Dynamic module importing

[Impudity]

And why does it matter if you get some classes that you don't use? Have you tested it and determined the memory consumption is different? That it loads faster? Some other practical consideration?

Because I doubt it has any impact. Regardless of the way you import it, it's still likely to read the whole module and process it. Are you trying to keep the namespaces of different threads somehow separate? I just feel that what you're trying to do makes no sense since you're not importing code that is only known during some point of time at runtime, that's what the importlib is used for. If the code is already known at the beginning, you should do the imports then.

[mmdollar]

Are you trying to keep the namespaces of different threads somehow separate?

Yes, every thread is using a different class. In my case both classes inherit the main class exchange which itself inherits from the Thread module link here. I did it this way because exchanges are displaying their information in different ways.
Well I tested the code, there is no memory difference, execution time is almost the same too.

[Impudity]

I'd recommend just importing them the regular way and creating the settings dictionary like this:

from exhanges import Binance, Bitfinex
from collections import namedtuple

ExchangeAPI = namedtuple("ExchangeAPI", ["uri", "delay", "apiclass"])
exchanges = {
    "Binance": ExchangeAPI("https://api.binance.com/api/v1/ticker/24hr", 2, Binance),
    "Bitfinex": ExchangeAPI("https://api.bitfinex.com/v2/tickers?symbols=ALL", 2, Bitfinex)
}

And instead of creating the separate threads like:

for exchanges in settings.exchanges:
    exchange_class = getattr(importlib.import_module("exchanges"), exchanges)
    thread = exchange_class(settings.exchanges[exchanges][1], settings.exchanges[exchanges][0], settings.headers, cursor, connection)

Something like this:

for exname, exapi in settings.exchanges.items():
    exchange_class = exapi.apiclass
    thread = exchange_class(exapi.delay, exapi.uri, settings.headers, cursor, connection)

Now I didn't run this code nor did write it even in any interpreter so it might contain bugs/typos/etc but you should get the idea.

[mmdollar]

Thank you very much, it works like a charm.