Question

我在创建类实例时尝试通过函数分配变量，但是它不起作用。

class Test:
    def __init__(self, l):
        self.l = l
        self.func(self.l) # or I tried self.func(l)
        self.z = None
        self.y = None

    def func(self, l):
        self.z = l  # doesn't work
        self.y = 123 # doesn't work

x = Test('test')
print(x.z) # = None
print(x.y) # = None

有人可以解释一下吗，欢迎链接！

Answer 1

用%macro run_query(count); %do i=1 %to &count; // random logic proc sql; select count(*) from random_tbl where some_filtering_condition="&i"; quit; %end; %mend create; %run_query(10)定义self.z和self.y后，您将None重新定义为func。摆脱self.z

中的self.y和__init__

class Test:

    def __init__(self, l):
        self.l = l
        self.func(self.l) # or I tried self.func(l)
        # These are redefining the variables, comment out
        # self.z = None
        # self.y = None

    def func(self, l):
        self.z = l  
        self.y = 123

Answer 2

为此，您只想让您的=GOOGLEFINANCE()不需要传递，因为我们的函数可以从func(self)调用self.l，也不需要__init__，那么我们可以只需调用self.func(self.l)即可使用func，然后它将更改x.func和x.x

的值

x.y

Answer 3

Python依赖于制表符/空格缩进，这应该可行。

class Test:
    def __init__(self, l):
        self.l = l
        self.func(self.l)  # or I tried self.func(l)
        self.z = None
        self.y = None

    def func(self, l):
        self.z = l  # doesn't work
        self.y = 123  # doesn't work


x = Test('test')
print(x.z)  # = None
print(x.y)  # = None

Python无法分配对象变量

3 个答案: