Try to import Callable from collections.abc (closes #133)

Author: tboggs

.github/workflows/python-package.yml

@@ -5,9 +5,9 @@ name: Unit Tests
 
 on:
   push:
-    branches: [ master ]
+    branches: [ master, develop ]
   pull_request:
-    branches: [ master ]
+    branches: [ master, develop ]
 
 jobs:
   build:
@@ -16,7 +16,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [2.7, 3.6, 3.7, 3.8, 3.9]
+        python-version: [2.7, 3.6, 3.7, 3.8, 3.9, "3.10"]
 
     steps:
     - uses: actions/checkout@v2

spectral/algorithms/transforms.py

@@ -4,7 +4,10 @@
 
 from __future__ import absolute_import, division, print_function, unicode_literals
 
-import collections
+try:
+    from collections.abc import Callable
+except:
+    from collections import Callable
 import numpy as np
 
 
@@ -85,7 +88,7 @@ def __call__(self, X):
         __init__.
         '''
         if not isinstance(X, np.ndarray):
-            if hasattr(X, 'transform') and isinstance(X.transform, collections.Callable):
+            if hasattr(X, 'transform') and isinstance(X.transform, Callable):
                 return X.transform(self)
             else:
                 raise TypeError('Unable to apply transform to object.')

spectral/tests/spytest.py

@@ -4,7 +4,10 @@
 
 from __future__ import absolute_import, division, print_function, unicode_literals
 
-import collections
+try:
+    from collections.abc import Callable
+except:
+    from collections import Callable
 import sys
 
 class SpyTest(object):
@@ -39,7 +42,7 @@ def flush(self):
                 pass
         null = NullStdOut()
         methods = [getattr(self, s) for s in sorted(dir(self)) if s.startswith('test_')]
-        methods = [m for m in methods if isinstance(m, collections.Callable)]
+        methods = [m for m in methods if isinstance(m, Callable)]
         stdout = sys.stdout
         for method in methods:
             print(format('Testing ' + method.__name__.split('_', 1)[-1],