无法理解 csv.reader

如何解决无法理解 csv.reader

这里是 Python 新手，请原谅我的无知。我正在使用从 Google 和 this site 中找到的脚本来处理 Google Analytics Reporting API (v4) 和 Google Search Console API。

该脚本尝试按页面和按查询获取基本分析数据，例如点击次数和展示次数，并将其保存到 csv 文件中。由于此数据分布在 2 个 API 中，因此脚本分别提取和保存数据，然后使用函数 update_file(flags) 组合 4 个 csv 文件的内容。例如，一个文件包含为相关网站生成展示次数的所有 Google 搜索查询的列表。此处的标志是命令行参数 - 站点 URL、开始日期和结束日期。

def update_file(flags):
  #Combining all the data previously collected and stored in 3 seperate csv files into one global csv file
  print("Merging files")
  basic_url = flags.property_uri
  basic_url = basic_url.replace("://","_")
  basic_url = basic_url.replace(".","-")  
  
  matchfile ="Landingpage_analytics_"+flags.start_date+"_"+flags.end_date+"_"+basic_url+".csv"
  
  matchfile2 ='Landingpage_'+flags.start_date+"_"+flags.end_date+"_"+basic_url+".csv"
  matchfile3 ="Keyword_"+flags.start_date+"_"+flags.end_date+"_"+basic_url+".csv"
  csvfile="Landingpage_keyword_"+basic_url+"_"+flags.start_date+"_"+flags.end_date+".csv"
  newfile="Global_report_"+basic_url+"_"+flags.start_date+"_"+flags.end_date+".csv"
  print(matchfile)
  print(matchfile2)
  print(matchfile3)
  new_data=[] 
  new_data2=[]
  new_data3=[]
  with open(csvfile) as fin,open(matchfile) as fmatch,open(matchfile2) as fmatch2,open(matchfile3) as fmatch3,open(newfile,'w') as fout:
    reader = csv.reader(fin)
    checker = csv.reader(fmatch)
    checker2 = csv.reader(fmatch2)
    checker3 = csv.reader(fmatch3)
    writer = csv.writer(fout)
    header_reader = next(reader)
    next(checker)
    next(checker2)
    next(checker3)
    header_checker =["Clicks Keyword","Impressions Keyword","Avg. Pos. Keyword","CTR Keyword","Clicks Landingpage","Impressions Landingpage","Avg. Pos. Landingpage","CTR Landingpage","GA Sessions","GA Bouncerate","GA Avg session duration","GA Avg. Pages/Session"]
    new_header = header_reader + header_checker
    writer.writerow(new_header)
    analytics = {}
    keyword = {}
    landingpage = {}

    for a in checker3:
      keyword[a[0]]=[a[2],a[1],a[3],float(a[2])/float(a[1])]

    for b in checker2:
      landingpage[b[0]]=[b[2],b[1],b[3],float(b[2])/float(b[1])]

    for xl in checker:
      url = flags.property_uri+xl[0]
      analytics[url] = [xl[1],float(xl[2])/float(xl[1]),xl[3],xl[4]]

    for i in reader:
      if i[0] in keyword:
        newrow = i + keyword[i[0]]
      else:
        # if keyword doesn't have specific data
        newrow = i + ['N/A','N/A','N/A']
      new_data.append(newrow)

    for i in new_data:
      if i[1] in landingpage:
        newrow = i + landingpage[i[1]]
      else:
        # if landingpage doesn't have specific data
        newrow = i + ['N/A','N/A']      
      new_data2.append(newrow)


    for i in new_data2:
      if i[1] in analytics:
        newrow = i + analytics[i[1]]
        new_data3.append(newrow)  

    new_data3.sort(key=lambda row: float(row[2]),reverse=True)
    writer.writerows(new_data3)

update_file(flags) 函数不起作用，正在生成一个空文件。我尝试调试并发现 matchfile、fmatch 和 csv 阅读器 checker 引用的文件在 update_file(flags) 运行之前有内容，但之后为空。

for xl in checker:
      url = flags.property_uri+xl[0]
      analytics[url] = [xl[1],xl[4]]

analytics 在这些行之后保持为空，但 keyword 和 landingpage 包含正确的数据并使用类似的代码。我不确定发生了什么。我是否遗漏了什么可能导致这些文件返回空的内容？