Question

class Test(object):

    def __init__(self, name):
        self.name = name

    def new(self):
        name = str(input('Name: '))
        reg = Test(nombre)
        return reg

person = new()

为什么这段代码会抛出“NameError：name'new'未定义”？

Answer 1

我假设您正在尝试构建Test类的新实例，并使用用户提供的名称加载它。

首先，您需要更正缩进。

其次，对于非类函数，您不需要self参数。

class Test(object):
    def __init__(self, name):
        self.name = name

def new():
    name = str(raw_input('Name: '))
    return Test(name)

person = new()

请注意，更多Pythonic方式可能是将逻辑放入构造函数本身，就像这样。

class Test(object):
    def __init__(self, name=None):
        if name is None:
           name = raw_input('Name: ')
        self.name = name

person = Test()

Answer 2

class Test(object):
    def __init__(self, name):
        self.name = name
    @staticmethod
    def new():
        name = str(input('Name: '))
        reg = Test(nombre)
        return reg

person = Test.new() #ok since new is attached to a class namespace
person = new() # raises name error since new is part of Test, not the global namespace

或许也许

class Test(object):
    def __init__(self, name):
        self.name = name

def new():
    name = str(input('Name: '))
    reg = Test(nombre)
    return reg 

person = new() #ok since new is in the global namespace

python中的NameError实例类

2 个答案: