Разделил код на файлы. Рефакторинг кода. Теперь можно писать на родном языке курс валюты (e.g: 2 рубля в доллары)

function/convert.py

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+import yaml
+import requests
+
+import json
+import re
+
+from decimal import Decimal, ROUND_DOWN
+from function.format_number import format_number
+
+config = yaml.safe_load(open('config.yaml'))
+
+coinapi_len = len(config['coinapi_keys'])
+coinapi_active = [0]
+
+
+class Converter:
+    def __init__(self):
+        self.amount: float = 1.0
+        self.conv_amount: float = 0.0
+        self.from_currency: str = ''
+        self.conv_currency: str = ''
+
+    def convert(self) -> None:
+        if not self.ddg():
+            self.coinapi()
+
+        number = Decimal(str(self.conv_amount))
+
+        self.conv_amount = format_number(number.quantize(Decimal('1.00'), rounding=ROUND_DOWN))
+
+    def ddg(self) -> bool:
+        res = requests.get('https://duckduckgo.com/js/spice/currency'
+                           f'/{self.amount}'
+                           f'/{self.from_currency}'
+                           f'/{self.conv_currency}')
+
+        data = json.loads(re.findall(r'\(\s*(.*)\s*\);$', res.text)[0])
+
+        del data['terms']
+        del data['privacy']
+        del data['timestamp']
+
+        if len(data.get('to')) == 0:
+            return False
+
+        conv = data.get('to')[0]
+        conv_amount = conv.get('mid')
+
+        if conv_amount is None:
+            raise RuntimeError('Ошибка при конвертации валюты через DuckDuckGo')
+
+        self.conv_amount = float(conv_amount)
+
+        return True
+
+    def coinapi(self, depth: int = config['coinapi_keys']) -> None:
+        if depth <= 0:
+            raise RecursionError('Rate limit on all tokens')
+
+        resp = requests.get(
+            (
+                'https://rest.coinapi.io/v1/exchangerate'
+                f'/{self.from_currency}'
+                f'/{self.conv_currency}'
+            ),
+            headers={
+                'X-CoinAPI-Key': config['coinapi_keys'][coinapi_active[0]],
+            },
+            timeout=config['timeout'],
+        )
+
+        if resp.status_code == 429:
+            rotate_token(config['coinapi_keys'], coinapi_active)
+            self.coinapi(depth - 1)
+
+        data = resp.json()
+        rate = data.get('rate')
+        if rate is None:
+            raise RuntimeError('Failed to get the exchange rate from CoinAPI')
+
+        self.conv_amount = float(rate * self.amount)
+
+
+def rotate_token(lst, active) -> None:
+    active[0] = (active[0] + 1) % len(lst)

function/format_number.py

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+def format_number(number):
+    number_str = str(number)
+
+    if '.' in number_str:
+        integer_part, fractional_part = number_str.split('.')
+    else:
+        integer_part, fractional_part = number_str, ''
+
+    formatted_integer_part = '{:,}'.format(int(integer_part)).replace(',', ' ')
+
+    if fractional_part:
+        return formatted_integer_part + '.' + fractional_part
+    else:
+        return formatted_integer_part