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TST: Added dataframe constructor tests confirming order is preserved with standard Python dicts #38206

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Merged
merged 1 commit into from
Dec 2, 2020
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TST: Added dataframe constructor tests confirming order is preserved with standard Python dicts #38206

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14 changes: 8 additions & 6 deletions pandas/tests/frame/test_constructors.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1238,32 +1238,34 @@ def test_constructor_single_row(self):
)
tm.assert_frame_equal(result, expected)

def test_constructor_ordered_dict_preserve_order(self):
@pytest.mark.parametrize("dict_type", [dict, OrderedDict])
def test_constructor_ordered_dict_preserve_order(self, dict_type):
# see gh-13304
expected = DataFrame([[2, 1]], columns=["b", "a"])

data = OrderedDict()
data = dict_type()
data["b"] = [2]
data["a"] = [1]

result = DataFrame(data)
tm.assert_frame_equal(result, expected)

data = OrderedDict()
data = dict_type()
data["b"] = 2
data["a"] = 1

result = DataFrame([data])
tm.assert_frame_equal(result, expected)

def test_constructor_ordered_dict_conflicting_orders(self):
@pytest.mark.parametrize("dict_type", [dict, OrderedDict])
def test_constructor_ordered_dict_conflicting_orders(self, dict_type):
# the first dict element sets the ordering for the DataFrame,
# even if there are conflicting orders from subsequent ones
row_one = OrderedDict()
row_one = dict_type()
row_one["b"] = 2
row_one["a"] = 1

row_two = OrderedDict()
row_two = dict_type()
row_two["a"] = 1
row_two["b"] = 2

Expand Down