[英]ftplib in combination with os.unlink in python
With the following code I upload file.txt to a ftp server. 使用以下代码我将file.txt上传到ftp服务器。 When the file has been uploaded I delete it on my local machine.
文件上传后,我在本地计算机上删除它。
import os
from ftplib import FTP
HOST = 'host.com'
FTP_NAME = 'username'
FTP_PASS = 'password'
filepath = 'C:\file.txt'
while True:
try:
ftp = FTP(HOST)
ftp.login(FTP_NAME, FTP_PASS)
file = open(filepath, 'r')
ftp.storlines('STOR file.txt', file)
ftp.quit()
file.close() # from this point on the file should not be in use anymore
print 'File uploaded, now deleting...'
except all_errors as e: #EDIT: Got exception here 'timed out'
print 'error' # then the upload restarted.
print str(e)
os.unlink(filepath) # now delete the file
The code works, but sometimes (every ~10th upload) I get this error message: 代码有效,但有时(每次〜第10次上传)我收到此错误消息:
Traceback (most recent call last):
in os.unlink(filepath)
WindowsError: [Error 32] The process cannot access the file
because it is being usedby another process: 'C:\file.txt'
So the file cannot be deleted because 'it has not been released' or something? 因此,文件无法删除,因为“它尚未发布”或其他什么? I also tried to unlink the file this way:
我还尝试以这种方式取消链接文件:
while True: # try to delete the file until it is deleted...
try:
os.unlink(filepath)
break
except all_errors as e:
print 'Cannot delete the File. Will try it again...'
print str(e)
But with the "try except block" I also get the same error "The process cannot access the file because it is being usedby another process"! 但是使用“try except block”我也会得到相同的错误“进程无法访问该文件,因为它正被另一个进程使用”! The script didn't even try to print the exception:
该脚本甚至没有尝试打印异常:
'Cannot delete the File. Will try it again...'
and just stopped (like above). 并且刚刚停止(如上所述)。
How can I make os.unlink do his job properly? 我怎样才能让os.unlink正确地完成他的工作? Thanks!
谢谢!
import os
from ftplib import FTP
HOST = 'host.com'
FTP_NAME = 'username'
FTP_PASS = 'password'
filepath = 'C:\file.txt'
file = open(filepath, 'r')
while True:
try:
ftp = FTP(HOST)
ftp.login(FTP_NAME, FTP_PASS)
ftp.storlines('STOR file.txt', file)
except all_errors as e: #EDIT: Got exception here 'timed out'
print 'error' # then the upload restarted.
print str(e)
else:
ftp.quit()
file.close() # from this point on the file should not be in use anymore
print 'File uploaded, now deleting...'
os.unlink(filepath) # now delete the file
break
您需要在try / except的except
脚上关闭(文件和ftp会话),否则文件将被“旧”超时ftp会话引用(因此您需要在此while
内打开文件)循环,而不是在它之外) - 关闭文件和在else
分支上的ftp会话是不够的,因为它没有摆脱失败的,超时尝试(如果有的话)的引用。
I have still problems with the code, it is not as robust as I need it to be. 我仍然遇到代码问题,它不像我需要的那样强大。 For example it is possible that the login process fails.
例如,登录过程可能会失败。 Maybe user+pass is wrong, maybe the sesrver is busy.
也许用户+传递错误,也许sesrver很忙。
try:
ftp = FTP(HOST) # HOST is a valid host address
ftp.login('test', 'test111111') # WRONG user + pass to test code robustness
ftp.quit()
except all_errors as e:
ftp.quit()
print str(e)
The problem is the ftp.quit() in the except block. 问题是except块中的ftp.quit()。 Python returns the following error (NOT exception):
Python返回以下错误(非异常):
Traceback (most recent call last):
File "test.py", line 9, in <module>
ftp.quit()
NameError: name 'ftp' is not defined
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