Restore get_market_pairs from develop

scripts/get_market_pairs.py

@@ -1,7 +1,10 @@
+"""
+This script was adapted from ccxt here:
+https://github.com/ccxt/ccxt/blob/master/examples/py/arbitrage-pairs.py
+"""
 import os
 import sys
-
-from freqtrade.exchange import is_exchange_supported, supported_exchanges
+import traceback
 
 root = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 sys.path.append(root + '/python')
@@ -46,15 +49,22 @@ def dump(*args):
 
 
 def print_supported_exchanges():
-    dump('Supported exchanges:', green(', '.join(supported_exchanges())))
+    dump('Supported exchanges:', green(', '.join(ccxt.exchanges)))
 
 
 try:
 
+    if len(sys.argv) < 2:
+        dump("Usage: python " + sys.argv[0], green('id'))
+        print_supported_exchanges()
+        sys.exit(1)
+
     id = sys.argv[1]  # get exchange id from command line arguments
 
     # check if the exchange is supported by ccxt
-    if is_exchange_supported(id):
+    exchange_found = id in ccxt.exchanges
+
+    if exchange_found:
         dump('Instantiating', green(id), 'exchange')
 
         # instantiate the exchange by id
@@ -79,11 +89,15 @@ try:
 
         for (k, v) in tuples:
             dump('{:<15} {:<15} {:<15} {:<15}'.format(v['id'], v['symbol'], v['base'], v['quote']))
+
     else:
+
         dump('Exchange ' + red(id) + ' not found')
         print_supported_exchanges()
 
 except Exception as e:
     dump('[' + type(e).__name__ + ']', str(e))
+    dump(traceback.format_exc())
     dump("Usage: python " + sys.argv[0], green('id'))
     print_supported_exchanges()
+    sys.exit(1)