有什么办法可以避免打电话__init__
在初始化类时,例如从类方法中?
我正在尝试在 Python 中创建一个不区分大小写和标点符号的字符串类,用于有效比较的目的,但在不调用的情况下创建新实例时遇到问题__init__
.
>>> class String:
def __init__(self, string):
self.__string = tuple(string.split())
self.__simple = tuple(self.__simple())
def __simple(self):
letter = lambda s: ''.join(filter(lambda s: 'a' <= s <= 'z', s))
return filter(bool, map(letter, map(str.lower, self.__string)))
def __eq__(self, other):
assert isinstance(other, String)
return self.__simple == other.__simple
def __getitem__(self, key):
assert isinstance(key, slice)
string = String()
string.__string = self.__string[key]
string.__simple = self.__simple[key]
return string
def __iter__(self):
return iter(self.__string)
>>> String('Hello, world!')[1:]
Traceback (most recent call last):
File "<pyshell#2>", line 1, in <module>
String('Hello, world!')[1:]
File "<pyshell#1>", line 17, in __getitem__
string = String()
TypeError: __init__() takes exactly 2 positional arguments (1 given)
>>>
我应该更换什么string = String(); string.__string = self.__string[key]; string.__simple = self.__simple[key]
用切片初始化新对象?
EDIT:
受到下面写的答案的启发,初始化程序已被编辑以快速检查是否没有参数。
def __init__(self, string=None):
if string is None:
self.__string = self.__simple = ()
else:
self.__string = tuple(string.split())
self.__simple = tuple(self.__simple())