1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
|
# mode: run
# tag: sequence_unpacking
import cython
def _it(N):
for i in range(N):
yield i
cdef class ItCount(object):
cdef object values
cdef readonly count
def __init__(self, values):
self.values = iter(values)
self.count = 0
def __iter__(self):
return self
def __next__(self):
self.count += 1
return next(self.values)
def kunterbunt(obj1, obj2, obj3, obj4, obj5):
"""
>>> kunterbunt(1, (2,), (3,4,5), (6,(7,(8,9))), 0)
(8, 9, (8, 9), (6, (7, (8, 9))), 0)
"""
obj1, = obj2
obj1, obj2 = obj2 + obj2
obj1, obj2, obj3 = obj3
obj1, (obj2, obj3) = obj4
[obj1, obj2] = obj3
return obj1, obj2, obj3, obj4, obj5
def unpack_tuple(tuple it):
"""
>>> unpack_tuple((1,2,3))
(1, 2, 3)
>>> a,b,c = None # doctest: +ELLIPSIS
Traceback (most recent call last):
TypeError: ...
>>> unpack_tuple(None) # doctest: +ELLIPSIS
Traceback (most recent call last):
TypeError: ...
"""
a,b,c = it
return a,b,c
def unpack_list(list it):
"""
>>> unpack_list([1,2,3])
(1, 2, 3)
>>> a,b,c = None # doctest: +ELLIPSIS
Traceback (most recent call last):
TypeError: ...
>>> unpack_list(None) # doctest: +ELLIPSIS
Traceback (most recent call last):
TypeError: ...
"""
a,b,c = it
return a,b,c
def unpack_to_itself(it):
"""
>>> it = _it(2)
>>> it, it = it
>>> it
1
>>> unpack_to_itself([1,2])
2
>>> unpack_to_itself((1,2))
2
>>> unpack_to_itself(_it(2))
1
>>> unpack_to_itself((1,2,3))
Traceback (most recent call last):
ValueError: too many values to unpack (expected 2)
>>> unpack_to_itself(_it(3))
Traceback (most recent call last):
ValueError: too many values to unpack (expected 2)
"""
it, it = it
return it
def unpack_partial(it):
"""
>>> it = _it(2)
>>> a = b = c = 0
>>> try: a,b,c = it
... except ValueError: pass
... else: print("DID NOT FAIL!")
>>> a, b, c
(0, 0, 0)
>>> unpack_partial([1,2])
(0, 0, 0)
>>> unpack_partial((1,2))
(0, 0, 0)
>>> unpack_partial(_it(2))
(0, 0, 0)
>>> it = ItCount([1,2])
>>> a = b = c = 0
>>> try: a,b,c = it
... except ValueError: pass
... else: print("DID NOT FAIL!")
>>> a, b, c
(0, 0, 0)
>>> it.count
3
>>> it = ItCount([1,2])
>>> unpack_partial(it)
(0, 0, 0)
>>> it.count
3
"""
a = b = c = 0
try:
a, b, c = it
except ValueError:
pass
return a, b, c
def unpack_fail_assignment(it):
"""
>>> it = ItCount([1, 2, 3])
>>> a = b = c = 0
>>> try: a, b[0], c = it
... except TypeError: pass
>>> a,b,c
(1, 0, 0)
>>> it.count
4
>>> it = ItCount([1, 2, 3])
>>> unpack_fail_assignment(it)
(1, 0, 0)
>>> it.count
4
"""
cdef object a,b,c
a = b = c = 0
try:
a, b[0], c = it
except TypeError:
pass
return a, b, c
def unpack_partial_typed(it):
"""
>>> unpack_partial_typed([1, 2, 'abc'])
(0, 0, 0)
>>> unpack_partial_typed((1, 'abc', 3))
(0, 0, 0)
>>> unpack_partial_typed(set([1, 'abc', 3]))
(0, 0, 0)
>>> it = ItCount([1, 'abc', 3])
>>> unpack_partial_typed(it)
(0, 0, 0)
>>> it.count
4
"""
cdef int a,b,c
a = b = c = 0
try:
a, b, c = it
except TypeError:
pass
return a, b, c
def unpack_typed(it):
"""
>>> unpack_typed((1, 2.0, [1]))
(1, 2.0, [1])
>>> unpack_typed([1, 2.0, [1]])
(1, 2.0, [1])
>>> it = ItCount([1, 2.0, [1]])
>>> unpack_typed(it)
(1, 2.0, [1])
>>> it.count
4
>>> try: unpack_typed((1, None, [1]))
... except TypeError: pass
>>> try: unpack_typed([1, None, [1]])
... except TypeError: pass
>>> it = ItCount([1, None, [1]])
>>> try: unpack_typed(it)
... except TypeError: pass
>>> it.count
4
>>> unpack_typed((1, 2.0, (1,)))
Traceback (most recent call last):
TypeError: Expected list, got tuple
>>> it = ItCount([1, 2.0, (1,)])
>>> unpack_typed(it)
Traceback (most recent call last):
TypeError: Expected list, got tuple
>>> it.count
4
"""
cdef int a
cdef float b
cdef list c
a,b,c = it
return a,b,c
def failure_too_many(it):
"""
>>> try: a,b,c = [1,2,3,4]
... except ValueError: pass
>>> failure_too_many([1,2,3,4])
Traceback (most recent call last):
ValueError: too many values to unpack (expected 3)
>>> try: a,b,c = [1,2,3,4]
... except ValueError: pass
>>> failure_too_many((1,2,3,4))
Traceback (most recent call last):
ValueError: too many values to unpack (expected 3)
>>> a,b,c = set([1,2,3,4]) # doctest: +ELLIPSIS
Traceback (most recent call last):
ValueError: too many values to unpack...
>>> failure_too_many(set([1,2,3,4]))
Traceback (most recent call last):
ValueError: too many values to unpack (expected 3)
>>> a,b,c = _it(4) # doctest: +ELLIPSIS
Traceback (most recent call last):
ValueError: too many values to unpack...
>>> failure_too_many(_it(4))
Traceback (most recent call last):
ValueError: too many values to unpack (expected 3)
"""
a,b,c = it
return a,b,c
def failure_too_few(it):
"""
>>> try: a,b,c = [1,2]
... except ValueError: pass
>>> failure_too_few([1,2])
Traceback (most recent call last):
ValueError: need more than 2 values to unpack
>>> try: a,b,c = (1,2)
... except ValueError: pass
>>> failure_too_few((1,2))
Traceback (most recent call last):
ValueError: need more than 2 values to unpack
>>> try: a,b,c = set([1,2])
... except ValueError: pass
... else: print("DID NOT FAIL!")
>>> failure_too_few(set([1,2]))
Traceback (most recent call last):
ValueError: need more than 2 values to unpack
>>> try: a,b,c = _it(2)
... except ValueError: pass
... else: print("DID NOT FAIL!")
>>> failure_too_few(_it(2))
Traceback (most recent call last):
ValueError: need more than 2 values to unpack
"""
a,b,c = it
return a,b,c
def _it_failure(N):
for i in range(N):
yield i
raise ValueError("huhu")
def failure_while_unpacking(it):
"""
>>> a,b,c = _it_failure(0)
Traceback (most recent call last):
ValueError: huhu
>>> failure_while_unpacking(_it_failure(0))
Traceback (most recent call last):
ValueError: huhu
>>> a,b,c = _it_failure(1)
Traceback (most recent call last):
ValueError: huhu
>>> failure_while_unpacking(_it_failure(1))
Traceback (most recent call last):
ValueError: huhu
>>> a,b,c = _it_failure(2)
Traceback (most recent call last):
ValueError: huhu
>>> failure_while_unpacking(_it_failure(2))
Traceback (most recent call last):
ValueError: huhu
>>> a,b,c = _it_failure(3)
Traceback (most recent call last):
ValueError: huhu
>>> failure_while_unpacking(_it_failure(3))
Traceback (most recent call last):
ValueError: huhu
>>> a,b,c = _it_failure(4) # doctest: +ELLIPSIS
Traceback (most recent call last):
ValueError: too many values to unpack...
>>> failure_while_unpacking(_it_failure(4))
Traceback (most recent call last):
ValueError: too many values to unpack (expected 3)
"""
a,b,c = it
return a,b,c
def unpack_many(it):
"""
>>> items = range(1,13)
>>> unpack_many(items)
(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
>>> unpack_many(iter(items))
(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
>>> unpack_many(list(items))
(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
>>> unpack_many(tuple(items))
(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
"""
a,b,c,d,e,f,g,h,i,j,k,l = it
return a,b,c,d,e,f,g,h,i,j,k,l
def unpack_many_tuple(tuple it):
"""
>>> items = range(1,13)
>>> unpack_many_tuple(tuple(items))
(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
"""
a,b,c,d,e,f,g,h,i,j,k,l = it
return a,b,c,d,e,f,g,h,i,j,k,l
def unpack_many_list(list it):
"""
>>> items = range(1,13)
>>> unpack_many_list(list(items))
(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
"""
a,b,c,d,e,f,g,h,i,j,k,l = it
return a,b,c,d,e,f,g,h,i,j,k,l
def unpack_many_int(it):
"""
>>> items = range(1,13)
>>> unpack_many_int(items)
(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
>>> unpack_many_int(iter(items))
(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
>>> unpack_many_int(list(items))
(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
>>> unpack_many_int(tuple(items))
(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
"""
cdef int b
cdef long f
cdef Py_ssize_t h
a,b,c,d,e,f,g,h,i,j,k,l = it
return a,b,c,d,e,f,g,h,i,j,k,l
@cython.test_fail_if_path_exists('//PyTypeTestNode')
def unpack_literal_none_to_builtin_type():
"""
>>> unpack_literal_none_to_builtin_type()
(None, None, None, None)
"""
cdef list a,b,c,d
a, b = c, d = None, None
return a,b,c,d
cdef class ExtType:
pass
@cython.test_fail_if_path_exists('//PyTypeTestNode')
def unpack_literal_none_to_exttype():
"""
>>> unpack_literal_none_to_exttype()
(None, None, None, None)
"""
cdef ExtType a,b,c,d
a, b = c, d = None, None
return a,b,c,d
# Github issue #1523
def test_unpack_resultref():
"""
>>> test_unpack_resultref() == ((1, set()), 1, set())
True
"""
a = b, c = 1, set()
return a, b, c
|
