json.dump()
直接把常用参数列一下好了
参数名 解释
obj 要存入json文件的python对象
fp 文件句柄
ensure_ascii 设置为False的话才可以把中文以中文的形式存到文件里，否则会是’\xXX\xXX’这种
indent 缩进的空格数，设置为非零值时，就起到了格式化的效果，比较美观
也就是说在使用json.dump()的时候设置一下indent参数的值就好了。比如json.dump(json_dict, f, indent=4)，加与不加的区别如下：
{“title_pinyin”:”gywxw”,”title”:”隔云勿相望”,”url”:”http://www.ty2016.net/book/gywxw/“,”description”:”大学刚毕业，她嫁给了林安森可是结婚三年，电视上常看到他出席各种场合携女相伴，她却再没再亲眼见过他。”}
1
{
“title_pinyin”:”gywxw”,
“title”:”隔云勿相望”,
“url”:”http://www.ty2016.net/book/gywxw/“,
“description”:”大学刚毕业，她嫁给了林安森可是结婚三年，电视上常看到他出席各种场合携女相伴，她却再没再亲眼见过他。”
}
递归实现代码：
# -*- encoding: utf-8 -*- class JsonFormatter: def __init__(self, intend=4, name="", encoding="utf-8"): ''' intend: 缩进空格数 name: 文件名 encoding: 文件编码 ''' self.name = name self.intend = intend self.encoding = encoding self.stack = [] self.obj = None self.source = self.get_source(name, self.encoding) self.prepare() @staticmethod def json_str(s): ''' 给字符串套上双引号 ''' return '"' + s + '"' @staticmethod def get_source(name, encoding="utf-8"): with open(name, 'r', encoding=encoding) as f: # 当不给split函数传递任何参数时，分隔符sep会采用任意形式的空白字符：空格、tab、换行、回车以及换页符 return ''.join(f.read().split()) def prepare(self): try: # python对象和json格式还是略有不同 self.source = self.source.replace("null", "None").replace("true", "True").replace("false", "False") self.obj = eval(self.source) except: # json string 一定满足python dict和list的组合 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): if intend_level == 0: # 这个判断是为了防止文件开头出现空行 self.stack.append('{') else: self.stack.append(self.line_intend(intend_level)+'{') intend_level += 1 i = 0 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) if i != len(obj.items())-1: # 这个处理是为了防止最后一对kv后面还有个逗号，这样会造成json.load()函数无法读取 self.stack.append(',') i += 1 self.stack.append(self.line_intend(intend_level-1)+'}') def parse_list(self, obj=None, intend_level=0): if intend_level == 0: self.stack.append('[') else: self.stack.append(self.line_intend(intend_level)+'[') intend_level += 1 for i, item in zip(range(0, len(obj)), obj): self.parse(item, intend_level) if i != len(obj)-1: 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, 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 = self.name res = ''.join(self.stack) with open(res_file, 'w', encoding=self.encoding) as f: f.write(res) if __name__ == "__main__": jf = JsonFormatter(name="json.txt") jf.render()文章来源: Python格式化保存json文件