fix zero-division tests

Author: silmeth

tests/snippets/division_by_zero.py

@@ -2,33 +2,33 @@
     5 / 0
 except ZeroDivisionError:
     pass
-except:
+else:
     assert False, 'Expected ZeroDivisionError'
 
 try:
     5 / -0.0
 except ZeroDivisionError:
     pass
-except:
+else:
     assert False, 'Expected ZeroDivisionError'
 
 try:
-    5 / (3-2)
+    5 / (2-2)
 except ZeroDivisionError:
     pass
-except:
+else:
     assert False, 'Expected ZeroDivisionError'
 
 try:
     5 % 0
 except ZeroDivisionError:
     pass
-except:
+else:
     assert False, 'Expected ZeroDivisionError'
 
 try:
     raise ZeroDivisionError('Is an ArithmeticError subclass?')
 except ArithmeticError:
     pass
-except:
-    assert False, 'Expected ZeroDivisionError to be a subclass of ArithmeticError'
+else:
+    assert False, 'Expected ZeroDivisionError'