在Python中有时候回因为内存溢出问题不能一次性读取一个大Json文件，这个时候可以将它拆成N个小json文件，用来测试我们的代码，小数据测试起来也比较快。

下面是代码，供参考

count = 0

for count,line in enumerate(open(r"data.json",'rU',encoding='utf-8')):
    pass
    count += 1

print("文件总行数：",count)
split = 5 # 拆成五个文件
nums = [ (count*i//split) for i in range(1,split+1)]
print(nums)
# 拆分文件
import json
current_lines = 0
data_list = []
# 打开大文件，拆成小文件
with open('data.json', 'r',encoding='utf-8') as file:
    i = 0
    for line in file:
        line = line.replace('},','}')
        data_list.append(json.loads(line))
        current_lines +=1
        if current_lines in nums:
            print(current_lines)
            # 保存文件
            file_name = './data_tmp/data_' + str(current_lines) + '.json'
            with open(file_name,'w',encoding = 'utf-8') as f:
                #print(len(data_list))
                data = json.dumps(data_list)
                f.write(data)
                data_list = []
                data = []