TST: Fix excel test discovery (#16478)

* TST: Fix excel test discovery

* BUG: Handle sheetname deprecation directly

Since sheetname=None has a special meaning, we can't use the deprecate_kwargs
decorator. We instead handle it in read_excel.

* TST/BUG: Ensure pathlib roundtrip uses right params

Reader / writer may depend on filename and engine. Set these on
the reader and writer before round-tripping.

pandas/io/excel.py

@@ -8,6 +8,7 @@
 
 import os
 import abc
+import warnings
 import numpy as np
 
 from pandas.core.dtypes.common import (
@@ -30,7 +31,7 @@
 import pandas.compat.openpyxl_compat as openpyxl_compat
 from warnings import warn
 from distutils.version import LooseVersion
-from pandas.util._decorators import Appender, deprecate_kwarg
+from pandas.util._decorators import Appender
 from textwrap import fill
 
 __all__ = ["read_excel", "ExcelWriter", "ExcelFile"]
@@ -193,7 +194,6 @@ def get_writer(engine_name):
         raise ValueError("No Excel writer '%s'" % engine_name)
 
 
-@deprecate_kwarg('sheetname', 'sheet_name')
 @Appender(_read_excel_doc)
 def read_excel(io, sheet_name=0, header=0, skiprows=None, skip_footer=0,
                index_col=None, names=None, parse_cols=None, parse_dates=False,
@@ -202,6 +202,15 @@ def read_excel(io, sheet_name=0, header=0, skiprows=None, skip_footer=0,
                dtype=None, true_values=None, false_values=None, engine=None,
                squeeze=False, **kwds):
 
+    # Can't use _deprecate_kwarg since sheetname=None has a special meaning
+    if is_integer(sheet_name) and sheet_name == 0 and 'sheetname' in kwds:
+        warnings.warn("The `sheetname` keyword is deprecated, use "
+                      "`sheet_name` instead", FutureWarning, stacklevel=2)
+        sheet_name = kwds.pop("sheetname")
+    elif 'sheetname' in kwds:
+        raise TypeError("Cannot specify both `sheet_name` and `sheetname`. "
+                        "Use just `sheet_name`")
+
     if not isinstance(io, ExcelFile):
         io = ExcelFile(io, engine=engine)
 

pandas/tests/io/test_excel.py

@@ -5,6 +5,7 @@
 import sys
 import os
 from distutils.version import LooseVersion
+from functools import partial
 
 import warnings
 from warnings import catch_warnings
@@ -407,7 +408,7 @@ def test_reading_all_sheets(self):
         # Ensure a dict is returned.
         # See PR #9450
         basename = 'test_multisheet'
-        dfs = self.get_exceldf(basename, sheetname=None)
+        dfs = self.get_exceldf(basename, sheet_name=None)
         # ensure this is not alphabetical to test order preservation
         expected_keys = ['Charlie', 'Alpha', 'Beta']
         tm.assert_contains_all(expected_keys, dfs.keys())
@@ -424,7 +425,7 @@ def test_reading_multiple_specific_sheets(self):
         basename = 'test_multisheet'
         # Explicitly request duplicates. Only the set should be returned.
         expected_keys = [2, 'Charlie', 'Charlie']
-        dfs = self.get_exceldf(basename, sheetname=expected_keys)
+        dfs = self.get_exceldf(basename, sheet_name=expected_keys)
         expected_keys = list(set(expected_keys))
         tm.assert_contains_all(expected_keys, dfs.keys())
         assert len(expected_keys) == len(dfs.keys())
@@ -434,7 +435,7 @@ def test_reading_all_sheets_with_blank(self):
         # In the case where some sheets are blank.
         # Issue #11711
         basename = 'blank_with_header'
-        dfs = self.get_exceldf(basename, sheetname=None)
+        dfs = self.get_exceldf(basename, sheet_name=None)
         expected_keys = ['Sheet1', 'Sheet2', 'Sheet3']
         tm.assert_contains_all(expected_keys, dfs.keys())
 
@@ -551,11 +552,15 @@ def test_sheet_name_and_sheetname(self):
         dfref = self.get_csv_refdf('test1')
         df1 = self.get_exceldf('test1', sheet_name='Sheet1')    # doc
         with tm.assert_produces_warning(FutureWarning, check_stacklevel=False):
-            df2 = self.get_exceldf('test1', sheetname='Sheet2')  # bkwrd compat
+            df2 = self.get_exceldf('test1', sheetname='Sheet1')  # bkwrd compat
 
         tm.assert_frame_equal(df1, dfref, check_names=False)
         tm.assert_frame_equal(df2, dfref, check_names=False)
 
+    def test_sheet_name_both_raises(self):
+        with tm.assert_raises_regex(TypeError, "Cannot specify both"):
+            self.get_exceldf('test1', sheetname='Sheet1', sheet_name='Sheet1')
+
 
 class XlrdTests(ReadingTestsBase):
     """
@@ -589,7 +594,7 @@ def test_read_xlrd_Book(self):
                 result = read_excel(xl, "SheetA")
                 tm.assert_frame_equal(df, result)
 
-            result = read_excel(book, sheetname="SheetA", engine="xlrd")
+            result = read_excel(book, sheet_name="SheetA", engine="xlrd")
             tm.assert_frame_equal(df, result)
 
     @tm.network
@@ -691,7 +696,7 @@ def tdf(sheetname):
             with ExcelWriter(pth) as ew:
                 for sheetname, df in iteritems(dfs):
                     df.to_excel(ew, sheetname)
-            dfs_returned = read_excel(pth, sheetname=sheets)
+            dfs_returned = read_excel(pth, sheet_name=sheets)
             for s in sheets:
                 tm.assert_frame_equal(dfs[s], dfs_returned[s])
 
@@ -1001,19 +1006,19 @@ def test_read_excel_squeeze(self):
         tm.assert_series_equal(actual, expected)
 
 
-class XlsReaderTests(XlrdTests):
+class TestXlsReaderTests(XlrdTests):
     ext = '.xls'
     engine_name = 'xlrd'
     check_skip = staticmethod(_skip_if_no_xlrd)
 
 
-class XlsxReaderTests(XlrdTests):
+class TestXlsxReaderTests(XlrdTests):
     ext = '.xlsx'
     engine_name = 'xlrd'
     check_skip = staticmethod(_skip_if_no_xlrd)
 
 
-class XlsmReaderTests(XlrdTests):
+class TestXlsmReaderTests(XlrdTests):
     ext = '.xlsm'
     engine_name = 'xlrd'
     check_skip = staticmethod(_skip_if_no_xlrd)
@@ -1872,12 +1877,18 @@ def test_freeze_panes(self):
 
     def test_path_pathlib(self):
         df = tm.makeDataFrame()
-        result = tm.round_trip_pathlib(df.to_excel, pd.read_excel)
+        writer = partial(df.to_excel, engine=self.engine_name)
+        reader = partial(pd.read_excel)
+        result = tm.round_trip_pathlib(writer, reader,
+                                       path="foo.{}".format(self.ext))
         tm.assert_frame_equal(df, result)
 
     def test_path_localpath(self):
         df = tm.makeDataFrame()
-        result = tm.round_trip_localpath(df.to_excel, pd.read_excel)
+        writer = partial(df.to_excel, engine=self.engine_name)
+        reader = partial(pd.read_excel)
+        result = tm.round_trip_pathlib(writer, reader,
+                                       path="foo.{}".format(self.ext))
         tm.assert_frame_equal(df, result)
 
 
@@ -1909,7 +1920,7 @@ def versioned_raise_on_incompat_version(cls):
 
 
 @raise_on_incompat_version(1)
-class OpenpyxlTests(ExcelWriterBase):
+class TestOpenpyxlTests(ExcelWriterBase):
     ext = '.xlsx'
     engine_name = 'openpyxl1'
     check_skip = staticmethod(lambda *args, **kwargs: None)
@@ -1962,7 +1973,7 @@ def setup_class(cls):
 
 @raise_on_incompat_version(2)
 @skip_openpyxl_gt21
-class Openpyxl20Tests(ExcelWriterBase):
+class TestOpenpyxl20Tests(ExcelWriterBase):
     ext = '.xlsx'
     engine_name = 'openpyxl20'
     check_skip = staticmethod(lambda *args, **kwargs: None)
@@ -2078,7 +2089,7 @@ def setup_class(cls):
 
 @raise_on_incompat_version(2)
 @skip_openpyxl_lt22
-class Openpyxl22Tests(ExcelWriterBase):
+class TestOpenpyxl22Tests(ExcelWriterBase):
     ext = '.xlsx'
     engine_name = 'openpyxl22'
     check_skip = staticmethod(lambda *args, **kwargs: None)
@@ -2173,7 +2184,7 @@ def test_write_cells_merge_styled(self):
             assert xcell_a2.font == openpyxl_sty_merged
 
 
-class XlwtTests(ExcelWriterBase):
+class TestXlwtTests(ExcelWriterBase):
     ext = '.xls'
     engine_name = 'xlwt'
     check_skip = staticmethod(_skip_if_no_xlwt)
@@ -2230,7 +2241,7 @@ def test_to_excel_styleconverter(self):
         assert xlwt.Alignment.VERT_TOP == xls_style.alignment.vert
 
 
-class XlsxWriterTests(ExcelWriterBase):
+class TestXlsxWriterTests(ExcelWriterBase):
     ext = '.xlsx'
     engine_name = 'xlsxwriter'
     check_skip = staticmethod(_skip_if_no_xlsxwriter)
@@ -2283,7 +2294,7 @@ def test_column_format(self):
             assert read_num_format == num_format
 
 
-class OpenpyxlTests_NoMerge(ExcelWriterBase):
+class TestOpenpyxlTests_NoMerge(ExcelWriterBase):
     ext = '.xlsx'
     engine_name = 'openpyxl'
     check_skip = staticmethod(_skip_if_no_openpyxl)
@@ -2292,7 +2303,7 @@ class OpenpyxlTests_NoMerge(ExcelWriterBase):
     merge_cells = False
 
 
-class XlwtTests_NoMerge(ExcelWriterBase):
+class TestXlwtTests_NoMerge(ExcelWriterBase):
     ext = '.xls'
     engine_name = 'xlwt'
     check_skip = staticmethod(_skip_if_no_xlwt)
@@ -2301,7 +2312,7 @@ class XlwtTests_NoMerge(ExcelWriterBase):
     merge_cells = False
 
 
-class XlsxWriterTests_NoMerge(ExcelWriterBase):
+class TestXlsxWriterTests_NoMerge(ExcelWriterBase):
     ext = '.xlsx'
     engine_name = 'xlsxwriter'
     check_skip = staticmethod(_skip_if_no_xlsxwriter)
@@ -2310,7 +2321,7 @@ class XlsxWriterTests_NoMerge(ExcelWriterBase):
     merge_cells = False
 
 
-class ExcelWriterEngineTests(object):
+class TestExcelWriterEngineTests(object):
 
     def test_ExcelWriter_dispatch(self):
         with tm.assert_raises_regex(ValueError, 'No engine'):