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.sizeprint “my ball is”,myball.colorprint “my ball’s direction is”,myball.directionprint “now i’m going to bounce the ball”printmyball.bounce()print “now the ball’s direction is”,myball.direction
运行会报错：
======================= restart: h:\python\bounce1.py =======================traceback (most recent call last): file “h:\python\bounce1.py”, line 11, in myball=ball(“red”,”small”,”down”)typeerror: this constructor takes no arguments
出错原因是，在python中构造函数书写格式是__init__，而不是_init_，即在init两侧都是双下划线，不是单下划线。
修改后如下：
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.sizeprint “my ball is”,myball.colorprint “my ball’s direction is”,myball.directionprint “now i’m going to bounce the ball”printmyball.bounce()print “now the ball’s direction is”,myball.direction
这是正确的运行结果：
======================= restart: h:\python\bounce1.py =======================i just created a ball.my ball is smallmy ball is redmy ball’s direction is downnow i’m going to bounce the ballnow the ball’s direction is up
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