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Add test to check numeric precision GH33234 #51753

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Merged
merged 1 commit into from
Mar 13, 2023
Merged

Add test to check numeric precision GH33234 #51753

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27 changes: 27 additions & 0 deletions pandas/tests/groupby/aggregate/test_aggregate.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1377,6 +1377,33 @@ def func(ser):
tm.assert_frame_equal(res, expected)


def test_groupby_agg_precision(any_real_numeric_dtype):
if any_real_numeric_dtype in tm.ALL_INT_NUMPY_DTYPES:
max_value = np.iinfo(any_real_numeric_dtype).max
if any_real_numeric_dtype in tm.FLOAT_NUMPY_DTYPES:
max_value = np.finfo(any_real_numeric_dtype).max
if any_real_numeric_dtype in tm.FLOAT_EA_DTYPES:
max_value = np.finfo(any_real_numeric_dtype.lower()).max
if any_real_numeric_dtype in tm.ALL_INT_EA_DTYPES:
max_value = np.iinfo(any_real_numeric_dtype.lower()).max

df = DataFrame(
{
"key1": ["a"],
"key2": ["b"],
"key3": pd.array([max_value], dtype=any_real_numeric_dtype),
}
)
arrays = [["a"], ["b"]]
index = MultiIndex.from_arrays(arrays, names=("key1", "key2"))

expected = DataFrame(
{"key3": pd.array([max_value], dtype=any_real_numeric_dtype)}, index=index
)
result = df.groupby(["key1", "key2"]).agg(lambda x: x)
tm.assert_frame_equal(result, expected)


def test_groupby_aggregate_directory(reduction_func):
# GH#32793
if reduction_func in ["corrwith", "nth"]:
Expand Down