treeprinter 0.0.2

树打印机
============

此库提供了一种树打印机类，用于轻松显示树形结构

## 安装
``` sh
$ pip install treeprinter
```

## 基本用法

### 打印机实例
``` python
from treeprinter import TreePrinter

class Tree(object)
def __init__(self, tag, children=None)
self.children = children or []
self.tag = tag

tree = Tree("animal", [
Tree("cat"),
Tree("dog", [Tree("chihuahua"), Tree("dalmatian")]),
Tree("wolf")])

printer = TreePrinter('children', 'tag')
printer.pprint(tree)
```
```
animal
|
---------------------------
| | |
cat dog wolf
|
----------
| |
chihuahua dalmatian
```

### 打印机装饰器
您也可以通过如下装饰器来实现类，从而实现\_\_str\_\_方法，以获得相同的结果
``` python
@TreePrinter('children', 'tag')
class Tree(object)
def __init__(self, tag, children=None)
self.children = children or []
self.tag = tag

print(tree)
```


## 扩展
您可以通过实现基本显示器来扩展此库
(见printers/json_printer.py)

``` python
from treeprinter import JsonPrinter

printer = JsonPrinter()
json = {
"fruits": ["Apple", "Banana", "Pear"],
"presidents": {
"France": ["Sarkozy", "Hollande"],
"USA": ["Trump", "Obama"]
},
"star": "Sun"
}
printer.pprint(json)
```

```
{}
|
--------------------------------------
| | |
{presidents} [fruits] star
| | |
---------------- -------------- Sun
| | | | |
[France] [USA] Apple Banana Pear
| |
--------- ------
| | | |
Sarkozy Hollande Trump Obama
```