是的,将__repr__
代码移至__str__
,然后调用str()
您的树或将其传递给print
语句。记住也要__str__
在递归调用中使用:
class node(object):
def __init__(self, value, children = []):
self.value = value
self.children = children
def __str__(self, level=0):
ret = "\t"*level+repr(self.value)+"\n"
for child in self.children:
ret += child.__str__(level+1)
return ret
def __repr__(self):
return '<tree node representation>'
演示:
>>> root = node('grandmother')
>>> root.children = [node('daughter'), node('son')]
>>> root.children[0].children = [node('granddaughter'), node('grandson')]
>>> root.children[1].children = [node('granddaughter'), node('grandson')]
>>> root
<tree node representation>
>>> str(root)
"'grandmother'\n\t'daughter'\n\t\t'granddaughter'\n\t\t'grandson'\n\t'son'\n\t\t'granddaughter'\n\t\t'grandson'\n"
>>> print root
'grandmother'
'daughter'
'granddaughter'
'grandson'
'son'
'granddaughter'
'grandson'