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ENH: update DataFrame to_latex for nicer typesetting #3264

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merged 1 commit into from
Apr 12, 2013
Merged

ENH: update DataFrame to_latex for nicer typesetting #3264

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17 changes: 12 additions & 5 deletions pandas/core/format.py
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Original file line number Diff line number Diff line change
Expand Up @@ -347,6 +347,12 @@ def to_latex(self, force_unicode=None, column_format=None):
"""
Render a DataFrame to a LaTeX tabular environment output.
"""
def get_col_type(dtype):
if issubclass(dtype.type, np.number):
return 'r'
else:
return 'l'

import warnings
if force_unicode is not None: # pragma: no cover
warnings.warn(
Expand All @@ -362,27 +368,28 @@ def to_latex(self, force_unicode=None, column_format=None):
strcols = [[info_line]]
else:
strcols = self._to_str_columns()

if column_format is None:
column_format = '|l|%s|' % '|'.join('c' for _ in strcols)
dtypes = self.frame.dtypes.values
column_format = 'l%s' % ''.join(map(get_col_type, dtypes))
elif not isinstance(column_format, basestring):
raise AssertionError(('column_format must be str or unicode, not %s'
% type(column_format)))

self.buf.write('\\begin{tabular}{%s}\n' % column_format)
self.buf.write('\\hline\n')
self.buf.write('\\toprule\n')

nlevels = frame.index.nlevels
for i, row in enumerate(izip(*strcols)):
if i == nlevels:
self.buf.write('\\hline\n') # End of header
self.buf.write('\\midrule\n') # End of header
crow = [(x.replace('_', '\\_')
.replace('%', '\\%')
.replace('&', '\\&') if x else '{}') for x in row]
self.buf.write(' & '.join(crow))
self.buf.write(' \\\\\n')

self.buf.write('\\hline\n')
self.buf.write('\\bottomrule\n')
self.buf.write('\\end{tabular}\n')

def _format_col(self, i):
Expand Down