相关疑难解决方法(0)

如果我上课了......

class MyClass:

    def method(arg):
        print(arg)

...我用来创建一个对象......

my_object = MyClass()

......我就这样打电话method("foo")......

>>> my_object.method("foo")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: method() takes exactly 1 positional argument (2 given)

...为什么Python告诉我我给了它两个参数,当我只给出一个？

我正在写一小段python作为家庭作业,我不会让它运行!我没有那么多的Python经验,但我知道很多Java.我正在尝试实现粒子群优化算法,这就是我所拥有的:

class Particle:    

    def __init__(self,domain,ID):
        self.ID = ID
        self.gbest = None
        self.velocity = []
        self.current = []
        self.pbest = []
        for x in range(len(domain)):
            self.current.append(random.randint(domain[x][0],domain[x][1])) 
            self.velocity.append(random.randint(domain[x][0],domain[x][1])) 
            self.pbestx = self.current          

    def updateVelocity():
    for x in range(0,len(self.velocity)):
        self.velocity[x] = 2*random.random()*(self.pbestx[x]-self.current[x]) + 2 * random.random()*(self.gbest[x]-self.current[x]) 


    def updatePosition():    
        for x in range(0,len(self.current)):
            self.current[x] = self.current[x] + self.velocity[x]    

    def updatePbest():
        if costf(self.current) < costf(self.best):
            self.best = self.current        

    def psoOptimize(domain,costf,noOfParticles=20, noOfRuns=30):
        particles = []
        for i in range(noOfParticles):    
            particle = Particle(domain,i)    
            particles.append(particle)    

        for i in range(noOfRuns): …

class MyClass:
    def say():
        print("hello")

mc = MyClass()
mc.say()

我收到了错误:TypeError: say() takes no arguments (1 given).我做错了什么？