tests: Rewrite some tests so they can run without needing eval/exec.

For builds without the compiler enabled (and hence without eval/exec) it is
useful to still be able to run as many tests as possible.

tests/basics/op_error.py

@@ -1,44 +1,89 @@
 # test errors from bad operations (unary, binary, etc)
 
-def test_exc(code, exc):
-    try:
-        exec(code)
-        print("no exception")
-    except exc:
-        print("right exception")
-    except:
-        print("wrong exception")
-
 # unsupported unary operators
-test_exc("~None", TypeError)
-test_exc("~''", TypeError)
-test_exc("~[]", TypeError)
-test_exc("~bytearray()", TypeError)
+try:
+    ~None
+except TypeError:
+    print('TypeError')
+try:
+    ~''
+except TypeError:
+    print('TypeError')
+try:
+    ~[]
+except TypeError:
+    print('TypeError')
+try:
+    ~bytearray()
+except TypeError:
+    print('TypeError')
 
 # unsupported binary operators
-test_exc("False in True", TypeError)
-test_exc("1 * {}", TypeError)
-test_exc("1 in 1", TypeError)
-test_exc("bytearray() // 2", TypeError)
+try:
+    False in True
+except TypeError:
+    print('TypeError')
+try:
+    1 * {}
+except TypeError:
+    print('TypeError')
+try:
+    1 in 1
+except TypeError:
+    print('TypeError')
+try:
+    bytearray() // 2
+except TypeError:
+    print('TypeError')
 
 # object with buffer protocol needed on rhs
-test_exc("bytearray(1) + 1", TypeError)
+try:
+    bytearray(1) + 1
+except TypeError:
+    print('TypeError')
 
 # unsupported subscription
-test_exc("1[0]", TypeError)
-test_exc("1[0] = 1", TypeError)
-test_exc("''['']", TypeError)
-test_exc("'a'[0] = 1", TypeError)
-test_exc("del 1[0]", TypeError)
+try:
+    1[0]
+except TypeError:
+    print('TypeError')
+try:
+    1[0] = 1
+except TypeError:
+    print('TypeError')
+try:
+    ''['']
+except TypeError:
+    print('TypeError')
+try:
+    'a'[0] = 1
+except TypeError:
+    print('TypeError')
+try:
+    del 1[0]
+except TypeError:
+    print('TypeError')
 
 # not callable
-test_exc("1()", TypeError)
+try:
+    1()
+except TypeError:
+    print('TypeError')
 
 # not an iterator
-test_exc("next(1)", TypeError)
+try:
+    next(1)
+except TypeError:
+    print('TypeError')
 
 # must be an exception type
-test_exc("raise 1", TypeError)
+try:
+    raise 1
+except TypeError:
+    print('TypeError')
 
 # no such name in import
-test_exc("from sys import youcannotimportmebecauseidontexist", ImportError)
+try:
+    from sys import youcannotimportmebecauseidontexist
+except ImportError:
+    print('ImportError')