(cls, tree)
Converts a tree to string without translations.

        Examples:
        >>> from sympy.abc import x, y, z
        >>> from sympy import Integral, sin
        >>> from sympy.plotting.experimental_lambdify import Lambdifier
        >>> str2tree = Lambdifier([x], x).str2tree
        >>> tree2str = Lambdifier([x], x).tree2str

        >>> tree2str(str2tree(str(x+y*sin(z)+1)))
        'x + y*sin(z) + 1'
Converts a tree to string without translations.
Converts a tree to string without translations .
def tree2str(cls, tree):
        """Converts a tree to string without translations.

        Examples:
        >>> from sympy.abc import x, y, z
        >>> from sympy import Integral, sin
        >>> from sympy.plotting.experimental_lambdify import Lambdifier
        >>> str2tree = Lambdifier([x], x).str2tree
        >>> tree2str = Lambdifier([x], x).tree2str

        >>> tree2str(str2tree(str(x+y*sin(z)+1)))
        'x + y*sin(z) + 1'
        """
        if isinstance(tree, str):
            return tree
        else:
            return ''.join(map(cls.tree2str, tree))
def tree2str ( cls , tree ) : if isinstance ( tree , str ) : return tree else : return '' . join ( map ( cls . tree2str , tree ) )