astTools.py 文件源码

def doUnaryOp(op, val):
    """Perform the given AST unary operation on the value"""
    top = type(op)
    if top == ast.Invert:
        return ~ val
    elif top == ast.Not:
        return not val
    elif top == ast.UAdd:
        return val
    elif top == ast.USub:
        return -val