fix: restore proper AppVeyor builds (#697)

appveyor.yml

@@ -8,6 +8,7 @@ environment:
 
   global:
     PIP_CACHE_DIR: "pip_cache"
+    PIP_DISABLE_PIP_VERSION_CHECK: "yes"
 
   matrix:
     - PYTHON: "C:\\Miniconda-x64"

cobra/test/test_solver_model.py

@@ -467,12 +467,12 @@ def test_reaction_imul(self, model):
         with model:
             model.reactions.EX_glc__D_e *= 100
             assert model.constraints.glc__D_e.expression.coeff(
-                model.variables.EX_glc__D_e) == -100
+                model.variables.EX_glc__D_e) == -100.0
             assert model.reactions.EX_glc__D_e.reaction == \
                 '100.0 glc__D_e <=> '
 
         assert model.constraints.glc__D_e.expression.coeff(
-            model.variables.EX_glc__D_e) == -1
+            model.variables.EX_glc__D_e) == -1.0
         assert model.reactions.EX_glc__D_e.reaction == 'glc__D_e <=> '
 
         with model:

cobra/util/version_info.py

@@ -10,7 +10,7 @@
 
 import platform
 
-import pip
+import pkg_resources
 
 __all__ = ("show_versions",)
 
@@ -55,7 +55,7 @@ def get_pkg_info():
     # using requirements files that can be read in.
     dependencies = frozenset(PKG_ORDER)
     blob = dict()
-    for dist in pip.get_installed_distributions():
+    for dist in pkg_resources.working_set:
         if dist.project_name in dependencies:
             blob[dist.project_name] = dist.version
     return blob