def test_reduceby():
data = [1, 2, 3, 4, 5]
iseven = lambda x: x % 2 == 0
assert reduceby(iseven, add, data, 0) == {False: 9, True: 6}
assert reduceby(iseven, mul, data, 1) == {False: 15, True: 8}
projects = [{
'name': 'build roads',
'state': 'CA',
'cost': 1000000
}, {
'name': 'fight crime',
'state': 'IL',
'cost': 100000
}, {
'name': 'help farmers',
'state': 'IL',
'cost': 2000000
}, {
'name': 'help farmers',
'state': 'CA',
'cost': 200000
}]
assert reduceby(lambda x: x['state'], lambda acc, x: acc + x['cost'],
projects, 0) == {
'CA': 1200000,
'IL': 2100000
}
assert reduceby('state', lambda acc, x: acc + x['cost'], projects, 0) == {
'CA': 1200000,
'IL': 2100000
}
def test_reduceby():
data = [1, 2, 3, 4, 5]
iseven = lambda x: x % 2 == 0
assert reduceby(iseven, add, data, 0) == {False: 9, True: 6}
assert reduceby(iseven, mul, data, 1) == {False: 15, True: 8}
projects = [{'name': 'build roads', 'state': 'CA', 'cost': 1000000},
{'name': 'fight crime', 'state': 'IL', 'cost': 100000},
{'name': 'help farmers', 'state': 'IL', 'cost': 2000000},
{'name': 'help farmers', 'state': 'CA', 'cost': 200000}]
assert reduceby(lambda x: x['state'],
lambda acc, x: acc + x['cost'],
projects, 0) == {'CA': 1200000, 'IL': 2100000}
def test_reduce_by_callable_default():
def set_add(s, i):
s.add(i)
return s
assert reduceby(iseven, set_add, [1, 2, 3, 4, 1, 2], set) == \
{True: {2, 4}, False: {1, 3}}
def test_reduce_by_callable_default():
def set_add(s, i):
s.add(i)
return s
assert reduceby(iseven, set_add, [1, 2, 3, 4, 1, 2], set) == \
{True: set([2, 4]), False: set([1, 3])}
def test_reduce_by_init():
assert reduceby(iseven, add, [1, 2, 3, 4]) == {True: 2 + 4, False: 1 + 3}
def test_reduce_by_init():
assert reduceby(iseven, add, [1, 2, 3, 4]) == {True: 2 + 4, False: 1 + 3}
assert reduceby(iseven, add, [1, 2, 3, 4], no_default2) == {
True: 2 + 4,
False: 1 + 3
}