some SyntaxWarnings when batch_build_graph #21

hello,brother!i found many repos print infos like when batch_build_graph:
/data2/123/9/sympy_sympy/examples/intermediate/mplot2d.py:23: SyntaxWarning: invalid escape sequence '\S'
warnings.filterwarnings("ignore", "Could not match \S")
/data2/123/9/sympy_sympy/examples/intermediate/vandermonde.py:121: SyntaxWarning: invalid escape sequence '\s'
print("Computing the determinant and comparing to \sum_{0<i<j<=3}(a_j - a_i)")
/data2/123/9/sympy_sympy/examples/intermediate/vandermonde.py:130: SyntaxWarning: invalid escape sequence '\s'
\sum = %(sum)s
/data2/123/9/sympy_sympy/examples/intermediate/sample.py:4: SyntaxWarning: invalid escape sequence '\m'
See examples\mplot2d.py and examples\mplot3d.py for usable 2d and 3d
/data2/123/9/sympy_sympy/examples/intermediate/sample.py:16: SyntaxWarning: invalid escape sequence '\m'
syntax. See examples\mplot2d.py.
/data2/123/9/sympy_sympy/examples/intermediate/sample.py:47: SyntaxWarning: invalid escape sequence '\m'
syntax. See examples\mplot3d.py.
/data2/123/9/sympy_sympy/examples/intermediate/mplot3d.py:22: SyntaxWarning: invalid escape sequence '\S'
warnings.filterwarnings("ignore", "Could not match \S")
:198: SyntaxWarning: invalid escape sequence '\w'
:252: SyntaxWarning: invalid escape sequence '*'

thank you very much!