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  1. import timeit
  2. import __main__
  3. from cStringIO import StringIO
  4. from itertools import chain, repeat, takewhile
  5. from copy import copy
  6.  
  7.  
  8. N = 1000 #Number of executions
  9. L = 1000 #Length of initial list
  10. stringio = "StringIO('1'*L+'Z111')"
  11.  
  12.  
  13. def test_f_iter_plus_Z():
  14.     stringio_loc = eval(stringio)
  15.     i = takewhile(lambda x: x!='',iter(lambda: stringio_loc.read(1),'Z'))
  16.     buf = ''.join(i) + 'Z'
  17.  
  18.  
  19. def test_f_iter_chain():
  20.     stringio_loc = eval(stringio)
  21.     i = takewhile(lambda x: x!='',iter(lambda: stringio_loc.read(1),'Z'))
  22.     i = chain(i,repeat('Z',1))
  23.     buf = ''.join(i)
  24.  
  25.  
  26. def take_until_included(stringio_loc):
  27.     for s in iter(lambda: stringio_loc.read(1),''):
  28.         yield s
  29.         if s=='Z':
  30.             return
  31.  
  32.  
  33. def test_f_generator():
  34.     stringio_loc = eval(stringio)
  35.     i = take_until_included(stringio_loc)
  36.     buf = ''.join(i)
  37.  
  38.  
  39. def test_f_chunks():
  40.     stringio_loc = eval(stringio)
  41.     datalist = []
  42.     for chunk in iter(lambda: stringio_loc.read(256),''):
  43.         if 'Z' not in chunk:
  44.             datalist.append(chunk)
  45.         else:
  46.             datalist.append(chunk[:chunk.find('Z')+1])
  47.             break
  48.     return ''.join(datalist)
  49.  
  50.  
  51. def test_f_chunks_generator():
  52.     stringio_loc = eval(stringio)
  53.     def gen(): 
  54.         for chunk in iter(lambda: stringio_loc.read(256),''):
  55.             if 'Z' not in chunk:
  56.                 yield chunk
  57.             else:
  58.                 yield chunk[:chunk.find('Z')+1]
  59.                 break
  60.     return ''.join(gen())  
  61.  
  62.  
  63. names = dir(__main__)
  64. for name in names:
  65.     attr = getattr(__main__,name)
  66.     if hasattr(attr,'__call__'):
  67.         if name.startswith('test_f_'):
  68.             init_name = name + '_init'
  69.             if hasattr(__main__, init_name):
  70.                 init = getattr(__main__,init_name)
  71.             else:
  72.                 init = 'from __main__ import {name}; from cStringIO import StringIO;'.format(name=name)
  73.             t = timeit.Timer(stmt='{name}()'.format(name=name),
  74.                              setup=init)
  75.  
  76.             time = t.timeit(N)
  77.             print('{name}: {time}'.format(name=name,time=time))
Success #stdin #stdout 3.48s 6748KB
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stdin
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Standard input is empty
stdout
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test_f_chunks: 0.0398950576782
test_f_chunks_generator: 0.0435070991516
test_f_generator: 1.00860309601
test_f_iter_chain: 1.20431208611
test_f_iter_plus_Z: 1.17145586014
https://ideone.com/dQGe5
language:
Python (cpython 2.7.16)
created:
12 years ago
visibility:
secret

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