Comments (1)
In order to be a bit nice on people's server infrastructure, and prevent FTP error 421 "Too many connections", use semaphores to limit number of simultaneous FTP connections.
Helpful examples of Python 3 implementations of Semaphores in asyncio:
- http://www.artificialworlds.net/blog/2017/06/27/adding-a-concurrency-limit-to-pythons-asyncio-as_completed/
- https://compiletoi.net/fast-scraping-in-python-with-asyncio/
- https://stackoverflow.com/questions/40836800/python-asyncio-semaphore-in-async-await-function#40836870
Official Python3 API docs on the implementation:
https://docs.python.org/3/library/asyncio-sync.html#semaphores
Note use of async with sem:
syntax in Python 3.6? But earlier versions (e.g. Python 3.4/3.5 ) may use something like with (yield from sem):
or with (await sem)
.
from cryospheric-data-lakes.
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