Fixes Python programs to use new-style classes.

Although this isn't strictly a Python 3 requirement, using the
new-style class definition syntax improves consistency between Python
2 and Python 3.  Old-style classes have been deprecated since Python
2.2, but many such definitions linger on.  Python 3 eliminates
old-style classes, but instead of complaining about old-style
definitions, it simply unconditionally and silently makes all classes
new-style.  The only incompatible differences are quite subtle and
rarely matter in practice, but things are more consistent across
versions if the new-style definitions are used.

Also, the preferred method for subclasses to invoke parent init
methods is via the super() construct, which is only available with
new-style classes.  Using super() is especially useful with multiple
inheritance, which it handles automatically (provided that the init
methods have compatible signatures).

TESTED:
Using an SConstruct patched to run the build helpers with the target
Python, ran "scons build-all check ", as well as gpsprof and xgps,
with all six supported Python versions (except 2.6 for xgps).

1 files changed, 4 insertions, 4 deletions

diff --git a/gpssim.py b/gpssim.py
index fb686e67..69c3da17 100644
--- a/gpssim.py
+++ b/gpssim.py
@@ -12,7 +12,7 @@ import gps, gpslib
 # and a satellite with specified orbital elements in the sky.
 
 
-class ksv:
+class ksv(object):
     "Kinematic state vector."
 
     def __init__(self, time=0, lat=0, lon=0, alt=0, course=0,
@@ -61,7 +61,7 @@ class ksv:
 # <http://www.wolffdata.se/gps/gpshtml/anomalies.html>
 
 
-class satellite:
+class satellite(object):
     "Orbital elements of one satellite. PRESENTLY A STUB"
 
     def __init__(self, prn):
@@ -88,7 +88,7 @@ class gpssimException(BaseException):
         return '"%s", %d:' % (self.filename, self.lineno)
 
 
-class gpssim:
+class gpssim(object):
     "Simulate a moving sensor, with skyview."
     active_PRNs = list(range(1, 24 + 1)) + [134, ]
 
@@ -186,7 +186,7 @@ class gpssim:
 MPS_TO_KNOTS = 1.9438445	# Meters per second to knots
 
 
-class NMEA:
+class NMEA(object):
     "NMEA output generator."
 
     def __init__(self):