尝试以面向对象的方式传递类和函数中的变量列表

Question

I'm trying to pass variable list in Class and Function in object oriented manner but facing some error, I don't understand what wrong with it and I'm using PyDev in Eclipse

CODE

class Mydetails:
    __details = ''

    def __init__(self,details):     # constructor
        #self.__details['country'] = details['country']
        self.__details = details

    def set_element(self,details):
        self.__details = details

    def get_list(self,details):
        return self.__details

details = ['ABC','DEF','GHI','JKL']
pdetails = Mydetails()
pdetails.set_element(details)
print(pdetails.get_list())

OUTPUT

Traceback (most recent call last):
  File "C:\workspace\python\pythonapp\list.py", line 18, in <module>
    pdetails = Mydetails()
TypeError: __init__() missing 1 required positional argument: 'details'

Answer 1

in this line:

def __init__(self,details):  

you made the init function take a parameter ( details ), but here:

pdetails = Mydetails()  

you arent giving it a parameter! what you probably wanted to do there is:

pdetails = Mydetails(details)

on a side note your def get_list(self,details): function doesn't make sense, why are you passing it a parameter that doesn't get used?

Answer 2

I fixed my code ,It was error in function def get_list(self,details): changed to def get_details(self): because details parameter already copied in self so it not allow the same thats why throwing error, but below code is fixed and work fine with function calling and defined object also correct from previous code.

CODE

class Mydetails:
    __details = ''     #protected


    def __init__(self,details={}):  # constructor
        self.__details = details


    def set_details(self,details):        # function
        self.__details = details

    def get_details(self):
        return self.__details

    def toString(self):
        return 'Welcome {}'.format(self.__details)


new_details = ['xyz','klm','nop']
pdetails = Mydetails()
pdetails.set_details(new_details)
print(pdetails.get_details())

OUTPUT

['xyz', 'klm', 'nop']