named tuple performance

output

$ py3.3 time_them.py
default implementation:
2.1573487099958584
my implementation:
0.7448599760100478
$ py3.3 time_them_2.py
default implementation:
0.6372028530022362
my implementation:
0.20809232600731775

time_them.py

import timeit

print('default implementation:')
print(min(timeit.repeat('''
Record = namedtuple('Record', 'name, value')

class Point(namedtuple('Point', 'x, y')):
    'A fancy, fancy, 2d point'
    @property
    def hypot(self):
        'p.hypot -> √(p.x² + p.y²)'
        return (self.x ** 2 + self.y ** 2) ** 0.5

    def __str__(self):
        return 'Point: x=%6.3f  y=%6.3f  hypot=%6.3f' % (self.x,
                                                         self.y,
                                                         self.hypot)


class EmployeeRecord(namedtuple('EmployeeRecord', 'name, age, title,'
                                                  'department, paygrade')):
    def __init__(self, name, age, title, department, paygrade):
        assert isinstance(paygrade, int) and paygrade >= 0, \
            'paygrade should be an integer >= 0, but is: {!r}'.format(paygrade)
''',
'from collections import namedtuple', number=1000, repeat=5)))

print('my implementation:')
print(min(timeit.repeat('''
@namedtuple
def Record(name, value):
    pass

@namedtuple
def Point(x, y):
    'A fancy, fancy, 2d point'


@Point._property
def hypot(self):
    'p.hypot -> √(p.x² + p.y²)'
    return (self.x ** 2 + self.y ** 2) ** 0.5


@Point._method
def __str__(self):
    return 'Point: x=%6.3f  y=%6.3f  hypot=%6.3f' % (self.x,
                                                     self.y,
                                                     self.hypot)


@namedtuple
def EmployeeRecord(name, age, title, department, paygrade=1):
    assert isinstance(paygrade, int) and paygrade >= 0, \
        'paygrade should be an integer >= 0, but is: {!r}'.format(paygrade)
''',
'from named import namedtuple', number=1000, repeat=5)))

time_them_2.py

import timeit

print('default implementation:')
print(min(timeit.repeat('''
Record = namedtuple('Record', 'name, value')
''',
'from collections import namedtuple', number=1000, repeat=10)))

print('my implementation:')
print(min(timeit.repeat('''
@namedtuple
def Record(name, value):
    pass
''',
'from named import namedtuple', number=1000, repeat=10)))