dict 2

dicttest.py

In [132]: def test1():
     ...:     with open('domain.txt') as f:
     ...:         data = {}
     ...:         for x in f:
     ...:             length = len(x.strip().split('.'))
     ...:             data[length] = 1 if not length in data else data[length] + 1
     ...:     return data
     ...:

In [133]: def test():
     ...:     with open('domain.txt') as f:
     ...:         data = {}
     ...:         for x in f:
     ...:             length = len(x.strip().split('.'))
     ...:             data[length] = data.get(length, 0) + 1
     ...:     return data
     ...:
          
In [169]: def test2():
     ...:     with open('domain.txt') as f:
     ...:         data = {}
     ...:         for x in f:
     ...:             length = len(x.strip().split('.'))
     ...:             if length in data:
     ...:                 data[length] = data[length] + 1
     ...:             else: data[length] = 1
     ...:     return data
     ...:
          
          
In [114]: def test3():
     ...:     with open('domain.txt') as f:
     ...:         data = {}
     ...:         for x in f:
     ...:             if '#' in x: continue
     ...:             length = len(x.strip().split('.'))
     ...:             data.setdefault(length, []).append(x.strip())
     ...:     return data
     ...:
          
          
In [135]: test()
Out[135]:
{2: 105390,
 3: 33938,
 4: 4982,
 5: 892,
 6: 405,
 7: 80,
 8: 54,
 9: 27,
 10: 17,
 11: 24,
 12: 6,
 13: 9,
 14: 5,
 15: 4,
 16: 4,
 17: 4,
 18: 1,
 19: 1}
 
In [136]: test1()
Out[136]:
{2: 105390,
 3: 33938,
 4: 4982,
 5: 892,
 6: 405,
 7: 80,
 8: 54,
 9: 27,
 10: 17,
 11: 24,
 12: 6,
 13: 9,
 14: 5,
 15: 4,
 16: 4,
 17: 4,
 18: 1,
 19: 1}

In [169]: test2()
Out[169]:
{2: 105390,
 3: 33938,
 4: 4982,
 5: 892,
 6: 405,
 7: 80,
 8: 54,
 9: 27,
 10: 17,
 11: 24,
 12: 6,
 13: 9,
 14: 5,
 15: 4,
 16: 4,
 17: 4,
 18: 1,
 19: 1}
 
In [139]: %timeit test()
10 loops, best of 3: 174 ms per loop

In [140]: %timeit test1()
10 loops, best of 3: 179 ms per loop

In [141]: %timeit test()
10 loops, best of 3: 172 ms per loop

In [142]: %timeit test1()
10 loops, best of 3: 170 ms per loop

In [143]: %timeit test()
10 loops, best of 3: 172 ms per loop

In [144]: %timeit test1()
10 loops, best of 3: 167 ms per loop

In [146]: %timeit test()
10 loops, best of 3: 171 ms per loop

In [147]: %timeit test1()
10 loops, best of 3: 163 ms per loop

In [148]: %timeit test()
10 loops, best of 3: 173 ms per loop

In [149]: %timeit test1()
10 loops, best of 3: 163 ms per loop
     

In [170]: %timeit test2()
10 loops, best of 3: 163 ms per loop

In [171]: %timeit test2()
10 loops, best of 3: 162 ms per loop

In [172]: %timeit test2()
10 loops, best of 3: 162 ms per loop

In [173]: %timeit test2()
10 loops, best of 3: 167 ms per loop

In [174]: %timeit test2()
10 loops, best of 3: 161 ms per loop

In [175]: %timeit test2()
10 loops, best of 3: 165 ms per loop