From d23ee2902e9e9aeffec86cbdb7a392d71be70861 Mon Sep 17 00:00:00 2001
From: slorg1 <slorg1@gmail.com>
Date: Tue, 16 Apr 2019 14:13:52 -0400
Subject: [PATCH] + upgrade to use collections.abc as needed for python 3.6+

--- a/src/contracts/library/map.py
+++ b/src/contracts/library/map.py
@@ -1,7 +1,11 @@
 from ..interface import Contract, ContractNotRespected
 from ..syntax import (W, contract_expression, O, S, add_contract, add_keyword,
     Keyword)
-import collections
+
+try:
+    import collections.abc as collectionsAbc  # python 3.6+
+except ImportError:
+    import collections as collectionsAbc
 
 
 class Map(Contract):
@@ -13,7 +17,7 @@ def __init__(self, length=None, key_c=None, value_c=None, where=None):
         self.value_c = value_c
 
     def check_contract(self, context, value, silent):
-        if not isinstance(value, collections.Mapping):
+        if not isinstance(value, collectionsAbc.Mapping):
             error = 'Expected a Mapping, got %r.' % value.__class__.__name__
             raise ContractNotRespected(contract=self, error=error,
                                        value=value, context=context)
--- a/src/contracts/library/miscellaneous_aliases.py
+++ b/src/contracts/library/miscellaneous_aliases.py
@@ -1,12 +1,16 @@
-import collections
-
+try:
+    import collections.abc as collectionsAbc  # python 3.6+
+except ImportError:
+    import collections as collectionsAbc
 
 
 def ist(C):
+
     def f(x):
         f.__name__ = 'isinstance_of_%s' % C.__name__
         if not isinstance(x, C):
             raise ValueError('Value is not an instance of %s.' % C.__name__)
+
     return f
 
 
@@ -14,33 +18,32 @@ def m_new_contract(name, f):
     from contracts.library.extensions import CheckCallable
     from contracts.library.extensions import Extension
     Extension.registrar[name] = CheckCallable(f)
-    
 
-m_new_contract('Container', ist(collections.Container))
-# todo: Iterable(x)
-m_new_contract('Iterable', ist(collections.Iterable))
-
-m_new_contract('Hashable', ist(collections.Hashable))
 
+m_new_contract('Container', ist(collectionsAbc.Container))
+# todo: Iterable(x)
+m_new_contract('Iterable', ist(collectionsAbc.Iterable))
 
+m_new_contract('Hashable', ist(collectionsAbc.Hashable))
 
-m_new_contract('Iterator', ist(collections.Iterator))
-m_new_contract('Sized', ist(collections.Sized))
-m_new_contract('Callable', ist(collections.Callable))
-m_new_contract('Sequence', ist(collections.Sequence))
-m_new_contract('Set', ist(collections.Set))
-m_new_contract('MutableSequence', ist(collections.MutableSequence))
-m_new_contract('MutableSet', ist(collections.MutableSet))
-m_new_contract('Mapping', ist(collections.Mapping))
-m_new_contract('MutableMapping', ist(collections.MutableMapping))
-#new_contract('MappingView', ist(collections.MappingView))
-#new_contract('ItemsView', ist(collections.ItemsView))
-#new_contract('ValuesView', ist(collections.ValuesView))
+m_new_contract('Iterator', ist(collectionsAbc.Iterator))
+m_new_contract('Sized', ist(collectionsAbc.Sized))
+m_new_contract('Callable', ist(collectionsAbc.Callable))
+m_new_contract('Sequence', ist(collectionsAbc.Sequence))
+m_new_contract('Set', ist(collectionsAbc.Set))
+m_new_contract('MutableSequence', ist(collectionsAbc.MutableSequence))
+m_new_contract('MutableSet', ist(collectionsAbc.MutableSet))
+m_new_contract('Mapping', ist(collectionsAbc.Mapping))
+m_new_contract('MutableMapping', ist(collectionsAbc.MutableMapping))
+# new_contract('MappingView', ist(collections.MappingView))
+# new_contract('ItemsView', ist(collections.ItemsView))
+# new_contract('ValuesView', ist(collections.ValuesView))
 
 
 # Not a lambda to have better messages
-def is_None(x): 
+def is_None(x):
     return x is None
 
+
 m_new_contract('None', is_None)
 m_new_contract('NoneType', is_None)
--- a/src/contracts/library/seq.py
+++ b/src/contracts/library/seq.py
@@ -1,7 +1,12 @@
 from ..interface import Contract, ContractNotRespected
 from ..syntax import (add_contract, W, contract_expression, O, S, add_keyword,
     Keyword)
-import collections
+
+try:
+    import collections.abc as collectionsAbc  # python 3.6+
+except ImportError:
+    import collections as collectionsAbc
+
 from past.builtins import xrange
 
 try:
@@ -38,7 +43,7 @@ def check_contract(self, context, value, silent):
 
             return
 
-        if not isinstance(value, collections.Sequence):
+        if not isinstance(value, collectionsAbc.Sequence):
             error = 'Expected a Sequence, got %r.' % value.__class__.__name__
             raise ContractNotRespected(self, error, value, context)
 
--- a/src/contracts/library/sets.py
+++ b/src/contracts/library/sets.py
@@ -1,7 +1,10 @@
 from ..interface import Contract, ContractNotRespected, describe_type
 from ..syntax import (Keyword, O, S, W, add_contract, add_keyword,
     contract_expression)
-import collections
+try:
+    import collections.abc as collectionsAbc  # python 3.6+
+except ImportError:
+    import collections as collectionsAbc
 
 
 class ASet(Contract):
@@ -13,7 +16,7 @@ def __init__(self, length_contract=None,
         self.elements_contract = elements_contract
 
     def check_contract(self, context, value, silent):
-        if not isinstance(value, collections.Set):
+        if not isinstance(value, collectionsAbc.Set):
             error = 'Expected a set, got %r.' % describe_type(value)
             raise ContractNotRespected(self, error, value, context)