python中typeerror_详解python中的TypeError错误解决办法

新手在学习python时候，会遇到很多的坑，下面来具体说说其中一个。

在使用python编写面向对象的程序时，新手可能遇到TypeError: this constructor takes no arguments这个错误。

例如下面的程序：

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 "I just created a ball."

print "My ball is",myBall.size

print "My ball is",myBall.color

print "My ball's direction is",myBall.direction

print "Now I'm going to bounce the ball"

print

myBall.bounce()

print "Now the ball's direction is",myBall.direction

运行会报错：

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