add more explanations to the workarounds

omas/tests/test_omas_examples.py

@@ -97,6 +97,10 @@ def test_uncertain(self):
 
     @unittest.skipIf(failed_OMFIT, str(failed_OMFIT))
     def test_plot_g_s_2_ip(self):
+        # on 3.7 this test raises:
+        # ValueError: Number of rows must be a positive integer, not 7.0
+        # It seems like this is caused by a bug in omfit_classes where a float
+        # instead of int is passed to plot
         if sys.version_info.minor==7:
             raise unittest.SkipTest("Avoid Py 3.7 omfit_classes bug.")
         from omas.examples import plot_g_s_2_ip

setup.py

@@ -1,5 +1,4 @@
 import os
-import sys
 import glob
 import subprocess
 
@@ -19,6 +18,8 @@
     'setuptools>=41.2',
     'tqdm',
     'Cython',
+    # latest xarray version that works with 3.7 doesn't work
+    # with importlib_metadata >5 since they deprecated the `get()` method on Entrypoints
     "importlib_metadata <5;python_version=='3.7'"
 ]