Python类继承函数并从子类传递参数
尝试从主菜单->服务器子菜单开始创建一系列文本菜单。当Servers()从BaseClass继承display()时,如何使继承的函数display()接收Servers()类中包含的选项元组和sub_menu=“Server menu”字符串?您可以在Python类继承函数并从子类传递参数,python,class,inheritance,Python,Class,Inheritance,尝试从主菜单->服务器子菜单开始创建一系列文本菜单。当Servers()从BaseClass继承display()时,如何使继承的函数display()接收Servers()类中包含的选项元组和sub_menu=“Server menu”字符串?您可以在display函数中使用self.options和self.sub_menu,但是为什么您在基本菜单类中引用它们,而该类对选项或子菜单一无所知 第二个问题是,您正在将“server”参数传递给一个类,该类的\uuu init\uuu不接受任何参数
display
函数中使用self.options
和self.sub_menu
,但是为什么您在基本菜单
类中引用它们,而该类对选项
或子菜单
一无所知
第二个问题是,您正在将“server”
参数传递给一个类,该类的\uuu init\uuu
不接受任何参数,因此您需要添加该参数
如果您打算从不实例化BaseMenu
对象,那么它就是一个抽象基类(或ABC)。您可以使用pythonsabc
module来定义它,以确保继承类定义了您期望的属性:
class BaseMenu(object):
def display(self):
header = "FooBar YO"
term = getTerminalSize()
#sys.stdout.write("\x1b[2J\x1b[H")
print header.center(term, '*')
#print sub_menu.center(term, '+')
print "Please choose which option:"
for i in options:
print(
str(options.index(i)+1) + ") "
)
class Servers(BaseMenu):
def __init__(self):
#super(Servers, self).__init__("server")
pass
def list_foo(self):
pass
def list_bar(self):
pass
options = (
list_foo,
list_bar
)
如果任何类在没有定义选项
和子菜单
的情况下尝试从基本菜单继承,则实例化时将导致类型错误
,如下所示:
import abc
class BaseMenu(object):
__metaclass__ = abc.ABCMeta #indicate that this is an ABC
@abc.abstractproperty # prevent derived classes that don't have options
def options(self):
pass
@abc.abstractproperty
def sub_menu(self):
pass
def __init__(self, menu_name): # takes the menu name as an argument ("server")
self.menu_name = menu_name
def display(self):
header = "FooBar YO"
term = getTerminalSize()
print header.center(term, '*')
print self.sub_menu.center(term, '+') # NOTE self.sub_menu
print "Please choose which option:"
for i in self.options: # NOTE self.options
print(self.options.index(i)+1 + ") ")
我不确定我是否完全明白你的要求,所以告诉我,这个怎么样
TypeError: Can't instantiate abstract class Servers with abstract methods options
实例化服务器
类,如下所示:
class BaseMenu(object):
# Added some attributes here:
menuName = ""
options = ()
def __init__(self, menu_name, opt):
self.menuName = menu_name # = "Servers Menu" when instantiated as Server
self.options = opt # the passed when instantiated as Server
def display(self):
# Use self.menuName and self.options here
#...
for i in self.options:
print(
str(self.options.index(i)+1) + ") " + str(i)
)
class Servers(BaseMenu):
def list_foo(self):
pass
def list_bar(self):
pass
options = (
list_foo,
list_bar
)
def __init__(self, menu_name):
super(Servers, self).__init__(menu_name, self.options)
产出:
servers = Servers("Servers Menu")
servers.display()
1)
2)
它合适吗?ncurses对这类事情很有帮助,不是吗?
1) <function list_foo at 0x29e06e0>
2) <function list_bar at 0x29e0758>