json做小型数据库，初始化文件的简单判断处理方法

import os
import json

# 文件操作路径(.json或者.txt文件类型皆可)
path = r'D:\我的文件'                        # 主文件夹路径
path_all = r'D:\我的文件\all_data.json'      # 所有库存记录文件数据路径
path_entry = r'D:\我的文件\entry_data.json'  # 入库记录文件数据路径
path_out = r'D:\我的文件\out_data.json'      # 出库记录文件数据路径

# 初始化JSON数据
json_all_record = '[{"编号":10000, "物品名称":"测试", "规格型号":"1-1"}]'
json_entry_record = '[{"编号":100000, "物品名称":"测试", "规格型号":"1-1}]'
json_out_record = '[{"编号":100000, "物品名称":"测试", "规格型号":"1-1"}]'

def data_write(data1,data2,data3):
    # 判断D盘是否存在该文件夹，不存在创建
    if os.path.exists(path) is False:
        # 创建文件夹
        os.mkdir(path)
        with open(path_all, 'w') as f:
            f.write(data1)
        with open(path_entry, 'w') as f:
            f.write(data2)
        with open(path_out, 'w') as f:
            f.write(data3)
        print('数据初始化成功')
    else:
        # 文件夹存在-判断数据文件是否存在
        if os.path.exists(path_all) is False:
            with open(path_all, 'w') as f:
                f.write(data1)
                if os.path.exists(path_entry) is False:
                    with open(path_entry, 'w') as f1:
                        f1.write(data2)
                        if os.path.exists(path_out) is False:
                            with open(path_out, 'w') as f2:
                                f2.write(data3)
        else:
            if os.path.exists(path_entry) is False:
                with open(path_entry, 'w') as f1:
                    f1.write(data2)
                    if os.path.exists(path_out) is False:
                        with open(path_out, 'w') as f2:
                            f2.write(data3)
            else:
                if os.path.exists(path_out) is False:
                    with open(path_out, 'w') as f2:
                        f2.write(data3)
    print('数据加载完毕')

# 调取函数
data_write(json_all_record,json_entry_record,json_out_record)