possibly the server did not sent the 'Content-Length' header.
On Feb 2, 2008 5:18 PM, Adam W. <[EMAIL PROTECTED]> wrote: > I took this script: > http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/83208 > And decided to try it out, it works when I first download a file, and > when I try to resume a downloaded file, but if the file is already > downloaded, and I expect to see the print "File already downloaded" > message come up, I get a keyerror instead: > > Traceback (most recent call last): > File "C:\Users\Adam\Desktop\ddd.py", line 26, in <module> > if int(webPage.headers['Content-Length']) == existSize: > File "C:\Python25\lib\rfc822.py", line 384, in __getitem__ > return self.dict[name.lower()] > KeyError: 'content-length' > > Why did the key disappear? > > Here is the code I used (a little modified but functionally the same): > > import urllib, os > > class myURLOpener(urllib.FancyURLopener): > """Create sub-class in order to overide error 206. This error > means a > partial file is being sent, > which is ok in this case. Do nothing with this error. > """ > def http_error_206(self, url, fp, errcode, errmsg, headers, > data=None): > pass > > loop = 1 > dlFile = > "Okidata_Digital_B4600_Black_and_White_Laser_PrinterlacDetail.jpg" > existSize = 0 > myUrlclass = myURLOpener() > if os.path.exists(dlFile): > outputFile = open(dlFile,"ab") > existSize = os.path.getsize(dlFile) > #If the file exists, then only download the remainder > myUrlclass.addheader("Range","bytes=%s-" % (existSize)) > else: > outputFile = open(dlFile,"wb") > > webPage = myUrlclass.open("http://s3-external-1.amazonaws.com/ > wootsaleimages/%s" % dlFile) > > #If the file exists, but we already have the whole thing, don't > download again > print "flyby" > if int(webPage.headers['Content-Length']) == existSize: > loop = 0 > print "File already downloaded" > > numBytes = 0.0 > numBytes += existSize > while loop: > data = webPage.read(8192) > if not data: > break > outputFile.write(data) > numBytes += len(data) > print (float(numBytes/int(webPage.headers['Content-Length']))*100) > > webPage.close() > outputFile.close() > > for k,v in webPage.headers.items(): > print k, "=",v > print "copied", numBytes, "bytes from", webPage.url > raw_input("Cat") > -- > http://mail.python.org/mailman/listinfo/python-list > -- http://mail.python.org/mailman/listinfo/python-list
