python: Make exception handling Python 3 safe

Change-Id: I9c2cdfad20deb1ddfa224320cf93f2105d126652
Reviewed-on: https://gem5-review.googlesource.com/c/15980
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>

src/python/m5/ticks.py

@@ -47,8 +47,8 @@ def setGlobalFrequency(ticksPerSecond):
     elif isinstance(ticksPerSecond, str):
         tps = round(convert.anyToFrequency(ticksPerSecond))
     else:
-        raise TypeError, \
-              "wrong type '%s' for ticksPerSecond" % type(ticksPerSecond)
+        raise TypeError(
+            "wrong type '%s' for ticksPerSecond" % type(ticksPerSecond))
     _m5.core.setClockFrequency(int(tps))
 
 # how big does a rounding error need to be before we warn about it?
@@ -58,13 +58,13 @@ def fromSeconds(value):
     import _m5.core
 
     if not isinstance(value, float):
-        raise TypeError, "can't convert '%s' to type tick" % type(value)
+        raise TypeError("can't convert '%s' to type tick" % type(value))
 
     # once someone needs to convert to seconds, the global frequency
     # had better be fixed
     if not _m5.core.clockFrequencyFixed():
-        raise AttributeError, \
-              "In order to do conversions, the global frequency must be fixed"
+        raise AttributeError(
+              "In order to do conversions, the global frequency must be fixed")
 
     if value == 0:
         return 0