how to prevent 5ctextbackslash in latex from python

1In [13]: print df.to_latex(escape=False)
2# Result:  
3\begin{tabular}{lrr}
4\toprule
5{} &  $ \beta $ &  $ \gamma $ \\
6\midrule
70 &          1 &           2 \\
81 &          3 &           4 \\
9\bottomrule
10\end{tabular}