MAINT: Clean up pandas/util/testing.py

Transform testing methods to use more
pytest idiom.

pandas/tests/groupby/test_timegrouper.py

@@ -571,8 +571,7 @@ def test_groupby_with_timezone_selection(self):
     def test_timezone_info(self):
         # GH 11682
         # Timezone info lost when broadcasting scalar datetime to DataFrame
-        tm._skip_if_no_pytz()
-        import pytz
+        pytz = pytest.importorskip("pytz")
 
         df = pd.DataFrame({'a': [1], 'b': [datetime.now(pytz.utc)]})
         assert df['b'][0].tzinfo == pytz.utc

pandas/tests/indexes/datetimes/test_astype.py

@@ -124,7 +124,7 @@ def test_astype_raises(self):
         pytest.raises(ValueError, idx.astype, 'datetime64[D]')
 
     def test_index_convert_to_datetime_array(self):
-        tm._skip_if_no_pytz()
+        pytest.importorskip("pytz")
 
         def _check_rng(rng):
             converted = rng.to_pydatetime()
@@ -143,8 +143,7 @@ def _check_rng(rng):
         _check_rng(rng_utc)
 
     def test_index_convert_to_datetime_array_explicit_pytz(self):
-        tm._skip_if_no_pytz()
-        import pytz
+        pytz = pytest.importorskip("pytz")
 
         def _check_rng(rng):
             converted = rng.to_pydatetime()
@@ -164,8 +163,7 @@ def _check_rng(rng):
         _check_rng(rng_utc)
 
     def test_index_convert_to_datetime_array_dateutil(self):
-        tm._skip_if_no_dateutil()
-        import dateutil
+        dateutil = pytest.importorskip("dateutil")
 
         def _check_rng(rng):
             converted = rng.to_pydatetime()
@@ -209,7 +207,7 @@ def test_to_period_microsecond(self):
         assert period[1] == Period('2007-01-01 10:11:13.789123Z', 'U')
 
     def test_to_period_tz_pytz(self):
-        tm._skip_if_no_pytz()
+        pytest.importorskip("pytz")
         from dateutil.tz import tzlocal
         from pytz import utc as UTC
 
@@ -240,8 +238,7 @@ def test_to_period_tz_pytz(self):
         tm.assert_index_equal(ts.to_period(), xp)
 
     def test_to_period_tz_explicit_pytz(self):
-        tm._skip_if_no_pytz()
-        import pytz
+        pytz = pytest.importorskip("pytz")
         from dateutil.tz import tzlocal
 
         xp = date_range('1/1/2000', '4/1/2000').to_period()
@@ -271,8 +268,7 @@ def test_to_period_tz_explicit_pytz(self):
         tm.assert_index_equal(ts.to_period(), xp)
 
     def test_to_period_tz_dateutil(self):
-        tm._skip_if_no_dateutil()
-        import dateutil
+        dateutil = pytest.importorskip("dateutil")
         from dateutil.tz import tzlocal
 
         xp = date_range('1/1/2000', '4/1/2000').to_period()

pandas/tests/indexes/datetimes/test_construction.py

@@ -350,9 +350,9 @@ def test_constructor_coverage(self):
         pytest.raises(ValueError, DatetimeIndex, periods=10, freq='D')
 
     def test_constructor_datetime64_tzformat(self):
-        # GH 6572
-        tm._skip_if_no_pytz()
-        import pytz
+        # see gh-6572
+        pytz = pytest.importorskip("pytz")
+
         # ISO 8601 format results in pytz.FixedOffset
         for freq in ['AS', 'W-SUN']:
             idx = date_range('2013-01-01T00:00:00-05:00',
@@ -376,7 +376,7 @@ def test_constructor_datetime64_tzformat(self):
                                      tz='Asia/Tokyo')
             tm.assert_numpy_array_equal(idx.asi8, expected_i8.asi8)
 
-        tm._skip_if_no_dateutil()
+        pytest.importorskip("dateutil")
 
         # Non ISO 8601 format results in dateutil.tz.tzoffset
         for freq in ['AS', 'W-SUN']:

pandas/tests/indexes/datetimes/test_date_range.py

@@ -300,7 +300,7 @@ def test_range_bug(self):
 
     def test_range_tz_pytz(self):
         # GH 2906
-        tm._skip_if_no_pytz()
+        pytest.importorskip("pytz")
         from pytz import timezone
 
         tz = timezone('US/Eastern')
@@ -324,7 +324,7 @@ def test_range_tz_pytz(self):
 
     def test_range_tz_dst_straddle_pytz(self):
 
-        tm._skip_if_no_pytz()
+        pytest.importorskip("pytz")
         from pytz import timezone
         tz = timezone('US/Eastern')
         dates = [(tz.localize(datetime(2014, 3, 6)),
@@ -349,8 +349,9 @@ def test_range_tz_dst_straddle_pytz(self):
             assert np.all(dr.hour == 0)
 
     def test_range_tz_dateutil(self):
-        # GH 2906
-        tm._skip_if_no_dateutil()
+        # see gh-2906
+        pytest.importorskip("dateutil")
+
         # Use maybe_get_tz to fix filename in tz under dateutil.
         from pandas._libs.tslib import maybe_get_tz
         tz = lambda x: maybe_get_tz('dateutil/' + x)

pandas/tests/indexes/datetimes/test_datetime.py

@@ -364,10 +364,8 @@ def test_map(self):
 
     def test_iteration_preserves_tz(self):
 
-        tm._skip_if_no_dateutil()
-
-        # GH 8890
-        import dateutil
+        # see gh-8890
+        dateutil = pytest.importorskip("dateutil")
         index = date_range("2012-01-01", periods=3, freq='H', tz='US/Eastern')
 
         for i, ts in enumerate(index):

pandas/tests/indexes/datetimes/test_indexing.py

@@ -97,9 +97,8 @@ def test_insert(self):
         assert result.name == expected.name
         assert result.freq is None
 
-        # GH 7299
-        tm._skip_if_no_pytz()
-        import pytz
+        # see gh-7299
+        pytz = pytest.importorskip("pytz")
 
         idx = date_range('1/1/2000', periods=3, freq='D', tz='Asia/Tokyo',
                          name='idx')

pandas/tests/indexes/datetimes/test_ops.py

@@ -1177,13 +1177,11 @@ def test_summary(self):
         self.rng[2:2].summary()
 
     def test_summary_pytz(self):
-        tm._skip_if_no_pytz()
-        import pytz
+        pytz = pytest.importorskip("pytz")
         bdate_range('1/1/2005', '1/1/2009', tz=pytz.utc).summary()
 
     def test_summary_dateutil(self):
-        tm._skip_if_no_dateutil()
-        import dateutil
+        dateutil = pytest.importorskip("dateutil")
         bdate_range('1/1/2005', '1/1/2009', tz=dateutil.tz.tzutc()).summary()
 
     def test_equals(self):
@@ -1279,13 +1277,11 @@ def test_summary(self):
         self.rng[2:2].summary()
 
     def test_summary_pytz(self):
-        tm._skip_if_no_pytz()
-        import pytz
+        pytz = pytest.importorskip("pytz")
         cdate_range('1/1/2005', '1/1/2009', tz=pytz.utc).summary()
 
     def test_summary_dateutil(self):
-        tm._skip_if_no_dateutil()
-        import dateutil
+        dateutil = pytest.importorskip("dateutil")
         cdate_range('1/1/2005', '1/1/2009', tz=dateutil.tz.tzutc()).summary()
 
     def test_equals(self):

pandas/tests/indexes/datetimes/test_setops.py

@@ -1,5 +1,6 @@
 from datetime import datetime
 
+import pytest
 import numpy as np
 
 import pandas as pd
@@ -306,7 +307,7 @@ def test_intersection_bug(self):
         tm.assert_index_equal(result, b)
 
     def test_month_range_union_tz_pytz(self):
-        tm._skip_if_no_pytz()
+        pytest.importorskip("pytz")
         from pytz import timezone
         tz = timezone('US/Eastern')
 
@@ -325,7 +326,7 @@ def test_month_range_union_tz_pytz(self):
 
     def test_month_range_union_tz_dateutil(self):
         tm._skip_if_windows_python_3()
-        tm._skip_if_no_dateutil()
+        pytest.importorskip("dateutil")
         from pandas._libs.tslib import _dateutil_gettz as timezone
         tz = timezone('US/Eastern')
 

pandas/tests/indexes/datetimes/test_tools.py

@@ -245,9 +245,8 @@ def test_to_datetime_tz(self):
 
     def test_to_datetime_tz_pytz(self):
 
-        # xref 8260
-        tm._skip_if_no_pytz()
-        import pytz
+        # see gh-8260
+        pytz = pytest.importorskip("pytz")
 
         us_eastern = pytz.timezone('US/Eastern')
         arr = np.array([us_eastern.localize(datetime(year=2000, month=1, day=1,
@@ -1124,8 +1123,6 @@ def test_parsers_quarter_invalid(self):
             pytest.raises(ValueError, tools.parse_time_string, case)
 
     def test_parsers_dayfirst_yearfirst(self):
-        tm._skip_if_no_dateutil()
-
         # OK
         # 2.5.1 10-11-12   [dayfirst=0, yearfirst=0] -> 2012-10-11 00:00:00
         # 2.5.2 10-11-12   [dayfirst=0, yearfirst=1] -> 2012-10-11 00:00:00
@@ -1166,7 +1163,7 @@ def test_parsers_dayfirst_yearfirst(self):
         # 2.5.2 20/12/21   [dayfirst=1, yearfirst=0] -> 2021-12-20 00:00:00
         # 2.5.3 20/12/21   [dayfirst=1, yearfirst=0] -> 2021-12-20 00:00:00
 
-        import dateutil
+        dateutil = pytest.importorskip("dateutil")
         is_lt_253 = dateutil.__version__ < LooseVersion('2.5.3')
 
         # str : dayfirst, yearfirst, expected
@@ -1221,7 +1218,7 @@ def test_parsers_dayfirst_yearfirst(self):
                 assert result4 == expected
 
     def test_parsers_timestring(self):
-        tm._skip_if_no_dateutil()
+        pytest.importorskip("dateutil")
         from dateutil.parser import parse
 
         # must be the same as dateutil result

pandas/tests/io/formats/test_format.py

@@ -1548,17 +1548,15 @@ def get_ipython():
 
     def test_pprint_pathological_object(self):
         """
-        if the test fails, the stack will overflow and nose crash,
-        but it won't hang.
+        If the test fails, it at least won't hang.
         """
 
         class A:
-
             def __getitem__(self, key):
                 return 3  # obviously simplified
 
         df = DataFrame([A()])
-        repr(df)  # just don't dine
+        repr(df)  # just don't die
 
     def test_float_trim_zeros(self):
         vals = [2.08430917305e+10, 3.52205017305e+10, 2.30674817305e+10,
@@ -2508,7 +2506,7 @@ def test_no_tz(self):
         assert str(ts_nanos_micros) == "1970-01-01 00:00:00.000001200"
 
     def test_tz_pytz(self):
-        tm._skip_if_no_pytz()
+        pytest.importorskip("pytz")
 
         import pytz
 
@@ -2522,8 +2520,7 @@ def test_tz_pytz(self):
         assert str(dt_datetime_us) == str(Timestamp(dt_datetime_us))
 
     def test_tz_dateutil(self):
-        tm._skip_if_no_dateutil()
-        import dateutil
+        dateutil = pytest.importorskip("dateutil")
         utc = dateutil.tz.tzutc()
 
         dt_date = datetime(2013, 1, 2, tzinfo=utc)

pandas/tests/io/json/test_ujson.py

@@ -396,18 +396,16 @@ def test_encodeTimeConversion(self):
             assert expected == output
 
     def test_encodeTimeConversion_pytz(self):
-        # GH11473 to_json segfaults with timezone-aware datetimes
-        tm._skip_if_no_pytz()
-        import pytz
+        # see gh-11473: to_json segfaults with timezone-aware datetimes
+        pytz = pytest.importorskip("pytz")
         test = datetime.time(10, 12, 15, 343243, pytz.utc)
         output = ujson.encode(test)
         expected = '"%s"' % test.isoformat()
         assert expected == output
 
     def test_encodeTimeConversion_dateutil(self):
-        # GH11473 to_json segfaults with timezone-aware datetimes
-        tm._skip_if_no_dateutil()
-        import dateutil
+        # see gh-11473: to_json segfaults with timezone-aware datetimes
+        dateutil = pytest.importorskip("dateutil")
         test = datetime.time(10, 12, 15, 343243, dateutil.tz.tzutc())
         output = ujson.encode(test)
         expected = '"%s"' % test.isoformat()

pandas/tests/io/test_pytables.py

@@ -5243,7 +5243,7 @@ def _compare_with_tz(self, a, b):
     def test_append_with_timezones_dateutil(self):
 
         from datetime import timedelta
-        tm._skip_if_no_dateutil()
+        pytest.importorskip("dateutil")
 
         # use maybe_get_tz instead of dateutil.tz.gettz to handle the windows
         # filename issues.

pandas/tests/plotting/common.py

@@ -23,7 +23,7 @@
 This is a common base class used for various plotting tests
 """
 
-tm._skip_module_if_no_mpl()
+tm._skip_if_no_mpl()
 
 
 def _skip_if_no_scipy_gaussian_kde():

pandas/tests/plotting/test_boxplot_method.py

@@ -21,7 +21,7 @@
 
 """ Test cases for .boxplot method """
 
-tm._skip_module_if_no_mpl()
+tm._skip_if_no_mpl()
 
 
 def _skip_if_mpl_14_or_dev_boxplot():

pandas/tests/plotting/test_datetimelike.py

@@ -20,7 +20,7 @@
 from pandas.tests.plotting.common import (TestPlotBase,
                                           _skip_if_no_scipy_gaussian_kde)
 
-tm._skip_module_if_no_mpl()
+tm._skip_if_no_mpl()
 
 
 class TestTSPlot(TestPlotBase):

pandas/tests/plotting/test_deprecated.py

@@ -18,7 +18,7 @@
 pandas.tools.plotting
 """
 
-tm._skip_module_if_no_mpl()
+tm._skip_if_no_mpl()
 
 
 class TestDeprecatedNameSpace(TestPlotBase):

pandas/tests/plotting/test_frame.py

@@ -27,7 +27,7 @@
                                           _skip_if_no_scipy_gaussian_kde,
                                           _ok_for_gaussian_kde)
 
-tm._skip_module_if_no_mpl()
+tm._skip_if_no_mpl()
 
 
 class TestDataFramePlots(TestPlotBase):

pandas/tests/plotting/test_groupby.py

@@ -10,7 +10,7 @@
 
 from pandas.tests.plotting.common import TestPlotBase
 
-tm._skip_module_if_no_mpl()
+tm._skip_if_no_mpl()
 
 
 class TestDataFrameGroupByPlots(TestPlotBase):

pandas/tests/plotting/test_hist_method.py

@@ -15,7 +15,7 @@
 from pandas.tests.plotting.common import (TestPlotBase, _check_plot_works)
 
 
-tm._skip_module_if_no_mpl()
+tm._skip_if_no_mpl()
 
 
 class TestSeriesPlots(TestPlotBase):

pandas/tests/plotting/test_misc.py

@@ -17,7 +17,7 @@
 from pandas.tests.plotting.common import (TestPlotBase, _check_plot_works,
                                           _ok_for_gaussian_kde)
 
-tm._skip_module_if_no_mpl()
+tm._skip_if_no_mpl()
 
 
 class TestSeriesPlots(TestPlotBase):

pandas/tests/plotting/test_series.py

@@ -22,7 +22,7 @@
                                           _skip_if_no_scipy_gaussian_kde,
                                           _ok_for_gaussian_kde)
 
-tm._skip_module_if_no_mpl()
+tm._skip_if_no_mpl()
 
 
 class TestSeriesPlots(TestPlotBase):