don't use bare except

use "except Exception", or if really needed explicitly "except BaseException"

electrum/scripts/txbroadcast.py

@@ -12,7 +12,7 @@ from electrum.simple_config import SimpleConfig
 
 try:
     rawtx = sys.argv[1]
-except:
+except Exception:
     print("usage: txbroadcast rawtx")
     sys.exit(1)
 

electrum/scripts/txradar.py

@@ -9,7 +9,7 @@ from electrum.simple_config import SimpleConfig
 
 try:
     txid = sys.argv[1]
-except:
+except Exception:
     print("usage: txradar txid")
     sys.exit(1)