python csv实时一条一条插入且表头不重复问题
作者：loong_XL
这篇文章主要介绍了python csv实时一条一条插入且表头不重复问题，具有很好的参考价值，希望对大家有所帮助。如有错误或未考虑完全的地方，望不吝赐教
csv实时一条条插入且表头不重复
1、主要就是在最开始插入的时候判断下表头或者表格是否有数据
2、用csv reader（然后主要写是a追加模式，读是r模式）
import csv
with open("111.csv","a",encoding='utf-8',newline="") as f:
k = csv.writer(f, dialect="excel")
with open("111.csv", "r", encoding='utf-8', newline="") as f:
reader = csv.reader(f)
if not [row for row in reader]:
k.writerow(["标题", "链接", "喜欢"])
k.writerow(list)
else:
k.writerow(list)all_datas = [[1,2],[2,3],[1,2],[4,5]]
for list1 in all_datas:
with open(r"ablchange1.csv", 'a+', encoding='utf-8-sig', newline="") as f:
k = csv.writer(f, dialect="excel")
with open("ablchange1.csv", "r", encoding='utf-8-sig', newline="") as f:
reader = csv.reader(f)
if not [row for row in reader]:
k.writerow(["a","b"])
k.writerow(list1)
else:
k.writerow(list1)连续写入txt
with open("111.txt","a") as f:
for i in range(100000):
f.write(str(i)+"\n")
if i==9000:
breakcsv写入时指定表头
import csv
with open('names.csv', 'w') as csvfile:
fieldnames = ['first_name', 'last_name']
writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
writer.writeheader()
writer.writerow({'first_name': 'Baked', 'last_name': 'Beans'})
writer.writerow({'first_name': 'Lovely', 'last_name': 'Spam'})
writer.writerow({'first_name': 'Wonderful', 'last_name': 'Spam'})练习
with open('specific.csv', 'a', newline="") as csvfile:
fieldnames = ['ebayno', "pov", "mpn", "ipn", "opn"]
writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
writer.writeheader() file = open("aces_less.csv","w" , newline="")
writer = csv.DictWriter(file, fieldnames=["asin","state"])
writer.writeheader()
for i in range(len(qs)):
print(qs[i])
state = getDataById(qs[i])
print("状态 = " + state + "\n")
writer.writerow({"asin":qs[i], "state": state})以上为个人经验，希望能给大家一个参考，也希望大家多多支持脚本之家。