python csv写入，为啥头信息会重复

第一次写的头信息只写入一次，正常

复制粘贴改了一些东西后，就每次都会写入一次头了

正常的第一次

tag_list = []
for tags in text['items']:
    #print(type(tags))
    tag = tags['tag']

    tag = tag_list.append(tag)
    #print(tag_list)

#把标签和原文件内容一起写进新文件
tag_list = str(tag_list).replace('[','').replace(']','').replace('\'','')
tou = ['title','content','baidu_tag']

with open('ahahaha22333.csv','a+',encoding='utf-8',newline='') as f:
    fwriter = csv.writer(f)

    csvrow1 = []
    csvrow2 = []
    csvrow3 = []

    csvrow1.append(d['title'])
    csvrow2.append(d['content'])
    csvrow3.append(tag_list)
    fwriter.writerow(tou)
    fwriter.writerows(zip(csvrow1,csvrow2,csvrow3))

    n = n + 1
    print(str(n))


#------------------------------------------------

copy改动版后头信息会重复写入的


try:
    summary = text['summary']

except Exception as eee:
    print('---eee')
    print(eee)
    summary = '_'
#print(summary)
tou = ['title','content','summary']
with open('ahahaha22333.csv','a+',encoding='utf-8',newline='') as f:

    fwriter = csv.writer(f)

    csvrow1 = []
    csvrow2 = []
    csvrow3 = []

    csvrow1.append(d['title'])
    csvrow2.append(d['content'])
    csvrow3.append(summary)
    #fwriter.writerow(tou)
    fwriter.writerows(zip(csvrow1,csvrow2,csvrow3))

    n = n + 1
    print(str(n))

调试下，注意以下几个地方
检查写入的文件本身有没有内容
fwriter.writerow(tou)
这个是写入表头的，检查下它的内容，是不是只包含一个表头
然后检查下它是不是只被调用了一次