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  1. import timeit
  2.  
  3. setup = """
  4. class X:
  5.   def __init__(self):
  6.     self.n = 2
  7.   def f0(self):
  8.     return 0
  9.   def f1(self):
  10.     return 1
  11.   def f2(self):
  12.     return 2
  13.   def f3(self):
  14.     return 3
  15. x = X()
  16. d = {0: x.f0, 1: x.f1, 2: x.f2, 3: x.f3}
  17. """
  18. # If-statement 1
  19. code1 = """
  20. if x.n == 0:
  21.   x.n = x.f0()
  22. elif x.n == 1:
  23.   x.n = x.f1()
  24. elif x.n == 2:
  25.   x.n = x.f2()
  26. elif x.n == 3:
  27.   x.n = x.f3()
  28. """
  29. # If-statement 2
  30. code2 = """
  31. n = x.n
  32. if n == 0:
  33.   x.n = x.f0()
  34. elif n == 1:
  35.   x.n = x.f1()
  36. elif n == 2:
  37.   x.n = x.f2()
  38. elif n == 3:
  39.   x.n = x.f3()
  40. """
  41. # Dictionary 1
  42. code3 = """
  43. try:
  44.   x.n = d[x.n]()
  45. except KeyError:
  46.   pass
  47. """
  48. # Dictionary 2
  49. code4 = """
  50. x.n = d.get(x.n, lambda: x.n)()
  51. """
  52.  
  53. print timeit.Timer(code1, setup).timeit(), "If-statement 1"
  54. print timeit.Timer(code2, setup).timeit(), "If-statement 2"
  55. print timeit.Timer(code3, setup).timeit(), "Dictionary 1"
  56. print timeit.Timer(code4, setup).timeit(), "Dictionary 2"
  57.  
Success #stdin #stdout 3.57s 6740KB
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1.01429390907 If-statement 1
0.895260095596 If-statement 2
0.578783988953 Dictionary 1
1.08309197426 Dictionary 2
https://ideone.com/ORQxP
language:
Python (cpython 2.7.16)
created:
13 years ago
visibility:
secret

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