python代码实现将json中所有字段四舍五入保留n位小数

json中数据不规范，有时我们需要将数值(字符串类型的数值)统一保留多少位小数。

以下是我的代码，使用递归算法遍历json中所有的层。只要发现value值为浮点型或可转换成数值型的字符串则全部转换成浮点数；

具体代码如下：

class RoundJSON(object):

#data:需要处理的目标json，digit为保留多少位小数位默认保留4位

def round_data(self,data={},digit=4):#将data中的所有字段只要是数值则四舍五入
    if(type(data)==type({})):
        keys=data.keys()
        if (len(keys) > 0 and type(keys)!=type(None)):
            for key in keys:
                value=data.get(key)
                isnum=self.is_number(value)
                if(isnum==True):
                    value = self.roundUp(value, digit)
                    data[key] = value
                elif(type(value)==type({}) or type(value)==type([])):
                    self.round_data(value, digit)
    elif(type(data)==type([])):
        for i in range(len(data)):
            if (type(data[i]) == type({})):
                keys = data[i].keys()
                if(len(keys)>0 and type(keys)!=type(None)):
                    for key in keys:
                        value = data[i].get(key)
                        if (self.is_number(value) == True):
                            value = self.roundUp(value, digit)
                            data[i][key] = value
                        elif(type(value)==type({}) or type(value)==type([])):
                            self.round_data(value, digit)
            elif(type(data[i]) == type([]) and len(data[i])>0):
                for value in data[i]:
                    if (self.is_number(value) == True):
                        value_new = self.roundUp(value, digit)
                        data[i]=[value_new if x==value else x for x in data[i]]
                    elif (type(value) == type({}) or type(value) == type([])):
                        self.round_data(value, digit)
            else:
                if (self.is_number(data[i]) == True):
                    value_new = self.roundUp(data[i], digit)
                    data=[value_new if x==data[i] else x for x in data]
                elif (type(data[i]) == type({}) or type(data[i]) == type([])):
                    self.round_data(data[i], digit)
    return data

def is_number(self,s):  #判断字符串s是否是数值
    try:
        float(s)
        return True
    except Exception as e:
        pass
    try:
        unicodedata.numeric(s)
        return True
    except Exception as e:
        pass
    return False

def roundUp(self, value, digit):
    flag = self.is_number(value)
    if (flag == True and 'e' not in str(value)): #排除科学计数法
        result = str(value)
        if (float(value) < 0):
            result = result[1:]
            if (result != ''):
                indexDec = result.find('.')
                if (indexDec > 0):
                    decimal = result[indexDec + 1:]
                    decimalCount = len(decimal)
                    if (decimalCount > digit):
                        xiaoshu = result[indexDec + digit + 1]  # 第digit+1位小数
                        if (int(xiaoshu) > 4):
                            result = str(float(value) * -1 + pow(10, digit * -1))
                            # 存在进位的可能，小数点会移位
                            indexDec = result.find('.')
                            result = result[:indexDec + digit + 1]
                        else:
                            result = result[:indexDec + digit + 1]
                    else:
                        lens = digit - len(result[indexDec:]) + 1
                        for i in range(lens):
                            result += '0'
            result = float(result) * -1
            return result