Python 3.x 在Python 3.7.x中,如何将列表[customClass]用作@dataclass的类型
我有以下数据类Python 3.x 在Python 3.7.x中,如何将列表[customClass]用作@dataclass的类型,python-3.x,oop,python-dataclasses,Python 3.x,Oop,Python Dataclasses,我有以下数据类 @dataclass class Package: '''Class for keeping track of one destination.''' _address: [] @dataclass class Destination: '''Class for keeping track of a destination.''' _start: str _end: str _distance: float def __init__(self, param):
@dataclass
class Package:
'''Class for keeping track of one destination.'''
_address: []
@dataclass
class Destination:
'''Class for keeping track of a destination.'''
_start: str
_end: str
_distance: float
def __init__(self, param):
self._start = param[0]
self._end = param[1]
self._distance = param[2]
以及下面调用上述类的dataclass
@dataclass
class DestinationContainer:
'''Class for keeping track of a package destination.
and all the possible combinations of potential next destination '''
_package: Package
_destinations: List[Destination]
def __init__(self):
pass
def addPkg(self,param):
self._package = param
我在尝试运行程序时遇到以下错误
TypeError:泛型类型的参数必须是类型
我也尝试过用这种方式呼叫\u destinations
成员
_destinations: List[Destination] = field(default_factory=list)
然后我得到以下错误
TypeError:泛型类型的参数必须是类型
我还尝试将类成员设置为
_destinations: []
检查实例对象后,类中没有可用的列表
我也试过了
_destinations: List = field(default_factory=lambda: [])
当我尝试添加到列表时,出现以下错误
AttributeError:“DestinationContainer”对象没有属性“\u destinations”
正如Patrick在评论中所说,您的主要问题是在使用
@dataclass
时定义了自己的\uuuu init\uuu
函数。如果您删除它并稍微重新构造代码,它将按预期工作:
from dataclasses import dataclass
from typing import List
@dataclass
class Package:
_address: []
@dataclass
class Destination:
_start: str
_end: str
_distance: float
@dataclass
class DestinationContainer:
_package: Package
_destinations: List[Destination]
def addPkg(self, param):
# sure this shouldn't be "self._package.append(param)"?
self._package = param
# works
dc = DestinationContainer(
Package(['some address']),
[Destination('s', 'e', 1.0)]
)
# also works
dc.addPkg(Package(['some other address']))
目的地是如何定义的?该错误抱怨
List[Destination]
,因为它认为Destination
不是一种类型。此外,您根本不应该定义自己的\uuuuu init\uuuu
@dataclass
将为您创建一个。如果你需要做更多的事情,你应该使用。