本文实例讲述了python自动格式化json文件的方法。分享给大家供大家参考。具体如下：

这里主要实现将代码混乱的json文件格式化。
还有一小堆python常用算法代码

完整实例代码点击此处本站下载。

class JsonFormatter:
  def __init__(self,intend=4,name=\"\"):
    self.name=name
    self.intend=intend
    self.stack=[]
    self.obj=None
    self.source=self.get_source(name)
    self.prepare()
  @staticmethod
  def json_str(s):
    return \'\"\'+s+\'\"\'
  @staticmethod
  def get_source(name):
    with open(name,\'r\') as f:
      return \'\'.join(f.read().split())
  def prepare(self):
    try:
      self.obj=eval(self.source)
    except:
      raise Exception(\'Invalid json string!\')
  def line_intend(self,level=0):
    return \'\\n\'+\' \'*self.intend*level
  def parse_dict(self,obj=None,intend_level=0):
    self.stack.append(self.line_intend(intend_level)+\'{\')
    intend_level+=1
    for key,value in obj.items():
      key=self.json_str(str(key))
      self.stack.append(self.line_intend(intend_level)+key+\':\')
      self.parse(value,intend_level)
      self.stack.append(\',\')
    self.stack.append(self.line_intend(intend_level-1)+\'}\')
  def parse_list(self,obj=None,intend_level=0):
    self.stack.append(self.line_intend(intend_level)+\'[\')
    intend_level+=1
    for item in obj:
      self.parse(item,intend_level)
      self.stack.append(\',\')
    self.stack.append(self.line_intend(intend_level-1)+\']\')
  def parse(self,obj,intend_level=0):
    if obj is None:
      self.stack.append(\'null\')
    elif obj is True:
      self.stack.append(\'true\')
    elif obj is False:
      self.stack.append(\'false\')
    elif isinstance(obj,(int,long,float)):
      self.stack.append(str(obj))
    elif isinstance(obj,str):
      self.stack.append(self.json_str(obj))
    elif isinstance(obj,(list,tuple)):
      self.parse_list(obj,intend_level)
    elif isinstance(obj,dict):
      self.parse_dict(obj,intend_level)
    else:
      raise Exception(\'Invalid json type %s!\' % obj)
  def render(self):
    self.parse(self.obj,0)
    res_file=\'good\'+self.name
    res=\'\'.join(self.stack)
    with open(res_file,\'w\') as f:
      f.write(res)
    print res
if __name__==\"__main__\":
  jf=JsonFormatter(name=\"json.txt\")
  jf.render()

希望本文所述对大家的Python程序设计有所帮助。