Python类不使用def __init __(self) [英] Python Classes without using def __init__(self)
问题描述
我正在写一系列文本菜单。下面的类和子类运行没有问题。但我正在检查我的编码,我想知道....是否确定,我没有使用 def __init __(self)
在类中?我应该把数据成员放在 def __init __(Self):
如self.images =(),self.options =()?
I am writing a series of text menus. With the class and sub class below it runs with no issues. But I am reviewing my coding and I am wondering....is it ok that I didn't use def __init__(self)
in the classes? Should I have placed the data members in def __init__(Self):
such as self.images = (), self.options =()? If I did that then I could not use the abc module for restrains, correct?
class BaseMenu(object):
__metaclass__ = abc.ABCMeta
@abc.abstractproperty
def options(self):
pass
@abc.abstractproperty
def menu_name(self):
pass
def display(self):
header = "FooBar YO"
term = getTerminalSize()
#sys.stdout.write("\x1b[2J\x1b[H")
print header.center(term, '*')
print self.menu_name.center(term, '+')
print "Please choose which option:"
for i in self.options:
print(
str(self.options.index(i)+1) + ") "
+ i.__name__
)
value = int(raw_input("Please Choose: ")) - 1
self.options[value](self)
class Servers(BaseMenu):
menu_name = "Servers"
images = ()
foo = ()
def get_images(self):
if not self.images:
self.images = list_images.get_images()
for img in self.images:
print (
str(self.images.index(img)+1) + ") "
+ "Name: %s\n ID: %s" %
(img.name, img.id)
)
def get_foo(self):
if not self.foo:
self.foo = list_list.get_list()
for list in self.foo:
print "Name:", list.name
print " ID:", list.id
print
def create_servers(self):
create_server.create(self)
options = (
get_images,
get_foo,
create_servers
)
推荐答案
您的代码完全正常。您不必拥有 __ init __
方法。
Your code is perfectly fine. You don't have to have an __init__
method.
__ init __
,即使使用ABC。所有的ABC元测试是如果名称已经定义。在 __ init __
中设置图像需要定义类属性,但可以将其设置为
无
开始时:
You can still use __init__
, even with an ABC. All that the ABC meta tests for is if the names have been defined. Setting images
in an __init__
does requires that you define a class attribute, but you can set that to None
at first:
class Servers(BaseMenu):
menu_name = "Servers"
images = None
foo = None
def __init__(self):
self.images = list_images.get_images()
self.foo = list_list.get_list()
现在您可以在ABC上设置约束, 图像
抽象属性可用; images = None
class属性将满足该约束。
Now you can set constraints on the ABC requiring that a images
abstract property be available; the images = None
class attribute will satisfy that constraint.
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