Данные с биржи, как получить 3,4,5,6 цифру

 import time
import requests
import threading
 
aa1 = 0
vvv = 0
tekst = (time.strftime("%m-%d`%H_%M"))
zapic = open(str(tekst) + ".txt", "w")
zapic.close()
c2 = 'USDT'
c1 = 'BTC'
print(aa1,vvv)
 
# Глобальный словарь, куда каждый поток складывает полученную информацию
stock_rates = {'b': 0}
 
 
# Получить последнюю цену с Bittrex
def get_bittrex_rates(pair):
    while True:
        try:
            stock_rates['b'] = \
            requests.get("https://bittrex.com/api/v1.1/public/getticker?market={pair}".format(pair=pair)).json()[
                'result']['Last']
        except Exception as e:
            print(e)
        time.sleep(5)
 
 
def show_results():
    while True:
        print(stock_rates['b'], time.strftime("%m.%d %H:%M", time.localtime()))
        aa1 = (stock_rates['b'])
        vvv = (time.strftime("%m.%d %H:%M"))
#        zapic = open(str(tekst) + ".txt", "a")
#        zapic.write(str(aa1) + " " + str(aa2) + " " + str(vvv) + "\n")# запись в файл .txt
#        zapic.close()
        my_list = (aa1)
        print(my_list[2,3,4,5,18,19])
        # [3,4,5,6] пробую 3,4,5,6 и 19,20 цифру получить!!
        time.sleep(10)
 
 
threads = []
 
# Подготавливаем потоки, складываем их в массив
bittrex_thread = threading.Thread(target=get_bittrex_rates, args=(c2 + '-' + c1,))
show_results_thread = threading.Thread(target=show_results)
 
threads.append(bittrex_thread)
threads.append(show_results_thread)
 
# Запускаем каждый поток
for thread in threads:
    thread.start()
 
# Ждем завершения каждого потока
for thread in threads:
    thread.join()

>>> r = requests.get('https://bittrex.com/api/v1.1/public/getmarketsummary?market=USDT-BTC')
>>> data = r.json()
>>> from pprint import pprint
>>> pprint(data)
{'message': '',
 'result': [{'Ask': 7910.37220156,
             'BaseVolume': 2459685.17361929,
             'Bid': 7899.05609551,
             'Created': '2015-12-11T06:31:40.633',
             'High': 8012.94129999,
             'Last': 7899.05609547,
             'Low': 7515.0,
             'MarketName': 'USDT-BTC',
             'OpenBuyOrders': 1958,
             'OpenSellOrders': 1002,
             'PrevDay': 7648.37517594,
             'TimeStamp': '2019-06-10T16:07:28.89',
             'Volume': 319.39814257}],
 'success': True}
 
>>>data['result'][0]['Last']
7899.05609547
>>> round(data['result'][0]['Last'],2)
7899.06

import requests
 
r = requests.get('https://bittrex.com/api/v1.1/public/getmarketsummary?market=USDT-BTC')
data = r.json()
 
resultat = data['result'][0]['Last']
 
print("%.8f" % resultat)

Python 2.7.12 (v2.7.12:d33e0cf91556, Jun 27 2016, 15:19:22) [MSC v.1500 32 bit (Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> help(round)
Help on built-in function round in module __builtin__:
 
round(...)
    round(number[, ndigits]) -> floating point number
    
    Round a number to a given precision in decimal digits (default 0 digits).
    This always returns a floating point number.  Precision may be negative.
 
>>>

Python 3.8.0a1 (tags/v3.8.0a1:e75eeb00b5, Feb  3 2019, 19:46:54) [MSC v.1916 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license()" for more information.
>>> help(round)
Help on built-in function round in module builtins:
 
round(number, ndigits=None)
    Round a number to a given precision in decimal digits.
    
    The return value is an integer if ndigits is omitted or None.  Otherwise
    the return value has the same type as the number.  ndigits may be negative.
 
>>>

Python 3.7.3 (v3.7.3:ef4ec6ed12, Mar 25 2019, 22:22:05) [MSC v.1916 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> help(round)
Help on built-in function round in module builtins:
 
round(number, ndigits=None)
    Round a number to a given precision in decimal digits.
 
    The return value is an integer if ndigits is omitted or None.  Otherwise
    the return value has the same type as the number.  ndigits may be negative.
 
>>>

Python 3.7.3 (v3.7.3:ef4ec6ed12, Mar 25 2019, 22:22:05) [MSC v.1916 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import requests
>>>
>>> r = requests.get('https://bittrex.com/api/v1.1/public/getmarketsummary?market=USDT-BTC')
>>> data = r.json()
>>>
>>> resultat = data['result'][0]['Last']
>>> ts = data['result'][0]['Created']
>>> print("%.8f" % resultat,ts)
7952.94766633 2015-12-11T06:31:40.633
>>>

Python 3.7.3 (v3.7.3:ef4ec6ed12, Mar 25 2019, 22:22:05) [MSC v.1916 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import requests
>>>
>>> r = requests.get('https://bittrex.com/api/v1.1/public/getmarketsummary?market=USDT-BTC')
>>> data = r.json()
>>>
>>> resultat = data['result'][0]['Last']
>>> ts = data['result'][0]['Created']
>>> print("%.8f" % resultat,ts)
7955.09993167 2015-12-11T06:31:40.633
>>>
>>> round(data['result'][0]['Last'],2) # вывод две цифры после точки
7955.1
>>> round(data['result'][0]['Last'],8) #Вывод восемь цифр после точки
7955.09993167
>>>

print(round(data['result'][0]['Last'],2))