python getpass模块：隐藏不显示输入的密码

案例：

import getpass                                  #用于隐藏用户输入的字符串，常用来接收密码
def checkuser(user,passwd):
    if user == 'chenhang' and passwd == '123456':
        return True
    else:
        return False
if __name__ == "__main__":
    userr = input('Input the user:')
    passwdd = getpass.getpass('Input the passwd:')
    if checkuser(userr,passwdd):
        print('OK!')
    else:
        print('ERROR!')