def test_diff():
assert raises(TypeError, lambda: list(diff()))
assert raises(TypeError, lambda: list(diff([1, 2])))
assert raises(TypeError, lambda: list(diff([1, 2], 3)))
assert list(diff([1, 2], (1, 2), iter([1, 2]))) == []
assert list(diff([1, 2, 3], (1, 10, 3), iter([1, 2, 10]))) == [(2, 10, 2),
(3, 3, 10)]
assert list(diff([1, 2], [10])) == [(1, 10)]
assert list(diff([1, 2], [10], default=None)) == [(1, 10), (2, None)]
# non-variadic usage
assert raises(TypeError, lambda: list(diff([])))
assert raises(TypeError, lambda: list(diff([[]])))
assert raises(TypeError, lambda: list(diff([[1, 2]])))
assert raises(TypeError, lambda: list(diff([[1, 2], 3])))
assert list(diff([(1, 2), (1, 3)])) == [(2, 3)]
data1 = [{
'cost': 1,
'currency': 'dollar'
}, {
'cost': 2,
'currency': 'dollar'
}]
data2 = [{
'cost': 100,
'currency': 'yen'
}, {
'cost': 300,
'currency': 'yen'
}]
conversions = {'dollar': 1, 'yen': 0.01}
def indollars(item):
return conversions[item['currency']] * item['cost']
list(diff(data1, data2, key=indollars)) == [({
'cost': 2,
'currency': 'dollar'
}, {
'cost': 300,
'currency': 'yen'
})]
def test_diff():
assert raises(TypeError, lambda: list(diff()))
assert raises(TypeError, lambda: list(diff([1, 2])))
assert raises(TypeError, lambda: list(diff([1, 2], 3)))
assert list(diff([1, 2], (1, 2), iter([1, 2]))) == []
assert list(diff([1, 2, 3], (1, 10, 3), iter([1, 2, 10]))) == [
(2, 10, 2), (3, 3, 10)]
assert list(diff([1, 2], [10])) == [(1, 10)]
assert list(diff([1, 2], [10], default=None)) == [(1, 10), (2, None)]
# non-variadic usage
assert raises(TypeError, lambda: list(diff([])))
assert raises(TypeError, lambda: list(diff([[]])))
assert raises(TypeError, lambda: list(diff([[1, 2]])))
assert raises(TypeError, lambda: list(diff([[1, 2], 3])))
assert list(diff([(1, 2), (1, 3)])) == [(2, 3)]
data1 = [{'cost': 1, 'currency': 'dollar'},
{'cost': 2, 'currency': 'dollar'}]
data2 = [{'cost': 100, 'currency': 'yen'},
{'cost': 300, 'currency': 'yen'}]
conversions = {'dollar': 1, 'yen': 0.01}
def indollars(item):
return conversions[item['currency']] * item['cost']
list(diff(data1, data2, key=indollars)) == [
({'cost': 2, 'currency': 'dollar'}, {'cost': 300, 'currency': 'yen'})]