfigs in total)
taurusa5 - Linux centos linux 7.7.1908, x86_64, Intel(R) Xeon(R) CPU E5-2603 v4 @ 1.70GHz (broadwell), Python 2.7.5
See https://gist.github.com/ea24d525c478a8d6326bb4655f7906b6 for a full test report.

just for completeness sake, this refers to the wrapper introduced in easybuilders/easybuild-framework#3732

Going in, thanks @Flamefire!