Python中小错误 之 object() takes no parameters

 class Person :
    population=0
    def __init__(self,name):
        self.name=name
        print ('Initializing %s'  % self.name)
        Person.population+=1
    def sayHi(self):
        print ('hi，My name is %s.' % self.name)

    def howMany(self):
        if Person.population==1:
            print ('I am the current population .')
        else:
            print ('We have  %d persons here ' % Person.population)


swaroop=Person('Swaroop')
swaroop.sayHi()
swaroop.howMany()

kalam=Person('Abdul kalam')
kalam.sayHi()
kalam.howMany()

swaroop.sayHi()
swaroop.howMany()

如上面python代码，是学习python类时遇到的一个小例子。但是在运行时会报错：

Traceback (most recent call last):
  File "E:/PythonStudy/objvar.py", line 18, in
    swaroop=Person('Swaroop')
TypeError: object() takes no parameters

经过查阅资料才知道，是构造函数里的下划线的问题，

__init__(self,name)这个构造函数的左右下划线都是两个，我只用了一个，导致错误。