我的方法在值的链接处返回一个地址

Question

这是一个不属于现场训练的练习，我不明白为什么当我想显示我的卫星类的能量方法的返回值时，我会在控制台上收到一个地址。

Zoe satellite speed = 40.0m / s.
<bound method Satellite.energie of <__ main __. Satellite object at 0x01A5E610 >>
Zoe satellite speed = 70.0m / s.
<bound method Satellite.energie of <__ main __. Satellite object at 0x01A5E610 >>

这是我的代码：

class Satellite (object):
"" "Satellite for instantiating objects simulating satellites
artificial launched into space, around the earth. "" "
def __init __ (self, name, mass = 100, speed = 0):
self.name = name
self.mass = mass
speed choke = speed
def impulse (self, force, duration):
"" "will vary the speed of the satellite." ""
speed self = speed self + (force * duration) / mass self
def energy (self):
"" "will refer to the program calling the kinetic energy value of the satellite" ""
return_val = self.mass * self.speed ** 2/2
return return_val
def display_speed (self):
"" "will display the name of the satellite and its current speed." ""
print ("satellite speed {0} = {1} m / s.". format (self.name, self.speed))

s1 = Satellite ('Zoe', mass = 250, speed = 10)
s1.pulse (500, 15)
s1.display_speed ()
print (s1.energy)
s1.pulse (500, 15)
s1.display_speed ()
print (s1.energy)

Answer 1

您的energy方法是错误的，它应该给出一个语法错误：

def energy (self):
"" "will refer to the program calling the kinetic energy value of the satellite" ""
return_val = self.mass * self.speed ** 2/2
return return_val

更不用说，您还需要调用energy方法：

s1.pulse (500, 15)
s1.display_speed ()
print(s1.energy())
s1.pulse (500, 15)
s1.display_speed ()
print(s1.energy())

您试图覆盖return语句并将其用作变量，这是错误的。在您的代码中还有其他错误类型/问题，但这一个似乎是主要问题。

Answer 2

您不是在调用函数Satellite.energy()，而是在尝试访问属性Satellite.energy-如果将其更改为print(s1.energy())，它应该会正确显示！

需要注意的是，你的一些代码在这里被格式化错误，所以它无法运行——这对我来说很有效：

class Satellite (object):
"" "Satellite for instantiating objects simulating satellites artificial launched into space, around the earth. "" "
def __init__ (self, name, mass = 100, speed = 0):
self.name = name
self.mass = mass
self.speed = speed
def impulse (self, force, duration):
"" "will vary the speed of the satellite." ""
return self.speed + (force * duration) / self.mass
def energy (self):
"" "will refer to the program calling the kinetic energy value of the satellite" ""
return self.mass * self.speed ** 2/2
def display_speed (self):
"" "will display the name of the satellite and its current speed." ""
print ("satellite speed {0} = {1} m / s.". format (self.name, self.speed))

s1 = Satellite ('Zoe', mass = 250, speed = 10)
s1.impulse (500, 15)
s1.display_speed ()
print (s1.energy())
s1.impulse (500, 15)
s1.display_speed ()
print (s1.energy())