在Python中打印树数据结构
在Python中打印树数据结构
提问于 2013-11-27 20:25:50
我正在寻找一种可能的树打印实现，它以用户友好的方式打印树，而不是作为object的实例。
我在网上发现了这个解决方案：
来源：http://cbio.ufs.ac.za/live_docs/nbn_tut/trees.html
class node(object):
def __init__(self, value, children = []):
self.value = value
self.children = children
def __repr__(self, level=0):
ret = "\t"*level+repr(self.value)+"\n"
for child in self.children:
ret += child.__repr__(level+1)
return ret此代码以以下方式打印树：
'grandmother'
'daughter'
'granddaughter'
'grandson'
'son'
'granddaughter'
'grandson'有没有可能在不更改__repr__方法的情况下得到相同的结果，因为我正在将它用于另一个目的。
编辑：
无需修改__repr__和__str__的解决方案
def other_name(self, level=0):
print '\t' * level + repr(self.value)
for child in self.children:
child.other_name(level+1)回答 2
Stack Overflow用户
回答已采纳
发布于 2013-11-27 20:26:45
是的，将__repr__代码移到__str__，然后在树上调用str()或将其传递给print语句。记住在递归调用中也要使用__str__：
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'Stack Overflow用户
发布于 2016-09-27 20:27:19
为什么不将其存储为treelib object并将其打印出来，就像我们打印CHAID树输出here一样，其中包含与您的用例相关的更多相关节点描述？
([], {0: 809, 1: 500}, (sex, p=1.47145310169e-81, chi=365.886947811, groups=[['female'], ['male']]))
├── (['female'], {0: 127, 1: 339}, (embarked, p=9.17624191599e-07, chi=24.0936494474, groups=[['C', '<missing>'], ['Q', 'S']]))
│ ├── (['C', '<missing>'], {0: 11, 1: 104}, <Invalid Chaid Split>)
│ └── (['Q', 'S'], {0: 116, 1: 235}, <Invalid Chaid Split>)
└── (['male'], {0: 682, 1: 161}, (embarked, p=5.017855245e-05, chi=16.4413525404, groups=[['C'], ['Q', 'S']]))
├── (['C'], {0: 109, 1: 48}, <Invalid Chaid Split>)
└── (['Q', 'S'], {0: 573, 1: 113}, <Invalid Chaid Split>)页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/20242479
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