python 程序执行无结果

CODE:

class FooClass (object):
    """My very first class: FooClass"""
    version = 0.1
def __init__(self,nm="John Doe"):
    """constructor"""
    self.name = nm
    print 'Created a class instrance for', nm
def showname(self):
    """display instance attribute and class name"""
    print 'Your name is ',self.name
    print 'My name is ',self.__class__.__name__
def showver(self):
    """display class(static) attribute"""
    print self.version
def addMe2Me(self,x):
    """apply + operation to argument"""
    return x+x


fool=FooClass()