De-privatize functions in io.excel (#36104)

Author: jbrockmendel

pandas/io/excel/_base.py

@@ -24,11 +24,11 @@
     validate_header_arg,
 )
 from pandas.io.excel._util import (
-    _fill_mi_header,
-    _get_default_writer,
-    _maybe_convert_usecols,
-    _pop_header_name,
+    fill_mi_header,
+    get_default_writer,
     get_writer,
+    maybe_convert_usecols,
+    pop_header_name,
 )
 from pandas.io.parsers import TextParser
 
@@ -454,7 +454,7 @@ def parse(
                 sheet = self.get_sheet_by_index(asheetname)
 
             data = self.get_sheet_data(sheet, convert_float)
-            usecols = _maybe_convert_usecols(usecols)
+            usecols = maybe_convert_usecols(usecols)
 
             if not data:
                 output[asheetname] = DataFrame()
@@ -473,10 +473,10 @@ def parse(
                     if is_integer(skiprows):
                         row += skiprows
 
-                    data[row], control_row = _fill_mi_header(data[row], control_row)
+                    data[row], control_row = fill_mi_header(data[row], control_row)
 
                     if index_col is not None:
-                        header_name, _ = _pop_header_name(data[row], index_col)
+                        header_name, _ = pop_header_name(data[row], index_col)
                         header_names.append(header_name)
 
             if is_list_like(index_col):
@@ -645,7 +645,7 @@ def __new__(cls, path, engine=None, **kwargs):
                 try:
                     engine = config.get_option(f"io.excel.{ext}.writer")
                     if engine == "auto":
-                        engine = _get_default_writer(ext)
+                        engine = get_default_writer(ext)
                 except KeyError as err:
                     raise ValueError(f"No engine for filetype: '{ext}'") from err
             cls = get_writer(engine)

pandas/io/excel/_odswriter.py

@@ -5,7 +5,7 @@
 import pandas._libs.json as json
 
 from pandas.io.excel._base import ExcelWriter
-from pandas.io.excel._util import _validate_freeze_panes
+from pandas.io.excel._util import validate_freeze_panes
 from pandas.io.formats.excel import ExcelCell
 
 
@@ -59,7 +59,7 @@ def write_cells(
             wks = Table(name=sheet_name)
             self.sheets[sheet_name] = wks
 
-        if _validate_freeze_panes(freeze_panes):
+        if validate_freeze_panes(freeze_panes):
             assert freeze_panes is not None
             self._create_freeze_panes(sheet_name, freeze_panes)
 

pandas/io/excel/_openpyxl.py

@@ -6,7 +6,7 @@
 from pandas.compat._optional import import_optional_dependency
 
 from pandas.io.excel._base import ExcelWriter, _BaseExcelReader
-from pandas.io.excel._util import _validate_freeze_panes
+from pandas.io.excel._util import validate_freeze_panes
 
 if TYPE_CHECKING:
     from openpyxl.descriptors.serialisable import Serialisable
@@ -385,7 +385,7 @@ def write_cells(
             wks.title = sheet_name
             self.sheets[sheet_name] = wks
 
-        if _validate_freeze_panes(freeze_panes):
+        if validate_freeze_panes(freeze_panes):
             wks.freeze_panes = wks.cell(
                 row=freeze_panes[0] + 1, column=freeze_panes[1] + 1
             )

pandas/io/excel/_util.py

@@ -23,7 +23,7 @@ def register_writer(klass):
     _writers[engine_name] = klass
 
 
-def _get_default_writer(ext):
+def get_default_writer(ext):
     """
     Return the default writer for the given extension.
 
@@ -123,7 +123,7 @@ def _range2cols(areas: str) -> List[int]:
     return cols
 
 
-def _maybe_convert_usecols(usecols):
+def maybe_convert_usecols(usecols):
     """
     Convert `usecols` into a compatible format for parsing in `parsers.py`.
 
@@ -152,7 +152,7 @@ def _maybe_convert_usecols(usecols):
     return usecols
 
 
-def _validate_freeze_panes(freeze_panes):
+def validate_freeze_panes(freeze_panes):
     if freeze_panes is not None:
         if len(freeze_panes) == 2 and all(
             isinstance(item, int) for item in freeze_panes
@@ -169,15 +169,7 @@ def _validate_freeze_panes(freeze_panes):
     return False
 
 
-def _trim_excel_header(row):
-    # trim header row so auto-index inference works
-    # xlrd uses '' , openpyxl None
-    while len(row) > 0 and (row[0] == "" or row[0] is None):
-        row = row[1:]
-    return row
-
-
-def _fill_mi_header(row, control_row):
+def fill_mi_header(row, control_row):
     """
     Forward fill blank entries in row but only inside the same parent index.
 
@@ -210,7 +202,7 @@ def _fill_mi_header(row, control_row):
     return row, control_row
 
 
-def _pop_header_name(row, index_col):
+def pop_header_name(row, index_col):
     """
     Pop the header name for MultiIndex parsing.
 

pandas/io/excel/_xlsxwriter.py

@@ -3,7 +3,7 @@
 import pandas._libs.json as json
 
 from pandas.io.excel._base import ExcelWriter
-from pandas.io.excel._util import _validate_freeze_panes
+from pandas.io.excel._util import validate_freeze_panes
 
 
 class _XlsxStyler:
@@ -208,7 +208,7 @@ def write_cells(
 
         style_dict = {"null": None}
 
-        if _validate_freeze_panes(freeze_panes):
+        if validate_freeze_panes(freeze_panes):
             wks.freeze_panes(*(freeze_panes))
 
         for cell in cells:

pandas/io/excel/_xlwt.py

@@ -3,7 +3,7 @@
 import pandas._libs.json as json
 
 from pandas.io.excel._base import ExcelWriter
-from pandas.io.excel._util import _validate_freeze_panes
+from pandas.io.excel._util import validate_freeze_panes
 
 if TYPE_CHECKING:
     from xlwt import XFStyle
@@ -48,7 +48,7 @@ def write_cells(
             wks = self.book.add_sheet(sheet_name)
             self.sheets[sheet_name] = wks
 
-        if _validate_freeze_panes(freeze_panes):
+        if validate_freeze_panes(freeze_panes):
             wks.set_panes_frozen(True)
             wks.set_horz_split_pos(freeze_panes[0])
             wks.set_vert_split_pos(freeze_panes[1])