exchange receiving float

bot/commands/exchange.py

@@ -20,21 +20,17 @@ def dcr(update: Update, context: CallbackContext):
     dcr_amount = None
 
     try:
-        arg_0 = context.args[0]
-        if arg_0.isdigit():
-            dcr_amount = float(arg_0)
-        else:
-            target_currency = arg_0.upper()
+        dcr_amount = float(context.args[0])
+    except ValueError:
+        target_currency = context.args[0].upper()
     except IndexError:
         dcr_amount = 1
         target_currency = "USD"
 
     try:
-        arg_1 = context.args[1]
-        if arg_1.isdigit():
-            dcr_amount = float(arg_1)
-        else:
-            target_currency = arg_1.upper()
+        dcr_amount = float(context.args[1])
+    except ValueError:
+        target_currency = context.args[1].upper()
     except IndexError:
         if target_currency is None:
             target_currency = "USD"

bot/commands/subscription.py

@@ -55,7 +55,8 @@ def unsubscribe(update: Update, context: CallbackContext):
     try:
         observer = UserObserver.objects.get(chat_id=f"{chat.id}")
     except DoesNotExist:
-        message.reply_text(f"Observer with chat_id {chat.id} doesn't exist!\nCall /subscribe before")
+        message.reply_text(f"Observer with chat_id {chat.id} doesn't exist!\n"
+                           f"Call /subscribe before")
         return
 
     subscribed_subjects = Subject.objects(observers=observer)
@@ -84,7 +85,8 @@ def subscriptions(update: Update, context: CallbackContext):
     try:
         observer = UserObserver.objects.get(chat_id=f"{chat.id}")
     except DoesNotExist:
-        message.reply_text(f"Observer with chat_id {chat.id} doesn't exist!\nCall /subscribe before")
+        message.reply_text(f"Observer with chat_id {chat.id} doesn't exist!\n"
+                           f"Call /subscribe before")
         return
 
     subscribed_subjects = Subject.objects(observers=observer)

db/observer.py

@@ -5,7 +5,6 @@
     Document,
     StringField, IntField, ListField, DateTimeField,
     ReferenceField, NULLIFY)
-from mongoengine.errors import DoesNotExist
 from telegram.error import BadRequest
 
 from bot.core import BotTelegramCore