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:
? ? ? ? ? ? break
csv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。
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