sympy_parser.py 文件源码

def evaluateFalse(s):
    """
    Replaces operators with the SymPy equivalent and sets evaluate=False.
    """
    node = ast.parse(s)
    node = EvaluateFalseTransformer().visit(node)
    # node is a Module, we want an Expression
    node = ast.Expression(node.body[0].value)

    return ast.fix_missing_locations(node)