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  1. def replace():
  2.   '''Using try-except'''
  3.   myl = [1, 2, 3, 4, 5, 4, 4, 4, 4, 6, 6, 9, 4, 2, 2, 22, 99, 0, 100, 100, 34, 55]
  4.   # myl.extend ([100] * 100)
  5.   while True: 
  6.     try: 
  7.       myl[ myl.index (4) ] = 44 
  8.     except: 
  9.       break
  10.  
  11. def replace2():
  12.   '''Using slice-assign''' 
  13.   myl = [1, 2, 3, 4, 5, 4, 4, 4, 4, 6, 6, 9, 4, 2, 2, 22, 99, 0, 100, 100, 34, 55]
  14.   # myl.extend ([100] * 100)
  15.  
  16.   myl[:] = [x if x != 4 else 44 for x in myl]
  17.  
  18. def replace3():
  19.   '''Using enumerate'''
  20.   myl = [1, 2, 3, 4, 5, 4, 4, 4, 4, 6, 6, 9, 4, 2, 2, 22, 99, 0, 100, 100, 34, 55]
  21.   # myl.extend ([100] * 100)
  22.  
  23.   for idx, item in enumerate(myl): 
  24.     if item == 4:
  25.         myl[idx] = 44
  26.  
  27. import timeit
  28. #print(timeit.timeit("test()", setup="from __main__ import test"))
  29. print(timeit.timeit("replace()", setup="from __main__ import replace")), replace.func_doc
  30. print(timeit.timeit("replace2()", setup="from __main__ import replace2")), replace2.func_doc
  31. print(timeit.timeit("replace3()", setup="from __main__ import replace3")), replace3.func_doc
  32.  
Success #stdin #stdout 13.33s 7908KB
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6.65385389328 None
3.40503907204 None
3.29963207245 None
https://ideone.com/fC6oA5
timing test for replace version in python
language:
Python (cpython 2.7.16)
created:
11 years ago
visibility:
secret

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