From 1e1be6bc3f068aeaafffb1fcb4a46d0ef7223143 Mon Sep 17 00:00:00 2001
From: Samuel Husso <shusso@iki.fi>
Date: Mon, 4 Jun 2018 12:35:51 +0300
Subject: [PATCH] arguments,configuration: fstring in use

---
 freqtrade/arguments.py     | 2 +-
 freqtrade/configuration.py | 5 ++---
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/freqtrade/arguments.py b/freqtrade/arguments.py
index 04af2a6df..331bb73a0 100644
--- a/freqtrade/arguments.py
+++ b/freqtrade/arguments.py
@@ -72,7 +72,7 @@ class Arguments(object):
         self.parser.add_argument(
             '--version',
             action='version',
-            version='%(prog)s {}'.format(__version__),
+            version=f'%(prog)s {__version__}'
         )
         self.parser.add_argument(
             '-c', '--config',
diff --git a/freqtrade/configuration.py b/freqtrade/configuration.py
index 0b484c57a..1f14df560 100644
--- a/freqtrade/configuration.py
+++ b/freqtrade/configuration.py
@@ -236,9 +236,8 @@ class Configuration(object):
         exchange = config.get('exchange', {}).get('name').lower()
         if exchange not in ccxt.exchanges:
 
-            exception_msg = 'Exchange "{}" not supported.\n' \
-                            'The following exchanges are supported: {}'\
-                .format(exchange, ', '.join(ccxt.exchanges))
+            exception_msg = f'Exchange "{exchange}" not supported.\n' \
+                            f'The following exchanges are supported: {", ".join(ccxt.exchanges)}'
 
             logger.critical(exception_msg)
             raise OperationalException(