输入结果有误

源自：3-1 用Python定义类

输入结果有误

为什么执行老师的程序，class OldStyle:
 def _init_(self,name,description):
  self.name=name
  self.description=description
class NewStyle(object):
 def _init_(self,name,description):
  self.name=name
  self.description=description
if __name__=='_main_':
 old=OldStyle('old','OldStyle')
 print(old)
 print (type(old))
 print(dir(old))
 print('-------------------------------------')
 new=NewStyle('new','NewStyle')
 print (type(new))
 print(dir(new))

编译成功，却没结果

提问者：慕函数8028368 2018-12-05 08:20

个回答

沐枫自然

2018-12-05 17:40:59

class OldStyle:
#这里__init__是两下划线哦
def __init__(self, name, description):
self.name = name
self.description = description

class NewStyle(object):
#这里也__init__是两下划线哦
def __init__(self, name, description):
self.name = name
self.description = description

# 这里是 '__main__' 是两下划线哦因为：__name__ == '_main_' 是不相等，所以这个if下的代码就没在执行
if __name__ == '__main__':
old = OldStyle('old', 'OldStyle')
print(old)
print(type(old))
print(dir(old))
print('-------------------------------------')
new = NewStyle('new', 'NewStyle')
print(type(new))
print(dir(new))
0