How to resume file download in Python? -


i using python 2.7 requests module download binary file using following code, how make code "auto-resume" download partially downloaded file.

r = requests.get(self.fileurl, stream=true,  verify=false, allow_redirects=true) if r.status_code == 200:     chunk_size = 8192     bytes_read = 0     open(filesave, 'wb') f:         itrcount=1         chunk in r.iter_content(chunk_size):             itrcount=itrcount+1             f.write(chunk)             bytes_read += len(chunk)             total_per = 100 * float(bytes_read)/float(long(audiosize)+long(videosize))               self.progress_updates.emit('%d\n%s' % (total_per, 'download progress : ' + self.size_human(itrcount*chunk_size) + '/' + total_size)) r.close()

i prefer use requests module achieve if possible.

if web server supports range request can add range header request:

range: bytes=startpos-stoppos

you receive part between startpos , stoppos. if dont know stoppos use:

range: bytes=startpos-

so code be:

def resume_download(fileurl, resume_byte_pos):     resume_header = {'range': 'bytes=%d-' % resume_byte_pos}     return requests.get(fileurl, headers=resume_header, stream=true,  verify=false, allow_redirects=true)

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