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"""Check unpacking non-sequences in assignments. """
# pylint: disable=too-few-public-methods, invalid-name, attribute-defined-outside-init, unused-variable, no-absolute-import
# pylint: disable=using-constant-test, no-init
from os import rename as nonseq_func
from functional.unpacking import nonseq
from six import with_metaclass
__revision__ = 0
# Working
class Seq(object):
""" sequence """
def __init__(self):
self.items = range(2)
def __getitem__(self, item):
return self.items[item]
def __len__(self):
return len(self.items)
class Iter(object):
""" Iterator """
def __iter__(self):
for number in range(2):
yield number
def good_unpacking():
""" returns should be unpackable """
if True:
return [1, 2]
else:
return (3, 4)
def good_unpacking2():
""" returns should be unpackable """
return good_unpacking()
class MetaIter(type):
"metaclass that makes classes that use it iterables"
def __iter__(cls):
return iter((1, 2))
class IterClass(with_metaclass(MetaIter)):
"class that is iterable (and unpackable)"
class AbstrClass(object):
"abstract class"
pair = None
def setup_pair(self):
"abstract method"
raise NotImplementedError
def __init__(self):
"error should not be emitted because setup_pair is abstract"
self.setup_pair()
x, y = self.pair
a, b = [1, 2]
a, b = (1, 2)
a, b = set([1, 2])
a, b = {1: 2, 2: 3}
a, b = "xy"
a, b = Seq()
a, b = Iter()
a, b = (number for number in range(2))
a, b = good_unpacking()
a, b = good_unpacking2()
a, b = IterClass
# Not working
class NonSeq(object):
""" does nothing """
def bad_unpacking():
""" one return isn't unpackable """
if True:
return None
return [1, 2]
a, b = NonSeq() # [unpacking-non-sequence]
a, b = ValueError # [unpacking-non-sequence]
a, b = None # [unpacking-non-sequence]
a, b = 1 # [unpacking-non-sequence]
a, b = nonseq # [unpacking-non-sequence]
a, b = nonseq() # [unpacking-non-sequence]
a, b = bad_unpacking() # [unpacking-non-sequence]
a, b = nonseq_func # [unpacking-non-sequence]
class ClassUnpacking(object):
""" Check unpacking as instance attributes. """
def test(self):
""" test unpacking in instance attributes. """
self.a, self.b = 1, 2
self.a, self.b = {1: 2, 2: 3}
self.a, self.b = "xy"
self.a, c = "xy"
c, self.a = good_unpacking()
self.a, self.b = Iter()
self.a, self.b = NonSeq() # [unpacking-non-sequence]
self.a, self.b = ValueError # [unpacking-non-sequence]
self.a, self.b = bad_unpacking() # [unpacking-non-sequence]
self.a, c = nonseq_func # [unpacking-non-sequence]
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