(expr, optimizations)
return expr
Postprocess an expression after common subexpression elimination to
    return the expression to canonical sympy form.

    Parameters
    ----------
    expr : sympy expression
        The target expression to transform.
    optimizations : list of (callable, callable) pairs, optional
        The (preprocessor, postprocessor) pairs.  The postprocessors will be
        applied in reversed order to undo the effects of the preprocessors
        correctly.

    Returns
    -------
    expr : sympy expression
        The transformed expression.
Postprocess an expression after common subexpression elimination to
    return the expression to canonical sympy form.
Postprocess an expression after common subexpression elimination to return the expression to canonical sympy form .
def postprocess_for_cse(expr, optimizations):
    """ Postprocess an expression after common subexpression elimination to
    return the expression to canonical sympy form.

    Parameters
    ----------
    expr : sympy expression
        The target expression to transform.
    optimizations : list of (callable, callable) pairs, optional
        The (preprocessor, postprocessor) pairs.  The postprocessors will be
        applied in reversed order to undo the effects of the preprocessors
        correctly.

    Returns
    -------
    expr : sympy expression
        The transformed expression.
    """
    if optimizations is None:
        optimizations = cse_optimizations
    for pre, post in reversed(optimizations):
        if post is not None:
            expr = post(expr)
    return expr
def postprocess_for_cse ( expr , optimizations ) : if optimizations is None : optimizations = cse_optimizations for pre , post in reversed ( optimizations ) : if post is not None : expr = post ( expr ) return expr