An implementation of namedtuple written in c for warp speed.
Tested against Python 3.4 and 3.5, and 3.6.
These operations scale with the number of fields.
$ ./prof/bench
Running with: Python 3.6.1 (default, Mar 27 2017, 00:27:06) [GCC 6.3.1 20170306]
type creation from string with 1 field(s): namedtuple('NT', 'a')
collections: 253 us +- 10 us
cnamedtuple: 6.47 us +- 0.38 us
ratio: 39.03
type creation from string with 2 field(s): namedtuple('NT', 'a b')
collections: 271 us +- 8 us
cnamedtuple: 6.59 us +- 0.17 us
ratio: 41.18
type creation from string with 3 field(s): namedtuple('NT', 'a b c')
collections: 290 us +- 6 us
cnamedtuple: 6.77 us +- 0.17 us
ratio: 42.80
type creation from string with 4 field(s): namedtuple('NT', 'a b c d')
collections: 308 us +- 12 us
cnamedtuple: 7.07 us +- 0.21 us
ratio: 43.62
type creation from string with 5 field(s): namedtuple('NT', 'a b c d e')
collections: 322 us +- 5 us
cnamedtuple: 7.38 us +- 0.18 us
ratio: 43.66
type creation from string with 6 field(s): namedtuple('NT', 'a b c d e f')
collections: 337 us +- 4 us
cnamedtuple: 7.67 us +- 0.26 us
ratio: 43.92
type creation from string with 7 field(s): namedtuple('NT', 'a b c d e f g')
collections: 353 us +- 5 us
cnamedtuple: 8.11 us +- 0.18 us
ratio: 43.46
type creation from string with 8 field(s): namedtuple('NT', 'a b c d e f g h')
collections: 369 us +- 7 us
cnamedtuple: 8.34 us +- 0.20 us
ratio: 44.18
type creation from sequence with 1 field(s): namedtuple('NT', ['a'])
collections: 252 us +- 4 us
cnamedtuple: 6.21 us +- 0.10 us
ratio: 40.56
type creation from sequence with 2 field(s): namedtuple('NT', ['a', 'b'])
collections: 351 us +- 44 us
cnamedtuple: 6.57 us +- 0.18 us
ratio: 53.42
type creation from sequence with 3 field(s): namedtuple('NT', ['a', 'b', 'c'])
collections: 289 us +- 6 us
cnamedtuple: 6.77 us +- 0.23 us
ratio: 42.66
type creation from sequence with 4 field(s): namedtuple('NT', ['a', 'b', 'c', 'd'])
collections: 310 us +- 12 us
cnamedtuple: 6.92 us +- 0.21 us
ratio: 44.84
type creation from sequence with 5 field(s): namedtuple('NT', ['a', 'b', 'c', 'd', 'e'])
collections: 322 us +- 3 us
cnamedtuple: 7.31 us +- 0.16 us
ratio: 44.02
type creation from sequence with 6 field(s): namedtuple('NT', ['a', 'b', 'c', 'd', 'e', 'f'])
collections: 336 us +- 5 us
cnamedtuple: 7.52 us +- 0.18 us
ratio: 44.72
type creation from sequence with 7 field(s): namedtuple('NT', ['a', 'b', 'c', 'd', 'e', 'f', 'g'])
collections: 352 us +- 6 us
cnamedtuple: 8.03 us +- 0.19 us
ratio: 43.83
type creation from sequence with 8 field(s): namedtuple('NT', ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h'])
collections: 366 us +- 4 us
cnamedtuple: 8.25 us +- 0.18 us
ratio: 44.38
type instance creation with positional arguments and 1 field(s): NT(0)
collections: 333 ns +- 8 ns
cnamedtuple: 221 ns +- 5 ns
ratio: 1.51
type instance creation with positional arguments and 2 field(s): NT(0, 1)
collections: 344 ns +- 10 ns
cnamedtuple: 228 ns +- 5 ns
ratio: 1.51
type instance creation with positional arguments and 3 field(s): NT(0, 1, 2)
collections: 355 ns +- 8 ns
cnamedtuple: 234 ns +- 7 ns
ratio: 1.51
type instance creation with positional arguments and 4 field(s): NT(0, 1, 2, 3)
collections: 362 ns +- 6 ns
cnamedtuple: 242 ns +- 5 ns
ratio: 1.49
type instance creation with positional arguments and 5 field(s): NT(0, 1, 2, 3, 4)
collections: 378 ns +- 14 ns
cnamedtuple: 249 ns +- 8 ns
ratio: 1.52
type instance creation with positional arguments and 6 field(s): NT(0, 1, 2, 3, 4, 5)
collections: 382 ns +- 9 ns
cnamedtuple: 254 ns +- 6 ns
ratio: 1.51
type instance creation with positional arguments and 7 field(s): NT(0, 1, 2, 3, 4, 5, 6)
collections: 397 ns +- 10 ns
cnamedtuple: 262 ns +- 11 ns
ratio: 1.52
type instance creation with positional arguments and 8 field(s): NT(0, 1, 2, 3, 4, 5, 6, 7)
collections: 422 ns +- 11 ns
cnamedtuple: 269 ns +- 5 ns
ratio: 1.57
type instance creation with keyword arguments and 1 field(s): NT(a=0)
collections: 421 ns +- 7 ns
cnamedtuple: 269 ns +- 5 ns
ratio: 1.56
type instance creation with keyword arguments and 2 field(s): NT(a=0, b=1)
collections: 455 ns +- 7 ns
cnamedtuple: 300 ns +- 6 ns
ratio: 1.52
type instance creation with keyword arguments and 3 field(s): NT(a=0, b=1, c=2)
collections: 491 ns +- 15 ns
cnamedtuple: 330 ns +- 12 ns
ratio: 1.49
type instance creation with keyword arguments and 4 field(s): NT(a=0, b=1, c=2, d=3)
collections: 526 ns +- 11 ns
cnamedtuple: 357 ns +- 6 ns
ratio: 1.47
type instance creation with keyword arguments and 5 field(s): NT(a=0, b=1, c=2, d=3, e=4)
collections: 572 ns +- 9 ns
cnamedtuple: 388 ns +- 11 ns
ratio: 1.47
type instance creation with keyword arguments and 6 field(s): NT(a=0, b=1, c=2, d=3, e=4, f=5)
collections: 666 ns +- 20 ns
cnamedtuple: 469 ns +- 15 ns
ratio: 1.42
type instance creation with keyword arguments and 7 field(s): NT(a=0, b=1, c=2, d=3, e=4, f=5, g=6)
collections: 698 ns +- 17 ns
cnamedtuple: 493 ns +- 11 ns
ratio: 1.42
type instance creation with keyword arguments and 8 field(s): NT(a=0, b=1, c=2, d=3, e=4, f=5, g=6, h=7)
collections: 741 ns +- 15 ns
cnamedtuple: 526 ns +- 17 ns
ratio: 1.41
field access: instance.b
collections: 45.2 ns +- 1.2 ns
cnamedtuple: 24.8 ns +- 0.8 ns
ratio: 1.82
median ratio: 1.82The project is hosted on github.
Before submitting a patch, please make sure your Python code is PEP8 compliant and your c code is PEP7 compliant.
Please file all bug reports on github.
For questions or comments, feel free to email me at joe@quantopian.com