Luego de de una larga compilación de información hemos podido solucionar esta aprieto que suelen tener algunos usuarios. Te regalamos la solución y deseamos que te sea de gran ayuda.
Solución:
>>> def isplit(iterable,splitters):
return [list(g) for k,g in itertools.groupby(iterable,lambda x:x in splitters) if not k]
>>> isplit(L,(None,))
[[1, 4], [6, 9], [3, 9, 4]]
>>> isplit(L,(None,9))
[[1, 4], [6], [3], [4]]
código de referencia:
import timeit
kabie=("isplit_kabie",
"""
import itertools
def isplit_kabie(iterable,splitters):
return [list(g) for k,g in itertools.groupby(iterable,lambda x:x in splitters) if not k]
""" )
ssplit=("ssplit",
"""
def ssplit(seq,splitters):
seq=list(seq)
if splitters and seq:
result=[]
begin=0
for end in range(len(seq)):
if seq[end] in splitters:
if end > begin:
result.append(seq[begin:end])
begin=end+1
if begin begin:
result.append(seq[begin:end])
begin=end+1
if begin50 else ret)
""".format(func=func,params=params)))
results = [tester.timeit(times) for i in range(rounds)]
if not debug:
print(":>16s takes::6.4f,avg::.2e,best::.4f,worst::.4f".format(
func,sum(results),sum(results)/times/rounds,min(results),max(results)))
def testAll(cases,data,params='',times=10000,rounds=3,debug=''):
if debug:
times,rounds = 1,1
for dat in data:
sdat = tuple(map(repr,dat))
print("x times:".format(times,rounds),
','.join("".format(d[:8]+"..."+d[-5:] if len(d)>16 else d)for d in map(repr,dat)))
for func,code in cases:
benchmark(func,code,dat,params,times,rounds,debug)
if __name__=='__main__':
testAll(cases,data,params,500,10)#,debug=True)
Salida en i3-530, Windows7, Python 3.1.2:
500x10 times: [1, 4, N...9, 4],(None,)
isplit_kabie takes:0.0605,avg:1.21e-05,best:0.0032,worst:0.0074
magicsplit takes:0.0287,avg:5.74e-06,best:0.0016,worst:0.0036
magicsplit2 takes:0.0174,avg:3.49e-06,best:0.0017,worst:0.0018
ssplit takes:0.0149,avg:2.99e-06,best:0.0015,worst:0.0016
ssplit2 takes:0.0198,avg:3.96e-06,best:0.0019,worst:0.0021
split_on takes:0.0229,avg:4.59e-06,best:0.0023,worst:0.0024
500x10 times: [1, 4, N...9, 4],9, None, 7
isplit_kabie takes:0.1448,avg:2.90e-05,best:0.0144,worst:0.0146
magicsplit takes:0.0636,avg:1.27e-05,best:0.0063,worst:0.0065
magicsplit2 takes:0.0891,avg:1.78e-05,best:0.0064,worst:0.0162
ssplit takes:0.0593,avg:1.19e-05,best:0.0058,worst:0.0061
ssplit2 takes:0.1004,avg:2.01e-05,best:0.0069,worst:0.0142
split_on takes:0.0929,avg:1.86e-05,best:0.0090,worst:0.0096
500x10 times: (),()
isplit_kabie takes:0.0041,avg:8.14e-07,best:0.0004,worst:0.0004
magicsplit takes:0.0040,avg:8.04e-07,best:0.0004,worst:0.0004
magicsplit2 takes:0.0022,avg:4.35e-07,best:0.0002,worst:0.0002
ssplit takes:0.0023,avg:4.59e-07,best:0.0002,worst:0.0003
ssplit2 takes:0.0023,avg:4.53e-07,best:0.0002,worst:0.0002
split_on takes:0.0072,avg:1.45e-06,best:0.0007,worst:0.0009
500x10 times: range(0, 1000),()
isplit_kabie takes:0.8892,avg:1.78e-04,best:0.0881,worst:0.0895
magicsplit takes:0.6614,avg:1.32e-04,best:0.0654,worst:0.0673
magicsplit2 takes:0.0958,avg:1.92e-05,best:0.0094,worst:0.0099
ssplit takes:0.0943,avg:1.89e-05,best:0.0093,worst:0.0095
ssplit2 takes:0.0943,avg:1.89e-05,best:0.0093,worst:0.0096
split_on takes:1.3348,avg:2.67e-04,best:0.1328,worst:0.1340
500x10 times: 'Split me',('', '')
isplit_kabie takes:0.0234,avg:4.68e-06,best:0.0023,worst:0.0024
magicsplit takes:0.0126,avg:2.52e-06,best:0.0012,worst:0.0013
magicsplit2 takes:0.0138,avg:2.76e-06,best:0.0013,worst:0.0015
ssplit takes:0.0119,avg:2.39e-06,best:0.0012,worst:0.0012
ssplit2 takes:0.0075,avg:1.50e-06,best:0.0007,worst:0.0008
split_on takes:0.0191,avg:3.83e-06,best:0.0018,worst:0.0023
500x10 times: 'split m... me ',' '
isplit_kabie takes:2.0803,avg:4.16e-04,best:0.2060,worst:0.2098
magicsplit takes:0.9219,avg:1.84e-04,best:0.0920,worst:0.0925
magicsplit2 takes:1.0221,avg:2.04e-04,best:0.1018,worst:0.1034
ssplit takes:0.8294,avg:1.66e-04,best:0.0818,worst:0.0834
ssplit2 takes:0.9911,avg:1.98e-04,best:0.0983,worst:0.1014
split_on takes:1.5672,avg:3.13e-04,best:0.1543,worst:0.1694
500x10 times: 'split m... me,',' , , , ... , ,'
isplit_kabie takes:2.1847,avg:4.37e-04,best:0.2164,worst:0.2275
magicsplit takes:3.7135,avg:7.43e-04,best:0.3693,worst:0.3783
magicsplit2 takes:3.8104,avg:7.62e-04,best:0.3795,worst:0.3884
ssplit takes:0.9522,avg:1.90e-04,best:0.0939,worst:0.0956
ssplit2 takes:1.0140,avg:2.03e-04,best:0.1009,worst:0.1023
split_on takes:1.5747,avg:3.15e-04,best:0.1563,worst:0.1615
500x10 times: 'split m...ase!',' ,!'
isplit_kabie takes:3.3443,avg:6.69e-04,best:0.3324,worst:0.3380
magicsplit takes:2.0594,avg:4.12e-04,best:0.2054,worst:0.2076
magicsplit2 takes:2.1850,avg:4.37e-04,best:0.2180,worst:0.2191
ssplit takes:1.4881,avg:2.98e-04,best:0.1484,worst:0.1493
ssplit2 takes:1.8779,avg:3.76e-04,best:0.1868,worst:0.1920
split_on takes:2.9596,avg:5.92e-04,best:0.2946,worst:0.2980
500x10 times: range(0, 100),range(0, 100)
isplit_kabie takes:0.9445,avg:1.89e-04,best:0.0933,worst:0.1023
magicsplit takes:0.5878,avg:1.18e-04,best:0.0583,worst:0.0593
magicsplit2 takes:0.5597,avg:1.12e-04,best:0.0554,worst:0.0588
ssplit takes:0.8568,avg:1.71e-04,best:0.0852,worst:0.0874
ssplit2 takes:0.1399,avg:2.80e-05,best:0.0121,worst:0.0242
split_on takes:0.1462,avg:2.92e-05,best:0.0145,worst:0.0148
500x10 times: range(0, 100),range(101, 1000)
isplit_kabie takes:19.9749,avg:3.99e-03,best:1.9789,worst:2.0330
magicsplit takes:9.4997,avg:1.90e-03,best:0.9369,worst:0.9640
magicsplit2 takes:9.4394,avg:1.89e-03,best:0.9267,worst:0.9665
ssplit takes:19.2363,avg:3.85e-03,best:1.8936,worst:1.9516
ssplit2 takes:0.2032,avg:4.06e-05,best:0.0201,worst:0.0205
split_on takes:0.3329,avg:6.66e-05,best:0.0323,worst:0.0344
500x10 times: range(0, 100),range(50, 150)
isplit_kabie takes:1.1394,avg:2.28e-04,best:0.1130,worst:0.1153
magicsplit takes:0.7288,avg:1.46e-04,best:0.0721,worst:0.0760
magicsplit2 takes:0.7220,avg:1.44e-04,best:0.0705,worst:0.0774
ssplit takes:1.0835,avg:2.17e-04,best:0.1059,worst:0.1116
ssplit2 takes:0.1092,avg:2.18e-05,best:0.0105,worst:0.0116
split_on takes:0.1639,avg:3.28e-05,best:0.0162,worst:0.0168
500x10 times: [0, 1, 2..., 99],(99,)
isplit_kabie takes:3.2579,avg:6.52e-04,best:0.3225,worst:0.3360
magicsplit takes:2.2937,avg:4.59e-04,best:0.2274,worst:0.2344
magicsplit2 takes:2.6054,avg:5.21e-04,best:0.2587,worst:0.2642
ssplit takes:1.5251,avg:3.05e-04,best:0.1495,worst:0.1729
ssplit2 takes:1.7298,avg:3.46e-04,best:0.1696,worst:0.1858
split_on takes:4.1041,avg:8.21e-04,best:0.4033,worst:0.4291
El código de Ryan ligeramente modificado, espero que no te importe. ssplit se basó en la idea de Karl. Se agregaron declaraciones que manejan algunos casos especiales para convertirse en ssplit2, que es la mejor solución que puedo proporcionar.
Algo como esto:
def _itersplit(l, splitters):
current = []
for item in l:
if item in splitters:
yield current
current = []
else:
current.append(item)
yield current
def magicsplit(l, *splitters):
return [subl for subl in _itersplit(l, splitters) if subl]
me atrapa:
>>> l = [1, 4, None, 6, 9, None, 3, 9, 4 ]
>>> magicsplit(l, None)
[[1, 4], [6, 9], [3, 9, 4]]
>>> magicsplit(l, None, 9)
[[1, 4], [6], [3], [4]]
Puede encontrar los índices de los elementos “delimitadores”. Por ejemplo, los índices de Ninguno son 2 y 5 (de base cero). Puede usarlos, junto con la longitud de la lista, para construir una lista de tuplas. [ (0,1), (3,4), (6,8) ] que representan los índices de inicio y final de las sublistas. Luego, puede usar una lista de comprensión sobre esta lista de tuplas para extraer sublistas.
Si tienes algún titubeo y disposición de progresar nuestro enunciado puedes realizar una disquisición y con gusto lo interpretaremos.
¡Haz clic para puntuar esta entrada!
(Votos: 0 Promedio: 0)