Fixes xgps for Python 3.

This replaces the obsolete 'cmp' keyword for 'sorted' with the
still-available (and more efficient) 'key' keyword.

TESTED:
Ran xgps with Python 2.7, 3.3, 3.4, and 3.5 (with appropriate
builds).

1 files changed, 1 insertions, 1 deletions

diff --git a/xgps b/xgps
index c7955b4b..79fd3fb2 100755
--- a/xgps
+++ b/xgps
@@ -785,7 +785,7 @@ class Base:
                     fld = fld[1:]
                 satellites = sorted(
                     satellites[:],
-                    cmp=lambda x, y: cmp(x[fld], y[fld]), reverse=rev)
+                    key=lambda x: x[fld], reverse=rev)
 
             for (i, satellite) in enumerate(satellites):
                 self.set_satlist_field(i, 0, satellite.PRN)