Python-未找到连接适配器

时间:2019-11-14 21:43:04

标签: python python-3.x

我遇到了一个令人沮丧的问题,我不知道如何解决。我想测试该脚本以从ftp服务器下载某些内容:

import requests
import sys
import time

def downloadFile(url, directory) :
  localFilename = url.split('/')[-1]
  print(url)
  with open(directory + '/' + localFilename, 'wb') as f:
    start = time.clock()
    r = requests.get(url, stream=True)
    total_length = r.headers.get('content-length')
    dl = 0
    if total_length is None: # no content length header
      f.write(r.content)
    else:
      for chunk in r.iter_content(1024):
        dl += len(chunk)
        f.write(chunk)
        done = int(50 * dl / total_length)
        sys.stdout.write("\r[%s%s] %s bps" % ('=' * done, ' ' * (50-done), dl//(time.clock() - start)))
        print("")
  return (time.clock() - start)

def main() :
  if len(sys.argv) > 1 :
        url = sys.argv[1]
  else :
        url = input("Enter the URL : ")
  directory = input("Where would you want to save the file ?")

  time_elapsed = downloadFile(url, directory)
  print( "Download complete...")
  print ("Time Elapsed: " + time_elapsed)


if __name__ == "__main__" :
  main()

我使用的网址是ftp://ftp.cdc.gov/pub/Health_Statistics/NCHS/Datasets/CHDI/CHR2010_051010.xlsx,但运行它时出现错误:

  File "C:\Users\Pigeon\AppData\Local\Programs\Python\Python36\lib\site-packages\requests\sessions.py", line 731, in get_adapter
    raise InvalidSchema("No connection adapters were found for '%s'" % url)
requests.exceptions.InvalidSchema: No connection adapters were found for 'ftp://ftp.cdc.gov/pub/Health_Statistics/NCHS/Datasets/CHDI/CHR2010_051010.xlsx'

有人知道为什么会发生吗? 感谢您的答复

1 个答案:

答案 0 :(得分:0)

这意味着requests无法说出url中指定的协议,即FTP。通常,它用于说HTTP

在URL(实际上是URI)中,scheme指定用于对话框的协议。

在您的情况下为FTP,因为URI的前缀为ftp://

请查看here,以详细了解构成URI的组件及其含义。

有一些特定的库可以“说” FTP(文件传输协议)

例如标准ftplib

但是如果您想/需要使用requests,可以尝试使用requests-ftp

如前所述,它为requests库提供了FTP传输适配器。