BUG: remove midrule in latex output with header=False

Author: loicseguin

doc/source/whatsnew/v0.17.1.txt

@@ -44,4 +44,29 @@ Bug Fixes
 ~~~~~~~~~
 
 - Bug in ``.to_latex()`` output broken when the index has a name (:issue: `10660`)
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 - Bug in ``squeeze()`` with zero length arrays (:issue:`11230`, :issue:`8999`)
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+- Bug in ``DataFrame.to_latex()`` produces an extra rule when ``header=False`` (:issue:`7124`)

pandas/core/format.py

@@ -672,7 +672,7 @@ def write(buf, frame, column_format, strcols, longtable=False):
             if any(frame.index.names):
                 nlevels += 1
             for i, row in enumerate(zip(*strcols)):
-                if i == nlevels:
+                if i == nlevels and self.header:
                     buf.write('\\midrule\n')  # End of header
                     if longtable:
                         buf.write('\\endhead\n')

pandas/tests/test_format.py

@@ -2793,6 +2793,30 @@ def test_to_latex_escape_special_chars(self):
 """
         self.assertEqual(observed, expected)
 
+    def test_to_latex_no_header(self):
+        # GH 7124
+        df = DataFrame({'a': [1, 2],
+                        'b': ['b1', 'b2']})
+        withindex_result = df.to_latex(header=False)
+        withindex_expected = r"""\begin{tabular}{lrl}
+\toprule
+0 &  1 &  b1 \\
+1 &  2 &  b2 \\
+\bottomrule
+\end{tabular}
+"""
+        self.assertEqual(withindex_result, withindex_expected)
+
+        withoutindex_result = df.to_latex(index=False, header=False)
+        withoutindex_expected = r"""\begin{tabular}{rl}
+\toprule
+ 1 &  b1 \\
+ 2 &  b2 \\
+\bottomrule
+\end{tabular}
+"""
+        self.assertEqual(withoutindex_result, withoutindex_expected)
+
     def test_to_csv_quotechar(self):
         df = DataFrame({'col' : [1,2]})
         expected = """\