Question

python类与函数的用法，下面程序错在哪？

class Ball:
def _init(self,color,size,direction):
self.color=color
self.size=size
self.direction=direction
def bounce(self):
if self.direction=='down':
self.direction='up'

myBall=Ball("red","small","down")
print ' set a ball'
print 'ball color=',myball.color
print 'ball size=',myball.size
print 'ball diretion=',myball.direction
myball.bounce()
print 'ball direction=',myball.direction

Traceback (most recent call last):
File "D:/Program Files/python/123python/0725/003", line 10, in <module>
myBall=Ball("red","small","down")
TypeError: this constructor takes no arguments

Answer 1

#细节问题一堆
#def _init   ——————》def __init__   ，左右双下划线
#所有不是myBall的要改为myBall,python区分大小写，一共有五处错误

追问

还是错啊

Answer 2

TypeError 意思就是你的类型搞错了

Answer 3

是__init__，不是_init