"During handling of the above exception, another exception occurred" with DataFrames

[dpinol]

The following test...

        df1 = pl.DataFrame({"a": [1, 2], "b": [4, 5]})
        df2 = pl.DataFrame({"a": [1, 2], "b": [4, 6]})
        assert_that(df1).is_frame_equal(df2)

Causes a long callstack, with duplicated AssertionError details, and message "During handling of the above exception, another exception occurred"

One solution could be adding from None to raise AssertionFailure(...) within AssertionBuilder.error, or only adding it when a from_none flag is passed to the function. I'm happy to create a PR for any design you prefer.

―――――――――――――――――――――― Test_DataFrame.test_is_frame_equal ――――――――――――――――――――――
.venv/lib/python3.14/site-packages/polars/_utils/deprecation.py:132: in wrapper
    return function(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
.venv/lib/python3.14/site-packages/polars/_utils/deprecation.py:132: in wrapper
    return function(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
.venv/lib/python3.14/site-packages/polars/_utils/deprecation.py:132: in wrapper
    return function(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
E   AssertionError: DataFrames are different (value mismatch for column "b")
E   [left]: shape: (2,)
E   Series: 'b' [i64]
E   [
E   	4
E   	5
E   ]
E   [right]: shape: (2,)
E   Series: 'b' [i64]
E   [
E   	4
E   	6
E   ]

During handling of the above exception, another exception occurred:
test/utils/test_asserts.py:468: in test_is_frame_equal
    assert_that(df1).is_frame_equal(df2)
E   AssertionError: Expected the DataFrame to equal the expected one, but they differ:
E   DataFrames are different (value mismatch for column "b")
E   [left]: shape: (2,)
E   Series: 'b' [i64]
E   [
E   	4
E   	5
E   ]
E   [right]: shape: (2,)
E   Series: 'b' [i64]
E   [
E   	4
E   	6
E   ]

[Solganis]

I will look into this asap after vacation.

Thanks for the report!