Python模块和类 – AttributeError：模块没有属性

如果我尝试导入mystuff然后使用cfcpiano = mystuff.Piano(),我会收到一个错误：

AttributeError: module 'mystuff' has no attribute 'Piano'

如果我尝试mystuff import Piano,我会得到：

ImportError: cannot import name 'Piano'

有人可以解释发生了什么吗？我如何在Python中使用模块和类

mystuff.py

def printhello():
    print ("hello")

def timesfour(input):
    print (input * 4)


class Piano:
    def __init__(self):
        self.type = raw_input("What type of piano? ")

    def printdetails(self):
        print (self.type,"piano," + self.age)

Test.py

import mystuff 
from mystuff import Piano 
cfcpiano = mystuff.Piano()
cfcpiano.printdetails()