ENH: add bold_rows option to DataFrame.to_html, GH pandas-dev#586

Author: wesm

RELEASE.rst

@@ -52,7 +52,8 @@ pandas 0.7.0
   - Add attribute-based item access to ``Panel`` and add IPython completion (PR
     #554)
   - Add ``logy`` option to ``Series.plot`` for log-scaling on the Y axis
-  - Add ``index`` and ``header`` options to ``DataFrame.to_string`` (GH #570)
+  - Add ``index``, ``header``, and ``justify`` options to
+    ``DataFrame.to_string`` (GH #570, GH #571)
   - Can pass multiple DataFrames to ``DataFrame.join`` to join on index (GH #115)
   - Can pass multiple Panels to ``Panel.join`` (GH #115)
   - Can pass multiple DataFrames to `DataFrame.append` to concatenate (stack)
@@ -105,6 +106,7 @@ pandas 0.7.0
     DataFrame objects
   - Made ``Index._get_duplicates`` a public method by removing the underscore
   - Prettier printing of floats, and column spacing fix (GH #395, GH #571)
+  - Add ``bold_rows`` option to DataFrame.to_html (GH #586)
 
 **Bug fixes**
 

pandas/core/format.py

@@ -49,7 +49,7 @@ class DataFrameFormatter(object):
     def __init__(self, frame, buf=None, columns=None, col_space=None,
                  header=True, index=True, na_rep='NaN', formatters=None,
                  justify='left', float_format=None, sparsify=True,
-                 index_names=True):
+                 index_names=True, **kwds):
         self.frame = frame
         self.buf = buf if buf is not None else StringIO()
         self.show_index_names = index_names
@@ -62,6 +62,8 @@ def __init__(self, frame, buf=None, columns=None, col_space=None,
         self.index = index
         self.justify = justify
 
+        self.kwds = kwds
+
         if columns is not None:
             self.columns = _ensure_index(columns)
         else:
@@ -217,13 +219,22 @@ def _column_header():
 
             write(buf, '<tbody>', indent)
 
+            _bold_row = self.kwds.get('bold_rows', False)
+            def _maybe_bold_row(x):
+                temp = '<strong>%s</strong>'
+                if _bold_row:
+                    return ([temp % y for y in x] if isinstance(x, tuple)
+                            else temp % x)
+                else:
+                    return x
+
             # write values
             for i in range(len(frame)):
                 row = []
                 if isinstance(frame.index, MultiIndex):
-                    row.extend(frame.index[i])
+                    row.extend(_maybe_bold_row(frame.index[i]))
                 else:
-                    row.append(frame.index[i])
+                    row.append(_maybe_bold_row(frame.index[i]))
                 for column in frame.columns:
                     row.append(self._format_col(column, i))
                 write_tr(buf, row, indent, indent_delta)

pandas/core/frame.py

@@ -955,8 +955,13 @@ def to_string(self, buf=None, columns=None, col_space=None, colSpace=None,
     @Appender(docstring_to_string, indents=1)
     def to_html(self, buf=None, columns=None, col_space=None, colSpace=None,
                 header=True, index=True, na_rep='NaN', formatters=None,
-                float_format=None, sparsify=True, index_names=True):
+                float_format=None, sparsify=True, index_names=True,
+                bold_rows=True):
         """
+        to_html-specific options
+        bold_rows : boolean, default True
+            Make the row labels bold in the output
+
         Render a DataFrame to an html table.
         """
 
@@ -971,6 +976,7 @@ def to_html(self, buf=None, columns=None, col_space=None, colSpace=None,
                                        header=header, index=index,
                                        formatters=formatters,
                                        float_format=float_format,
+                                       bold_rows=bold_rows,
                                        sparsify=sparsify,
                                        index_names=index_names)
         formatter.to_html()

pandas/tests/test_frame.py

@@ -4151,4 +4151,3 @@ def test_stale_cached_series_bug_473(self):
     #                exit=False)
     nose.runmodule(argv=[__file__,'-vvs','-x','--pdb', '--pdb-failure'],
                    exit=False)
-