Python 7.creating clss methods

1.inside the Car class ,add a method named display_car() to Car that will reference the car's member variable to return the string."This is a [color] [model] with [mpg] MPG."you can use the str() function to turn you mpg into a string when creating the display string.
2.replace the individual print statments with a single **print ** command that displays the result of calling my_car.display_car()

class Car(object):
condition ="new"
def init(self,model,color,mpg):
self.model =model
self.color =color
self.mpg =mpg
def display_car(self):
print "This is a %s %s with %s MPG." % (self.model,self.color,self.mpg)
my_car = Car("DeLorean","silver",88)
print my_car.display_car()

"与this之间没有空格，有空格就出错。
syntax:
(%s) % (self.variable)
中间有%,第一次因为无%而出错。