tests: Format all Python code with black, except tests in basics subdir.

This adds the Python files in the tests/ directory to be formatted with
./tools/codeformat.py.  The basics/ subdirectory is excluded for now so we
aren't changing too much at once.

In a few places `# fmt: off`/`# fmt: on` was used where the code had
special formatting for readability or where the test was actually testing
the specific formatting.

1 files changed, 3 insertions, 1 deletions

diff --git a/tests/internal_bench/var-7-instance-meth.py b/tests/internal_bench/var-7-instance-meth.py
index f9d463f40..2ed7800be 100644
--- a/tests/internal_bench/var-7-instance-meth.py
+++ b/tests/internal_bench/var-7-instance-meth.py
@@ -1,17 +1,19 @@
 import bench
 
-class Foo:
 
+class Foo:
     def __init__(self):
         self._num = 20000000
 
     def num(self):
         return self._num
 
+
 def test(num):
     o = Foo()
     i = 0
     while i < o.num():
         i += 1
 
+
 bench.run(test)