Backport PR #50698 on branch 1.5.x (CI capture error in numpy dev, fix python-dev build)

.github/workflows/python-dev.yml

@@ -73,7 +73,7 @@ jobs:
  run: |
  python --version
  python -m pip install --upgrade pip setuptools wheel
- python -m pip install -i https://pypi.anaconda.org/scipy-wheels-nightly/simple numpy
+ python -m pip install --extra-index-url https://pypi.anaconda.org/scipy-wheels-nightly/simple numpy
  python -m pip install git+https://github.com/nedbat/coveragepy.git
  python -m pip install python-dateutil pytz cython hypothesis==6.52.1 pytest>=6.2.5 pytest-xdist pytest-cov pytest-asyncio>=0.17
  python -m pip list

pandas/tests/frame/test_unary.py

@@ -3,6 +3,8 @@
 import numpy as np
 import pytest
 
+from pandas.compat import is_numpy_dev
+
 import pandas as pd
 import pandas._testing as tm
 
@@ -98,11 +100,6 @@ def test_pos_numeric(self, df):
  @pytest.mark.parametrize(
  "df",
  [
- # numpy changing behavior in the future
- pytest.param(
- pd.DataFrame({"a": ["a", "b"]}),
- marks=[pytest.mark.filterwarnings("ignore")],
- ),
  pd.DataFrame({"a": np.array([-1, 2], dtype=object)}),
  pd.DataFrame({"a": [Decimal("-1.0"), Decimal("2.0")]}),
  ],
@@ -112,6 +109,25 @@ def test_pos_object(self, df):
  tm.assert_frame_equal(+df, df)
  tm.assert_series_equal(+df["a"], df["a"])
 
+ @pytest.mark.parametrize(
+ "df",
+ [
+ pytest.param(
+ pd.DataFrame({"a": ["a", "b"]}),
+ marks=[pytest.mark.filterwarnings("ignore")],
+ ),
+ ],
+ )
+ def test_pos_object_raises(self, df):
+ # GH#21380
+ if is_numpy_dev:
+ with pytest.raises(
+ TypeError, match=r"^bad operand type for unary \+: \'str\'$"
+ ):
+ tm.assert_frame_equal(+df, df)
+ else:
+ tm.assert_series_equal(+df["a"], df["a"])
+
  @pytest.mark.parametrize(
  "df", [pd.DataFrame({"a": pd.to_datetime(["2017-01-22", "1970-01-01"])})]
  )