nosetestデコレータで複数回unittestを実行中

Question

デコレータでunittestを実行すると、同じ関数が2回呼び出されます。

2回目の実行を防止するにはどうすればよいですか？

import unittest 
from ast import literal_eval 
from functools import wraps 


def log_decorator(f): 
    @wraps(f) 
    def wrapper(self, *args, **kw): 
     print 'process start' 
     f(self, *args, **kw) 
     print 'process end' 
     return f(self, *args, **kw) 
    return wrapper 


class Correct(object): 
    def __init__(self, points=None): 
     self.points = points 

    @log_decorator 
    def apply(self): 
     try: 
      result = {} 
      for position, points in self.points.items(): 
       i, j = literal_eval(position) 
       intr = [] 
       for point in points: 
        point['x1'] = point['x1'] * 1 + j 
        point['x2'] = point['x2'] * 1 + j 
        intr.append(point) 
        result[position] = intr 
     except Exception as e: 
      print 'Exception ==', e 
     return result 

val = {'(0, 100)': [{ 
       'x1': 100.0, 
       'x2': 200.0, 
       }]} 


class TestPoints(unittest.TestCase): 

    def setUp(self): 
     self.coordinates1 = val 

    def test_points(self): 
     import pprint 
     print 'points before == ', pprint.pprint(val) 
     points = Correct(val).apply() 
     print 'points after == ', pprint.pprint(val) 


if __name__ == '__main__': 
    unittest.main() 

結果： -

points before == {'(0, 100)': [{'x1': 100.0, 'x2': 200.0}]} 
None 
process start 
process end 
points after == {'(0, 100)': [{'x1': 300.0, 'x2': 400.0}]} 
None 
. 
---------------------------------------------------------------------- 
Ran 1 test in 0.001s 

OK 

Answer 1

def log_decorator(f): 
    @wraps(f) 
    def wrapper(self, *args, **kw): 
     print 'process start' 
     f(self, *args, **kw) 
     print 'process end' 
     return f(self, *args, **kw) 
    return wrapper 

このデコレータ機能が間違っています。 fを2回実行します。 1つは2つのprintの間であり、もう1つはreturnの後です。

print 'process start' 
f(self, *args, **kw) # One 
print 'process end' 
return f(self, *args, **kw) # Two 

更新

正しい方法：機能

print 'process start' 
result = f(self, *args, **kw) # Only once 
print 'process end' 
return result