initial creation

py3interm/EXAMPLES/json_custom_singledispatch.py

@@ -0,0 +1,58 @@
+#!/usr/bin/env python
+#
+import json
+from datetime import date, datetime
+from functools import singledispatch
+
+
+# uncomment if Python version < 3.4 and comment out above line
+# from singledispatch import singledispatch
+
+
+class Parrot():
+    def __init__(self, name, color):
+        self._name = name
+        self._color = color
+
+    @property
+    def name(self):
+        return self._name
+
+    @property
+    def color(self):
+        return self._color
+
+
+parrots = [
+    Parrot('Polly', 'green'),
+    Parrot('Peggy', 'blue'),
+    Parrot('Roger', 'red'),
+]
+
+data = {
+    'spam': [1, 2, 3],
+    'ham': ('a', 'b', 'c'),
+    'date': date(2014, 8, 1),
+    'timestamp': datetime(2014, 8, 1, 15, 34, 19),
+    'parrots': parrots,
+}
+
+
+@singledispatch
+def encode(obj):
+    return obj
+
+
+@encode.register(date)
+def encode_date(date_obj):
+    return date_obj.isoformat()
+
+
+@encode.register(Parrot)
+def encode_parrot(parrot_obj):
+    return {'name': parrot_obj.name, 'color': parrot_obj.color}
+
+
+# register other encoding functions here
+
+print(json.dumps(data, default=encode, indent=4))