README.md

@@ -119,6 +119,7 @@ support some of its types. This is a list of verified composite types:
 
 * `Union` (Including `Optional`)
 * `List`
+* `Tuple`
 * `Any`
 * `dict_deserializer.deserializer.Deserializable`
 * `dict`
@@ -134,8 +135,6 @@ It supports these types as terminal types:
 
 ## Planned features
 
-* Tuples
-    * Lists will probably deserialize into tuples
 * NamedTuples
     * The anonymous namedtuple and the class-namedtuples with (optionally) type annotations.
 * Dataclasses

dict_deserializer/__init__.py

 from collections import namedtuple
 
 name = 'Dictionary deserializer'
-version = '0.0.4'
+version = '0.0.5'
 description = "Dictionary deserializer is a package that aides in the " \
               "deserializing of JSON (or other structures) that are " \
               "converted to dicts, into composite classes."

dict_deserializer/deserializer.py

@@ -26,7 +26,9 @@ class Rule:
         self.default = default
 
     def __repr__(self: 'Rule'):
+        if self.default:
             return "Rule(type={}, default={})".format(self.type, self.default)
+        return "Rule(type={})".format(self.type)
 
     def validate(self: 'Rule', key: str, value):
         """
@@ -46,8 +48,10 @@ class DeserializableMeta(type):
     """
     Metaclass for all Deserializable
     """
+
     def __new__(
-            mcs: 'DeserializableMeta', name: str, bases: Tuple[type], namespace: dict)\
+            mcs: 'DeserializableMeta', name: str, bases: Tuple[type],
+            namespace: dict) \
             -> type:
         def auto_ctor(self, **kwargs):
             for k, v in type(self).get_attrs().items():
@@ -71,7 +75,7 @@ class DeserializableMeta(type):
         return cls
 
 
-def _rbase(cls: type, ls: List[type]=None) -> List[type]:
+def _rbase(cls: type, ls: List[type] = None) -> List[type]:
     """
     Get all base classes for cls.
     """
@@ -95,7 +99,7 @@ def _is_valid(key: str, value) -> bool:
     """
     return not key.startswith('_') and \
            not callable(value) and \
-           not isinstance(value, classmethod) and\
+           not isinstance(value, classmethod) and \
            not isinstance(value, staticmethod) and \
            not isinstance(value, property)
 
@@ -104,6 +108,7 @@ class Deserializable(metaclass=DeserializableMeta):
     """
     Base class for all automagically deserializing classes.
     """
+
     @classmethod
     def get_attrs(cls) -> Dict[str, Rule]:
         """
@@ -167,7 +172,7 @@ def get_deserialization_classes(t, d, try_all=True) -> List[type]:
     return candidates
 
 
-def deserialize(rule: Rule, data, try_all: bool=True, key: str='$'):
+def deserialize(rule: Rule, data, try_all: bool = True, key: str = '$'):
     """
     Converts the passed in data into a type that is compatible with rule.
 
@@ -179,12 +184,13 @@ def deserialize(rule: Rule, data, try_all: bool=True, key: str='$'):
         path to the current value.
     :return: An instance matching Rule.
     """
-    # In case of primitive types, attempt to assign.
+    # Deserialize primitives
     try:
         return rule.validate(key, data)
     except TypeError:
         pass
 
+    # Deserialize type unions
     if type(rule.type) is type(Union):
         for arg in rule.type.__args__:
             try:
@@ -197,13 +203,15 @@ def deserialize(rule: Rule, data, try_all: bool=True, key: str='$'):
         raise TypeError('{} did not match any of {} for key {}.'
                         .format(type(data), rule.type.__args__, key))
 
+    # Deserialize lists
     if type(rule.type) is type(List):
         if len(rule.type.__args__) != 1:
             raise TypeError(
-                'Cannot handle list with 0 or more than 1 type arguments.')
+                'Cannot handle list with 0 or more than 1 type arguments at {}.'
+                    .format(key))
         if type(data) != list:
             raise TypeError(
-                'Cannot deserialize non-list into list.')
+                'Cannot deserialize non-list into list at {}.'.format(key))
         t = rule.type.__args__[0]
         result = []
         for i, v in enumerate(data):
@@ -215,6 +223,17 @@ def deserialize(rule: Rule, data, try_all: bool=True, key: str='$'):
             ))
         return result
 
+    # Deserialize tuples
+    if type(rule.type) is type(Tuple):
+        if len(rule.type.__args__) != len(data):
+            raise TypeError(
+                'Expected a list of {} elements, but got {} elements at {}.'
+                    .format(len(rule.type.__args__), len(data), key))
+
+        return tuple(deserialize(Rule(v[0]), v[1], key="{}.{}".format(key, k))
+                     for k, v in enumerate(zip(rule.type.__args__, data)))
+
+    # Deserialize classes
     if issubclass(rule.type, Deserializable):
         if not isinstance(data, dict):
             raise TypeError('Cannot deserialize non-dict into class.')
@@ -225,6 +244,12 @@ def deserialize(rule: Rule, data, try_all: bool=True, key: str='$'):
 
         for cls in classes:
             try:
+                # Instantiate cls with parameters generated by
+                # the list comprehension.
+                # It loops through all defined attributes, and
+                # defines it by recursively calling deserialize on
+                # each of those attributes with the values found in
+                # either data, or by using a default.
                 return cls(**{k: deserialize(
                     r,
                     data[k] if k in data else r.default,
@@ -238,7 +263,8 @@ def deserialize(rule: Rule, data, try_all: bool=True, key: str='$'):
                     cause = e
 
         raise TypeError('Unable to find matching non-abstract (sub)type of '
-                        '{} with key {}. Reason: {}.'.format(rule.type, key, cause))
+                        '{} with key {}. Reason: {}.'.format(rule.type, key,
+                                                             cause))
 
     raise TypeError('Unable to find a deserialization candidate for '
                     '{} with key {}.'.format(rule, key))

setup.py

@@ -18,7 +18,7 @@ setuptools.setup(
     description=dict_deserializer.description,
     long_description=long_description,
     long_description_content_type="text/markdown",
-    url="https://git.iapc.utwente.nl/rkleef/serializer_utils",
+    url="https://github.com/rhbvkleef/dict_deserializer",
     packages=setuptools.find_packages(),
     install_requires=requirements,
     classifiers=[

test_DirectoryExample.py

 import unittest
-from typing import List, Optional
+from typing import List, Optional, Tuple
 
 from dict_deserializer.annotations import abstract
 from dict_deserializer.deserializer import Deserializable, deserialize, Rule
@@ -47,8 +47,19 @@ class Group(Object):
                and other.members == self.members
 
 
+class NestedTypingStuff(Deserializable):
+    test: List[Tuple[int, int, int]]
+
+    def __str__(self):
+        return "NestedTypingStuff(test={})".format(self.test)
+
+    def __eq__(self, other):
+        return isinstance(other, NestedTypingStuff) and self.test == other.test
+
+
 class TestLists(unittest.TestCase):
     def test_CorrectDeserializationForNestedWithTypeUnionsAndLists(self):
+        # noinspection PyArgumentList
         self.assertEqual(
             Group(
                 name='IAPC',
@@ -89,3 +100,35 @@ class TestLists(unittest.TestCase):
             deserialize(Rule(Object), {
                 'name': 'Test'
             })
+
+    def test_DeserializeTupleCorrect(self):
+        # noinspection PyArgumentList
+        self.assertEqual(
+            NestedTypingStuff(test=[(1, 2, 3)]),
+            deserialize(Rule(NestedTypingStuff), {
+                "test": [
+                    [
+                        1, 2, 3
+                    ]
+                ]
+            })
+        )
+
+    def test_DeserializeTupleFail(self):
+        with self.assertRaises(TypeError) as ctx:
+            deserialize(Rule(NestedTypingStuff), {
+                "test": [
+                    [
+                        1, 2
+                    ]
+                ]
+            })
+
+        with self.assertRaises(TypeError) as ctx:
+            deserialize(Rule(NestedTypingStuff), {
+                "test": [
+                    [
+                        1, 2, "boo"
+                    ]
+                ]
+            })