Skip to content

BUG: misleading error creating df from 2d array #42646

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 6 commits into from
Jul 28, 2021
Merged

BUG: misleading error creating df from 2d array #42646

Show file tree
Hide file tree
Changes from 3 commits
Commits
Show all changes
6 commits
Select commit Hold shift + click to select a range
f4dc916
BUG: misleading error creating df from 2d array
debnathshoham Jul 21, 2021
8d968f2
amended as suggested
debnathshoham Jul 24, 2021
b189f10
changed error msg as suggested
debnathshoham Jul 26, 2021
4bb7180
updated error msg
debnathshoham Jul 27, 2021
b6381df
included whatsnew
debnathshoham Jul 28, 2021
a09ac37
Merge branch 'master' into 42463
debnathshoham Jul 28, 2021
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 2 additions & 0 deletions pandas/core/internals/construction.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -615,6 +615,8 @@ def _extract_index(data) -> Index:
elif is_list_like(val) and getattr(val, "ndim", 1) == 1:
have_raw_arrays = True
raw_lengths.append(len(val))
elif isinstance(val, np.ndarray) and val.ndim > 1:
raise ValueError("Per-column arrays must each be 1-dimensional")

if not indexes and not raw_lengths:
raise ValueError("If using all scalar values, you must pass an index")
Expand Down
13 changes: 13 additions & 0 deletions pandas/tests/frame/test_constructors.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -2530,6 +2530,19 @@ def test_from_2d_object_array_of_periods_or_intervals(self):
expected = DataFrame({0: pi, 1: ii, 2: pi, 3: ii})
tm.assert_frame_equal(df3, expected)

@pytest.mark.parametrize(
"col_a, col_b",
[
([[1], [2]], np.array([[1], [2]])),
(np.array([[1], [2]]), [[1], [2]]),
(np.array([[1], [2]]), np.array([[1], [2]])),
],
)
def test_error_from_2darray(self, col_a, col_b):
msg = "Data must be 1-dimensional"
Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

probably need to update the message here?

Copy link
Member Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

My bad. Updated the msg in test.

with pytest.raises(ValueError, match=msg):
DataFrame({"a": col_a, "b": col_b})


class TestDataFrameConstructorWithDtypeCoercion:
def test_floating_values_integer_dtype(self):
Expand Down