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TST: new test for str to small float conversion dtype #29372

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Merged
merged 2 commits into from
Nov 3, 2019
Merged

TST: new test for str to small float conversion dtype #29372

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9ee8a77
add str to small float conversion type test
ganevgv Nov 2, 2019
5197b4f
restrucutre test
ganevgv Nov 3, 2019
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12 changes: 12 additions & 0 deletions pandas/tests/frame/test_dtypes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1063,6 +1063,18 @@ def test_asarray_homogenous(self):
expected = np.array([[1, 1], [2, 2]], dtype="object")
tm.assert_numpy_array_equal(result, expected)

def test_str_to_small_float_conversion_type(self):
# GH 20388
np.random.seed(13)
col_data = [str(np.random.random() * 1e-12) for _ in range(5)]
result = pd.DataFrame(col_data, columns=["A"])
expected = pd.DataFrame(col_data, columns=["A"], dtype=object)
tm.assert_frame_equal(result, expected)
# change the dtype of the elements from object to float one by one
result.loc[result.index, "A"] = [float(x) for x in col_data]
expected = pd.DataFrame(col_data, columns=["A"], dtype=float)
tm.assert_frame_equal(result, expected)


class TestDataFrameDatetimeWithTZ:
def test_interleave(self, timezone_frame):
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