add comparisons file missed in last commit

moto/dynamodb/comparisons.py

@@ -0,0 +1,76 @@
+COMPARISON_FUNCS = {
+    'EQ': lambda item_value, test_value: item_value == test_value,
+    'GT': lambda item_value, test_value: item_value > test_value
+}
+
+
+def get_comparison_func(range_comparison):
+    return COMPARISON_FUNCS.get(range_comparison)
+
+# class EQ(ConditionOneArg):
+
+#     pass
+
+
+# class NE(ConditionOneArg):
+
+#     pass
+
+
+# class LE(ConditionOneArg):
+
+#     pass
+
+
+# class LT(ConditionOneArg):
+
+#     pass
+
+
+# class GE(ConditionOneArg):
+
+#     pass
+
+
+# class GT(ConditionOneArg):
+
+#     pass
+
+
+# class NULL(ConditionNoArgs):
+
+#     pass
+
+
+# class NOT_NULL(ConditionNoArgs):
+
+#     pass
+
+
+# class CONTAINS(ConditionOneArg):
+
+#     pass
+
+
+# class NOT_CONTAINS(ConditionOneArg):
+
+#     pass
+
+
+# class BEGINS_WITH(ConditionOneArg):
+
+#     pass
+
+
+# class IN(ConditionOneArg):
+
+#     pass
+
+
+# class BEGINS_WITH(ConditionOneArg):
+
+#     pass
+
+# class BETWEEN(ConditionTwoArgs):
+
+#     pass