4.2 代理迭代:

4.2 代理迭代:

你构建了一个自定义容器对象,里面包含了列表,元组或其他可迭代对象。

class Node:
  def __init__(self, value):
    self._value = value
    self._children = []
# Example
if __name__ == '__main__':
   root = Node(0)
   print root
   print type(root)


C:Python27python.exe C:/Users/TLCB/PycharmProjects/untitled/mycompany/Django/a36.py
<__main__.Node instance at 0x01D9BDF0>
<type 'instance'>


将实例转换成字符串:

class Node:
  def __init__(self, value):
    self._value = value
    self._children = []

  def __repr__(self):
      return 'Node({!r})'.format(self._value)
# Example
if __name__ == '__main__':
   root = Node(0)
   print root
   print type(root)

C:Python27python.exe C:/Users/TLCB/PycharmProjects/untitled/mycompany/Django/a36.py
Node(0)
<type 'instance'>

Process finished with exit code 0


class Node:
  def __init__(self, value):
    self._value = value
    self._children = []

  # def __repr__(self):
  #     return 'Node({!r})'.format(self._value)

  def add_child(self, node):
      self._children.append(node)
# Example
if __name__ == '__main__':
   root = Node(0)
   print root
   print type(root)
   child1 = Node(1)
   child2 = Node(2)
   print '--------------'
   print child1
   print child2
   root.add_child(child1)
   root.add_child(child2)
   print root._children
   print '1111111111111'
   for x in root._children:
       print x


C:Python27python.exe C:/Users/TLCB/PycharmProjects/untitled/mycompany/Django/a36.py
<__main__.Node instance at 0x024DF940>
<type 'instance'>
--------------
<__main__.Node instance at 0x024CF0D0>
<__main__.Node instance at 0x02513DF0>
[<__main__.Node instance at 0x024CF0D0>, <__main__.Node instance at 0x02513DF0>]
1111111111111
<__main__.Node instance at 0x024CF0D0>
<__main__.Node instance at 0x02513DF0>

Process finished with exit code 0


class Node:
  def __init__(self, value):
    self._value = value
    self._children = []

  # def __repr__(self):
  #     return 'Node({!r})'.format(self._value)

  def add_child(self, node):
      self._children.append(node)

  def __iter__(self):
      return iter(self._children)
# Example
if __name__ == '__main__':
   root = Node(0)
   print root
   print type(root)
   child1 = Node(1)
   child2 = Node(2)
   print '--------------'
   print child1
   print child2
   root.add_child(child1)
   root.add_child(child2)
   print root._children
   print '1111111111111'
   for x in root:
       print x

C:Python27python.exe C:/Users/TLCB/PycharmProjects/untitled/mycompany/Django/a36.py
<__main__.Node instance at 0x02733DF0>
<type 'instance'>
--------------
<__main__.Node instance at 0x0273C3A0>
<__main__.Node instance at 0x0273C3C8>
[<__main__.Node instance at 0x0273C3A0>, <__main__.Node instance at 0x0273C3C8>]
1111111111111
<__main__.Node instance at 0x0273C3A0>
<__main__.Node instance at 0x0273C3C8>