python访问子类中的超类变量
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python accessing super class variable in child class
提问by user1050619
I would like to access the value of self.x in the child class. How do I access it?
我想在子类中访问 self.x 的值。我如何访问它？
class ParentClass(object):
def __init__(self):
self.x = [1,2,3]
def test(self):
print 'Im in parent class'
class ChildClass(ParentClass):
def test(self):
super(ChildClass,self).test()
print "Value of x = ". self.x
x = ChildClass()
x.test()
回答by David Robinson
You accessed the super class variable correctly; your code gives you an error because of how you tried to print it. You used .for string concatenation instead of +, and concatenated a string and a list. Change the line
您正确访问了超类变量；由于您尝试打印它的方式，您的代码会给您一个错误。您用于.字符串连接而不是+, 并将字符串和列表连接起来。换线
print "Value of x = ". self.x
to any of the following:
以下任何一项：
print "Value of x = " + str(self.x)
print "Value of x =", self.x
print "Value of x = %s" % (self.x, )
print "Value of x = {0}".format(self.x)
回答by GLES
class Person(object):
def __init__(self):
self.name = "{} {}".format("First","Last")
class Employee(Person):
def introduce(self):
print("Hi! My name is {}".format(self.name))
e = Employee()
e.introduce()
Hi! My name is First Last
Hi! My name is First Last
