Fixed overly general exception in Python code.

Pylint discovered that I was raising Exception,
which was overly general. I didn't mean to do that;
it was supposed to be my custom exception type
astronomy.Error instead. So I fixed that case.

There were also some deprecated settings in the
pylint configuration file, so I fixed those too.

demo/python/astronomy.py

@@ -6955,7 +6955,7 @@ def SphereFromVector(vector):
     dist = math.sqrt(xyproj + vector.z*vector.z)
     if xyproj == 0.0:
         if vector.z == 0.0:
-            raise Exception('Zero-length vector not allowed.')
+            raise Error('Zero-length vector not allowed.')
         lon = 0.0
         if vector.z < 0.0:
             lat = -90.0

generate/pylintrc

@@ -103,9 +103,7 @@ disable=invalid-name,
         chained-comparison,
         consider-using-in,
         too-many-nested-blocks,
-        too-many-instance-attributes,
-        bad-whitespace,
-        bad-continuation
+        too-many-instance-attributes
 
 # Enable the message, report, category or checker with the given id(s). You can
 # either give multiple identifier separated by comma (,) or put this option
@@ -576,5 +574,4 @@ preferred-modules=
 
 # Exceptions that will emit a warning when being caught. Defaults to
 # "BaseException, Exception".
-overgeneral-exceptions=BaseException,
-                       Exception
+overgeneral-exceptions=builtins.BaseException, builtins.Exception

generate/template/astronomy.py

@@ -5449,7 +5449,7 @@ def SphereFromVector(vector):
     dist = math.sqrt(xyproj + vector.z*vector.z)
     if xyproj == 0.0:
         if vector.z == 0.0:
-            raise Exception('Zero-length vector not allowed.')
+            raise Error('Zero-length vector not allowed.')
         lon = 0.0
         if vector.z < 0.0:
             lat = -90.0

source/python/astronomy/astronomy.py

@@ -6955,7 +6955,7 @@ def SphereFromVector(vector):
     dist = math.sqrt(xyproj + vector.z*vector.z)
     if xyproj == 0.0:
         if vector.z == 0.0:
-            raise Exception('Zero-length vector not allowed.')
+            raise Error('Zero-length vector not allowed.')
         lon = 0.0
         if vector.z < 0.0:
             lat = -90.0