/
extended_unpacking_T235.pyx
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/
extended_unpacking_T235.pyx
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# ticket: 235
__doc__ = u"""
>>> class FakeSeq(object):
... def __init__(self, length):
... self._values = list(range(1,length+1))
... def __getitem__(self, i):
... return self._values[i]
>>> unpack( FakeSeq(2) )
(1, 2)
>>> unpack_recursive( FakeSeq(4) )
(1, [2, 3], 4)
"""
def unpack(l):
"""
>>> unpack([1,2])
(1, 2)
>>> unpack('12')
('1', '2')
"""
a, b = l
return a,b
def unpack_list(list l):
"""
>>> unpack_list([1,2])
(1, 2)
"""
a, b = l
return a,b
def unpack_tuple(tuple t):
"""
>>> unpack_tuple((1,2))
(1, 2)
"""
a, b = t
return a,b
def unpack_single(l):
"""
>>> unpack_single([1])
[1]
>>> unpack_single('1')
['1']
"""
*a, = l
return a
def unpack_tuple_single(tuple t):
"""
>>> unpack_tuple_single((1,))
[1]
"""
*a, = t
return a
def assign():
"""
>>> assign()
(1, [2, 3, 4], 5)
"""
*a, b = 1,2,3,4,5
assert a+[b] == [1,2,3,4,5], (a,b)
a, *b = 1,2,3,4,5
assert [a]+b == [1,2,3,4,5], (a,b)
[a, *b, c] = 1,2,3,4,5
return a,b,c
def unpack_into_list(l):
"""
>>> unpack_into_list('123')
('1', ['2'], '3')
"""
[*a, b] = l
assert a+[b] == list(l), repr((a+[b],list(l)))
[a, *b] = l
assert [a]+b == list(l), repr(([a]+b,list(l)))
[a, *b, c] = l
return a,b,c
def unpack_into_tuple(t):
"""
>>> unpack_into_tuple('123')
('1', ['2'], '3')
"""
(*a, b) = t
assert a+[b] == list(t), repr((a+[b],list(t)))
(a, *b) = t
assert [a]+b == list(t), repr(([a]+b,list(t)))
(a, *b, c) = t
return a,b,c
def unpack_in_loop(list_of_sequences):
"""
>>> unpack_in_loop([(1,2), (1,2,3), (1,2,3,4)])
1
([1], 2)
([1, 2], 3)
([1, 2, 3], 4)
2
(1, [2])
(1, [2, 3])
(1, [2, 3, 4])
3
(1, [], 2)
(1, [2], 3)
(1, [2, 3], 4)
"""
print 1
for *a,b in list_of_sequences:
print((a,b))
print 2
for a,*b in list_of_sequences:
print((a,b))
print 3
for a,*b, c in list_of_sequences:
print((a,b,c))
def unpack_recursive(t):
"""
>>> unpack_recursive((1,2,3,4))
(1, [2, 3], 4)
"""
*(a, *b), c = t
return a,b,c
def unpack_typed(t):
"""
>>> unpack_typed((1,2))
([1], 2)
"""
cdef list a
*a, b = t
return a,b
def unpack_right(l):
"""
>>> unpack_right('')
Traceback (most recent call last):
ValueError: need more than 0 values to unpack
>>> unpack_right('1')
('1', [])
>>> unpack_right([1])
(1, [])
>>> unpack_right('12')
('1', ['2'])
>>> unpack_right([1,2])
(1, [2])
>>> unpack_right('123')
('1', ['2', '3'])
>>> unpack_right([1,2,3])
(1, [2, 3])
"""
a, *b = l
return a,b
def unpack_right_list(list l):
"""
>>> unpack_right_list([])
Traceback (most recent call last):
ValueError: need more than 0 values to unpack
>>> unpack_right_list([1])
(1, [])
>>> unpack_right_list([1,2])
(1, [2])
>>> unpack_right_list([1,2,3])
(1, [2, 3])
"""
a, *b = l
return a,b
def unpack_right_tuple(tuple t):
"""
>>> unpack_right_tuple(())
Traceback (most recent call last):
ValueError: need more than 0 values to unpack
>>> unpack_right_tuple((1,))
(1, [])
>>> unpack_right_tuple((1,2))
(1, [2])
>>> unpack_right_tuple((1,2,3))
(1, [2, 3])
"""
a, *b = t
return a,b
def unpack_left(l):
"""
>>> unpack_left('')
Traceback (most recent call last):
ValueError: need more than 0 values to unpack
>>> unpack_left('1')
([], '1')
>>> unpack_left([1])
([], 1)
>>> unpack_left('12')
(['1'], '2')
>>> unpack_left([1,2])
([1], 2)
>>> unpack_left('123')
(['1', '2'], '3')
>>> unpack_left([1,2,3])
([1, 2], 3)
"""
*a, b = l
return a,b
def unpack_left_list(list l):
"""
>>> unpack_left_list([])
Traceback (most recent call last):
ValueError: need more than 0 values to unpack
>>> unpack_left_list([1])
([], 1)
>>> unpack_left_list([1,2])
([1], 2)
>>> unpack_left_list([1,2,3])
([1, 2], 3)
"""
*a, b = l
return a,b
def unpack_left_tuple(tuple t):
"""
>>> unpack_left_tuple(())
Traceback (most recent call last):
ValueError: need more than 0 values to unpack
>>> unpack_left_tuple((1,))
([], 1)
>>> unpack_left_tuple((1,2))
([1], 2)
>>> unpack_left_tuple((1,2,3))
([1, 2], 3)
"""
*a, b = t
return a,b
def unpack_middle(l):
"""
>>> unpack_middle('')
Traceback (most recent call last):
ValueError: need more than 0 values to unpack
>>> unpack_middle([])
Traceback (most recent call last):
ValueError: need more than 0 values to unpack
>>> unpack_middle(())
Traceback (most recent call last):
ValueError: need more than 0 values to unpack
>>> unpack_middle('1')
Traceback (most recent call last):
ValueError: need more than 1 value to unpack
>>> unpack_middle([1])
Traceback (most recent call last):
ValueError: need more than 1 value to unpack
>>> unpack_middle('12')
('1', [], '2')
>>> unpack_middle([1,2])
(1, [], 2)
>>> unpack_middle('123')
('1', ['2'], '3')
>>> unpack_middle([1,2,3])
(1, [2], 3)
"""
a, *b, c = l
return a,b,c
def unpack_middle_list(list l):
"""
>>> unpack_middle_list([])
Traceback (most recent call last):
ValueError: need more than 0 values to unpack
>>> unpack_middle_list([1])
Traceback (most recent call last):
ValueError: need more than 1 value to unpack
>>> unpack_middle_list([1,2])
(1, [], 2)
>>> unpack_middle_list([1,2,3])
(1, [2], 3)
"""
a, *b, c = l
return a,b,c
def unpack_middle_tuple(tuple t):
"""
>>> unpack_middle_tuple(())
Traceback (most recent call last):
ValueError: need more than 0 values to unpack
>>> unpack_middle_tuple((1,))
Traceback (most recent call last):
ValueError: need more than 1 value to unpack
>>> unpack_middle_tuple((1,2))
(1, [], 2)
>>> unpack_middle_tuple((1,2,3))
(1, [2], 3)
>>> a,b,c = unpack_middle(list(range(100)))
>>> a, len(b), c
(0, 98, 99)
>>> a,b,c = unpack_middle_list(list(range(100)))
>>> a, len(b), c
(0, 98, 99)
>>> a,b,c = unpack_middle_tuple(tuple(range(100)))
>>> a, len(b), c
(0, 98, 99)
"""
a, *b, c = t
return a,b,c
def unpack_many_middle(it):
"""
>>> unpack_many_middle(list(range(14)))
(0, 1, 2, 3, 4, [5, 6, 7, 8, 9], 10, 11, 12, 13)
>>> unpack_many_middle(tuple(range(14)))
(0, 1, 2, 3, 4, [5, 6, 7, 8, 9], 10, 11, 12, 13)
>>> unpack_many_middle(iter(range(14)))
(0, 1, 2, 3, 4, [5, 6, 7, 8, 9], 10, 11, 12, 13)
"""
a,b,c,d,e,*f,g,h,i,j = it
return a,b,c,d,e,f,g,h,i,j
def unpack_many_left(it):
"""
>>> unpack_many_left(list(range(14)))
(0, 1, 2, 3, 4, 5, 6, 7, 8, [9, 10, 11, 12, 13])
>>> unpack_many_left(tuple(range(14)))
(0, 1, 2, 3, 4, 5, 6, 7, 8, [9, 10, 11, 12, 13])
>>> unpack_many_left(iter(range(14)))
(0, 1, 2, 3, 4, 5, 6, 7, 8, [9, 10, 11, 12, 13])
"""
a,b,c,d,e,f,g,h,i,*j = it
return a,b,c,d,e,f,g,h,i,j
def unpack_many_right(it):
"""
>>> unpack_many_right(list(range(14)))
([0, 1, 2, 3, 4], 5, 6, 7, 8, 9, 10, 11, 12, 13)
>>> unpack_many_right(tuple(range(14)))
([0, 1, 2, 3, 4], 5, 6, 7, 8, 9, 10, 11, 12, 13)
>>> unpack_many_right(iter(range(14)))
([0, 1, 2, 3, 4], 5, 6, 7, 8, 9, 10, 11, 12, 13)
"""
*a,b,c,d,e,f,g,h,i,j = it
return a,b,c,d,e,f,g,h,i,j
def unpack_many_right_loop(it):
"""
>>> unpack_many_right_loop(list(range(14)))
([0, 1, 2, 3, 4], 5, 6, 7, 8, 9, 10, 11, 12, 13)
>>> unpack_many_right_loop(tuple(range(14)))
([0, 1, 2, 3, 4], 5, 6, 7, 8, 9, 10, 11, 12, 13)
>>> unpack_many_right_loop(iter(range(14)))
([0, 1, 2, 3, 4], 5, 6, 7, 8, 9, 10, 11, 12, 13)
"""
cdef int i
for i in range(1):
*a,b,c,d,e,f,g,h,i,j = it
return a,b,c,d,e,f,g,h,i,j