Downloader¶
-
class
parfive.
Downloader
(max_conn=5, progress=True, file_progress=True, loop=None, notebook=None, overwrite=False, headers=None)[source]¶ Bases:
object
Download files in parallel.
- Parameters
max_conn (int, optional) – The number of parallel download slots.
progress (bool, optional) – If True show a main progress bar showing how many of the total files have been downloaded. If False, no progress bars will be shown at all.
file_progress (bool, optional) – If True and
progress
is true, showmax_conn
progress bars detailing the progress of each individual file being downloaded.loop (asyncio.AbstractEventLoop, optional) – The event loop to use to download the files. If not specified a new loop will be created and executed in a new thread so it does not interfere with any currently running event loop.
notebook (bool, optional) – If True tqdm will be used in notebook mode. If None an attempt will be made to detect the notebook and guess which progress bar to use.
overwrite (bool or str, optional) – Determine how to handle downloading if a file already exists with the same name. If False the file download will be skipped and the path returned to the existing file, if True the file will be downloaded and the existing file will be overwritten, if ‘unique’ the filename will be modified to be unique.
headers (dict) – Request headers to be passed to the server. Adds User-Agent information about parfive, aiohttp and python if not passed explicitely.
Attributes Summary
The total number of files already queued for download.
Methods Summary
download
([timeouts])Download all files in the queue.
enqueue_file
(url[, path, filename, overwrite])Add a file to the download queue.
retry
(results)Retry any failed downloads in a results object.
Attributes Documentation
-
queued_downloads
¶ The total number of files already queued for download.
Methods Documentation
-
download
(timeouts=None)[source]¶ Download all files in the queue.
- Parameters
timeouts (dict, optional) – Overrides for the default timeouts for http downloads. Supported keys are any accepted by the aiohttp.ClientTimeout class. Defaults to 5 minutes for total session timeout and 90 seconds for socket read timeout.
- Returns
filenames – A list of files downloaded.
- Return type
parfive.Results
Notes
The defaults for the ‘total’ and ‘sock_read’ timeouts can be overridden by two environment variables
PARFIVE_TOTAL_TIMEOUT
andPARFIVE_SOCK_READ_TIMEOUT
.
-
enqueue_file
(url, path=None, filename=None, overwrite=None, **kwargs)[source]¶ Add a file to the download queue.
- Parameters
url (str) – The URL to retrieve.
path (str, optional) – The directory to retrieve the file into, if None defaults to the current directory.
filename (str or callable, optional) – The filename to save the file as. Can also be a callable which takes two arguments the url and the response object from opening that URL, and returns the filename. (Note, for FTP downloads the response will be
None
.) If None the HTTP headers will be read for the filename, or the last segment of the URL will be used.overwrite (bool or str, optional) – Determine how to handle downloading if a file already exists with the same name. If False the file download will be skipped and the path returned to the existing file, if True the file will be downloaded and the existing file will be overwritten, if ‘unique’ the filename will be modified to be unique. If None the value set when constructing the ~parfive.Downloader object will be used.
kwargs (dict) – Extra keyword arguments are passed to aiohttp.ClientSession.get or aioftp.Client.context depending on the protocol.
Notes
Proxy URL is read from the environment variables HTTP_PROXY or HTTPS_PROXY, depending on the protocol of the url passed. Proxy Authentication proxy_auth should be passed as a aiohttp.BasicAuth object. Proxy Headers proxy_headers should be passed as dict object.
-
retry
(results)[source]¶ Retry any failed downloads in a results object.
Note
This will start a new event loop.
- Parameters
results (parfive.Results) – A previous results object, the
.errors
property will be read and the downloads retried.- Returns
results – A modified version of the input
results
with all the errors from this download attempt and any new files appended to the list of file paths.- Return type
parfive.Results