Feature: multiprocessing in initialize_trade_thresholds

[josefigueredo]

First of all thanks for sharing the project.

When I add a lot of alt coins the initialize_trade_thresholds is very slow. I added multi core support to speed it a little. Hope you find it useful.

import multiprocessing as mp

def get_coin_value(client, coin_dict, coin):
    coin_dict_price = float(get_market_ticker_price(client, coin_dict + 'USDT'))
    coin_price = float(get_market_ticker_price(client, coin + 'USDT'))
    return coin_dict, coin, coin_dict_price / coin_price

def add_coin(results):
    coin_dict = results[0]
    coin = results[1]
    price = results[2]
    g_state.coin_table[coin_dict][coin] = price

def initialize_trade_thresholds(client):
    '''
    Initialize the buying threshold of all the coins for trading between them
    '''
    global g_state
    
    pool = mp.Pool(processes=14) # core count - 2
    for coin_dict in g_state.coin_table.copy():
        for coin in supported_coin_list:
            if coin != coin_dict:
                pool.apply_async(get_coin_value, args = (client, coin_dict, coin, ), callback = add_coin)
    pool.close()
    pool.join()

    with open(g_state._table_backup_file, "w") as backup_file:
        json.dump(g_state.coin_table, backup_file)

[edeng23]

Looks good :)
Do you mind opening a pull request?