REF: io/formats/html.py (and io/formats/format.py) (#24637)

Author: simonjayhawkins

pandas/io/formats/format.py

@@ -778,7 +778,7 @@ def space_format(x, y):
                            for i, (col, x) in enumerate(zip(columns,
                                                             fmt_columns))]
 
-        if self.show_index_names and self.has_index_names:
+        if self.show_row_idx_names:
             for x in str_columns:
                 x.append('')
 
@@ -793,30 +793,41 @@ def has_index_names(self):
     def has_column_names(self):
         return _has_names(self.frame.columns)
 
+    @property
+    def show_row_idx_names(self):
+        return all((self.has_index_names,
+                    self.index,
+                    self.show_index_names))
+
+    @property
+    def show_col_idx_names(self):
+        return all((self.has_column_names,
+                    self.show_index_names,
+                    self.header))
+
     def _get_formatted_index(self, frame):
         # Note: this is only used by to_string() and to_latex(), not by
         # to_html().
         index = frame.index
         columns = frame.columns
-
-        show_index_names = self.show_index_names and self.has_index_names
-        show_col_names = (self.show_index_names and self.has_column_names)
-
         fmt = self._get_formatter('__index__')
 
         if isinstance(index, ABCMultiIndex):
-            fmt_index = index.format(sparsify=self.sparsify, adjoin=False,
-                                     names=show_index_names, formatter=fmt)
+            fmt_index = index.format(
+                sparsify=self.sparsify, adjoin=False,
+                names=self.show_row_idx_names, formatter=fmt)
         else:
-            fmt_index = [index.format(name=show_index_names, formatter=fmt)]
+            fmt_index = [index.format(
+                name=self.show_row_idx_names, formatter=fmt)]
+
         fmt_index = [tuple(_make_fixed_width(list(x), justify='left',
                                              minimum=(self.col_space or 0),
                                              adj=self.adj)) for x in fmt_index]
 
         adjoined = self.adj.adjoin(1, *fmt_index).split('\n')
 
         # empty space for columns
-        if show_col_names:
+        if self.show_col_idx_names:
             col_header = ['{x}'.format(x=x)
                           for x in self._get_column_name_list()]
         else:

pandas/io/formats/html.py

@@ -45,23 +45,11 @@ def __init__(self, formatter, classes=None, notebook=False, border=None,
 
     @property
     def show_row_idx_names(self):
-        return all((self.fmt.has_index_names,
-                    self.fmt.index,
-                    self.fmt.show_index_names))
+        return self.fmt.show_row_idx_names
 
     @property
     def show_col_idx_names(self):
-        # see gh-22579
-        # Column misalignment also occurs for
-        # a standard index when the columns index is named.
-        # Determine if ANY column names need to be displayed
-        # since if the row index is not displayed a column of
-        # blank cells need to be included before the DataFrame values.
-        # TODO: refactor to add show_col_idx_names property to
-        # DataFrameFormatter
-        return all((self.fmt.has_column_names,
-                    self.fmt.show_index_names,
-                    self.fmt.header))
+        return self.fmt.show_col_idx_names
 
     @property
     def row_levels(self):
@@ -184,14 +172,28 @@ def write_style(self):
         template = dedent('\n'.join((template_first,
                                      template_mid,
                                      template_last)))
-        if self.notebook:
-            self.write(template)
+        self.write(template)
 
     def write_result(self, buf):
-        indent = 0
-        id_section = ""
-        frame = self.frame
+        if self.notebook:
+            self.write('<div>')
+            self.write_style()
+
+        self._write_table()
+
+        if self.should_show_dimensions:
+            by = chr(215) if compat.PY3 else unichr(215)  # ×
+            self.write(u('<p>{rows} rows {by} {cols} columns</p>')
+                       .format(rows=len(self.frame),
+                               by=by,
+                               cols=len(self.frame.columns)))
 
+        if self.notebook:
+            self.write('</div>')
+
+        buffer_put_lines(buf, self.elements)
+
+    def _write_table(self, indent=0):
         _classes = ['dataframe']  # Default class.
         use_mathjax = get_option("display.html.use_mathjax")
         if not use_mathjax:
@@ -204,33 +206,21 @@ def write_result(self, buf):
                                      .format(typ=type(self.classes)))
             _classes.extend(self.classes)
 
-        if self.notebook:
-            self.write('<div>')
-
-        self.write_style()
-
-        if self.table_id is not None:
+        if self.table_id is None:
+            id_section = ""
+        else:
             id_section = ' id="{table_id}"'.format(table_id=self.table_id)
+
         self.write('<table border="{border}" class="{cls}"{id_section}>'
                    .format(border=self.border, cls=' '.join(_classes),
                            id_section=id_section), indent)
 
-        indent += self.indent_delta
-        indent = self._write_header(indent)
-        indent = self._write_body(indent)
+        if self.fmt.header or self.show_row_idx_names:
+            self._write_header(indent + self.indent_delta)
 
-        self.write('</table>', indent)
-        if self.should_show_dimensions:
-            by = chr(215) if compat.PY3 else unichr(215)  # ×
-            self.write(u('<p>{rows} rows {by} {cols} columns</p>')
-                       .format(rows=len(frame),
-                               by=by,
-                               cols=len(frame.columns)))
+        self._write_body(indent + self.indent_delta)
 
-        if self.notebook:
-            self.write('</div>')
-
-        buffer_put_lines(buf, self.elements)
+        self.write('</table>', indent)
 
     def _write_col_header(self, indent):
         truncate_h = self.fmt.truncate_h
@@ -359,41 +349,29 @@ def _write_row_header(self, indent):
         self.write_tr(row, indent, self.indent_delta, header=True)
 
     def _write_header(self, indent):
-        if not (self.fmt.header or self.show_row_idx_names):
-            # write nothing
-            return indent
-
         self.write('<thead>', indent)
-        indent += self.indent_delta
 
         if self.fmt.header:
-            self._write_col_header(indent)
+            self._write_col_header(indent + self.indent_delta)
 
         if self.show_row_idx_names:
-            self._write_row_header(indent)
+            self._write_row_header(indent + self.indent_delta)
 
-        indent -= self.indent_delta
         self.write('</thead>', indent)
 
-        return indent
-
     def _write_body(self, indent):
         self.write('<tbody>', indent)
-        indent += self.indent_delta
-
         fmt_values = {i: self.fmt._format_col(i) for i in range(self.ncols)}
 
         # write values
         if self.fmt.index and isinstance(self.frame.index, ABCMultiIndex):
-            self._write_hierarchical_rows(fmt_values, indent)
+            self._write_hierarchical_rows(
+                fmt_values, indent + self.indent_delta)
         else:
-            self._write_regular_rows(fmt_values, indent)
+            self._write_regular_rows(
+                fmt_values, indent + self.indent_delta)
 
-        indent -= self.indent_delta
         self.write('</tbody>', indent)
-        indent -= self.indent_delta
-
-        return indent
 
     def _write_regular_rows(self, fmt_values, indent):
         truncate_h = self.fmt.truncate_h