add __deepcopy__ on all serializers (#1)

Author: nxexox

README.md

@@ -18,44 +18,51 @@ Full documentation for the project is available at [https://nxexox.github.io/pyt
 
 Install using `pip`, including any optional packages you want...
 
-    pip install python-rest-framework
+```bash
+pip install python-rest-framework
+```
 
 ...or clone the project from github.
 
-    git clone [email protected]:nxexox/python-rest-framework.git
-
+```bash
+git clone [email protected]:nxexox/python-rest-framework.git
+```
 
 ## Example
 
 For example, we will serialize the data from the request object.
 
 First we write the serializer
 
-    from rest_framework.serializers import (
-        Serializer, CharField, IntegerField, ListField, FloatField
-    )
+```python
+from rest_framework.serializers import (
+    Serializer, CharField, IntegerField, ListField, FloatField
+)
 
-    # Example serializer for parsing body data from web request.
-    class ExampleSerializer(Serializer):
-        char_field = CharField(label='This char field', required=True)
-        int_field = IntegerField(label='This int field', required=True)
-        list_float_field = ListField(child=FloatField(), required=True, min_length=2)
+# Example serializer for parsing body data from web request.
+class ExampleSerializer(Serializer):
+    char_field = CharField(label='This char field', required=True)
+    int_field = IntegerField(label='This int field', required=True)
+    list_float_field = ListField(child=FloatField(), required=True, min_length=2)
+```
 
 ---
 
 Now we process the request body with a serializer
 
-    # web request data
-    data = {
-        'char_field': 'example', 'int_field': 1,
-        'list_float_field': [1.0, 1.1, 1.2]
-    }
-
-    ser = ExampleSerializer(data=data)
-    if ser.is_valid():
-        print(ser.validated_data)
-    else:
-        print(ser.errors)
+```python
+# web request data
+data = {
+    'char_field': 'example', 'int_field': 1,
+    'list_float_field': [1.0, 1.1, 1.2]
+}
+
+ser = ExampleSerializer(data=data)
+if ser.is_valid():
+    print(ser.validated_data)
+else:
+    print(ser.errors)
+```
 
 [docs]: https://nxexox.github.io/python-rest-framework/
 [pypi-version]: https://img.shields.io/pypi/v/python-rest-framework.svg

rest_framework/serializers/serializers.py

@@ -125,6 +125,9 @@ def __new__(cls, *args, **kwargs):
             return cls.many_init(*args, **kwargs)
         return super(BaseSerializer, cls).__new__(cls)
 
+    def __deepcopy__(self, memo={}):
+        return self.__class__(instance=self.instance, data=self.data)
+
     @classmethod
     def many_init(cls, *args, **kwargs):
         """
@@ -501,6 +504,12 @@ def __init__(self, child=None, allow_empty=None, *args, **kwargs):
         # Bind child serializer.
         self.child.bind(field_name='', parent=self)
 
+    def __deepcopy__(self, memo={}):
+        return self.__class__(
+            instance=self.instance, data=self.data,
+            child=self.child, allow_empty=self.allow_empty
+        )
+
     def to_internal_value(self, data):
         """
         Data transformation to python list object.