Simpler and faster prototype

elecay · elecay · commit ca20fdc87c84 · 2017-03-28T20:55:01.000+02:00
A basic performance test:

if __name__ == '__main__':
    import time

    for _ in range(10):
        n = 10000
        t0 = time.time()
        for i in range(n):
            main()
        t1 = time.time()

        total_n = t1 - t0
        print(total_n)

Results:

copy.deepcopy()

0.5343360900878906
0.3827991485595703
0.335590124130249
0.3641550540924072
0.3552978038787842
0.39732789993286133
0.4047999382019043
0.35767602920532227
0.40660595893859863
0.3223540782928467

__class__

0.056986093521118164
0.04783987998962402
0.04845404624938965
0.043087005615234375
0.04816293716430664
0.051603078842163086
0.046478986740112305
0.044046878814697266
0.048792123794555664
0.05028414726257324
diff --git a/creational/prototype.py b/creational/prototype.py
@@ -1,16 +1,15 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
-import copy
-
 
 class Prototype(object):
 
     value = 'default'
 
     def clone(self, **attrs):
         """Clone a prototype and update inner attributes dictionary"""
-        obj = copy.deepcopy(self)
+        # Python in Practice, Mark Summerfield
+        obj = self.__class__()
         obj.__dict__.update(attrs)
         return obj
 
