|
python列表求差 [x for x in data_list if x not in value_list_old] 读取已处理列表，作差得到未处理，遍历，追加文件
import os
a=["aaaa","bbbb","cccc","1","2","3","4"]
# a=["aaaa","bbbb"]
def batch_deal(data_list,save_file="readed_file.txt"):
value_list_tmp = []
value_list_old = []
row_num = 0
# 读取已处理列表
if os.path.exists(save_file):
readed_file = open(save_file,"r",encoding="utf-8")
value_list_old = readed_file.readlines()
readed_file.close()
line_num = 0
for line in value_list_old: #去除一行两端的空字符
value_list_old[line_num] = line.strip()
line_num = line_num+1
if len(value_list_old) > 0 :
value_list_tmp = [x for x in data_list if x not in value_list_old]
else:
value_list_tmp = data_list
print(value_list_tmp)
# 每处理一次，追加一次文件 ，也可以使用数据库标记一行的状态
for val in value_list_tmp:
with open(save_file,"a+",encoding="utf-8") as f:
f.write(f"{val}\n")
batch_deal(a)
|
|
|
|
|
|