Refactor code using pyupgrade for Python 3.6 (#770)

* Refactor code using pyupgrade for Python 3.6

This diff is the result of applying the following command to the
project:

```shell
find . -type f -name "*.py" -exec pyupgrade --py36-plus '{}' +
```

* Simplify yield from

instrumentation/opentelemetry-instrumentation-asgi/tests/test_asgi_middleware.py

@@ -410,7 +410,7 @@ class TestAsgiAttributes(unittest.TestCase):
     def test_request_attributes(self):
         self.scope["query_string"] = b"foo=bar"
         headers = []
-        headers.append(("host".encode("utf8"), "test".encode("utf8")))
+        headers.append((b"host", b"test"))
         self.scope["headers"] = headers
 
         attrs = otel_asgi.collect_request_attributes(self.scope)

instrumentation/opentelemetry-instrumentation-boto/src/opentelemetry/instrumentation/boto/__init__.py

@@ -235,11 +235,11 @@ def add_span_arg_tags(span, aws_service, args, args_names, args_traced):
     # Do not trace `Key Management Service` or `Secure Token Service` API calls
     # over concerns of security leaks.
     if aws_service not in {"kms", "sts"}:
-        tags = dict(
-            (name, value)
+        tags = {
+            name: value
             for (name, value) in zip(args_names, args)
             if name in args_traced
-        )
+        }
         tags = flatten_dict(tags)
 
         for param_key, value in tags.items():

instrumentation/opentelemetry-instrumentation-botocore/tests/test_botocore_instrumentation.py

@@ -115,7 +115,7 @@ class TestBotocoreInstrumentor(TestBase):
             expected[span_attributes_request_id] = request_id
 
         self.assertSpanHasAttributes(span, expected)
-        self.assertEqual("{}.{}".format(service, operation), span.name)
+        self.assertEqual(f"{service}.{operation}", span.name)
         return span
 
     @mock_ec2

instrumentation/opentelemetry-instrumentation-django/tests/test_middleware_asgi.py

@@ -334,7 +334,7 @@ class TestMiddlewareAsgi(SimpleTestCase, TestBase):
         )
         self.assertEqual(
             response.headers["traceresponse"],
-            "00-{0}-{1}-01".format(
+            "00-{}-{}-01".format(
                 format_trace_id(span.get_span_context().trace_id),
                 format_span_id(span.get_span_context().span_id),
             ),

instrumentation/opentelemetry-instrumentation-grpc/src/opentelemetry/instrumentation/grpc/_client.py

@@ -174,10 +174,7 @@ class OpenTelemetryClientInterceptor(
                 rpc_info.request = request_or_iterator
 
             try:
-                result = invoker(request_or_iterator, metadata)
-
-                for response in result:
-                    yield response
+                yield from invoker(request_or_iterator, metadata)
             except grpc.RpcError as err:
                 span.set_status(Status(StatusCode.ERROR))
                 span.set_attribute(

instrumentation/opentelemetry-instrumentation-grpc/tests/protobuf/test_server_pb2.py

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 # Generated by the protocol buffer compiler.  DO NOT EDIT!
 # source: test_server.proto
 

instrumentation/opentelemetry-instrumentation-grpc/tests/protobuf/test_server_pb2_grpc.py

@@ -3,7 +3,7 @@ import grpc
 from tests.protobuf import test_server_pb2 as test__server__pb2
 
 
-class GRPCTestServerStub(object):
+class GRPCTestServerStub:
     """Missing associated documentation comment in .proto file"""
 
     def __init__(self, channel):
@@ -34,7 +34,7 @@ class GRPCTestServerStub(object):
         )
 
 
-class GRPCTestServerServicer(object):
+class GRPCTestServerServicer:
     """Missing associated documentation comment in .proto file"""
 
     def SimpleMethod(self, request, context):
@@ -92,7 +92,7 @@ def add_GRPCTestServerServicer_to_server(servicer, server):
 
 
 # This class is part of an EXPERIMENTAL API.
-class GRPCTestServer(object):
+class GRPCTestServer:
     """Missing associated documentation comment in .proto file"""
 
     @staticmethod

instrumentation/opentelemetry-instrumentation-wsgi/src/opentelemetry/instrumentation/wsgi/__init__.py

@@ -316,8 +316,7 @@ class OpenTelemetryMiddleware:
 def _end_span_after_iterating(iterable, span, tracer, token):
     try:
         with trace.use_span(span):
-            for yielded in iterable:
-                yield yielded
+            yield from iterable
     finally:
         close = getattr(iterable, "close", None)
         if close:

scripts/generate_instrumentation_bootstrap.py

@@ -83,7 +83,7 @@ def main():
     source = astor.to_source(tree)
 
     with open(
-        os.path.join(scripts_path, "license_header.txt"), "r", encoding="utf-8"
+        os.path.join(scripts_path, "license_header.txt"), encoding="utf-8"
     ) as header_file:
         header = header_file.read()
         source = _template.format(header=header, source=source)

scripts/generate_setup.py

@@ -37,7 +37,6 @@ def main():
     root_path = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
     with open(
         os.path.join(root_path, _template_dir, _template_name),
-        "r",
         encoding="utf-8",
     ) as template:
         setuppy_tmpl = Template(template.read())

tests/opentelemetry-docker-tests/tests/celery/conftest.py

@@ -26,9 +26,9 @@ from opentelemetry.sdk.trace.export.in_memory_span_exporter import (
 
 REDIS_HOST = os.getenv("REDIS_HOST", "localhost")
 REDIS_PORT = int(os.getenv("REDIS_PORT ", "6379"))
-REDIS_URL = "redis://{host}:{port}".format(host=REDIS_HOST, port=REDIS_PORT)
-BROKER_URL = "{redis}/{db}".format(redis=REDIS_URL, db=0)
-BACKEND_URL = "{redis}/{db}".format(redis=REDIS_URL, db=1)
+REDIS_URL = f"redis://{REDIS_HOST}:{REDIS_PORT}"
+BROKER_URL = f"{REDIS_URL}/0"
+BACKEND_URL = f"{REDIS_URL}/1"
 
 
 @pytest.fixture(scope="session")

tests/opentelemetry-docker-tests/tests/celery/test_celery_functional.py

@@ -51,16 +51,16 @@ def test_instrumentation_info(celery_app, memory_exporter):
     assert run_span.parent.span_id == async_span.context.span_id
     assert run_span.context.trace_id == async_span.context.trace_id
 
-    assert async_span.instrumentation_info.name == "apply_async/{0}".format(
+    assert async_span.instrumentation_info.name == "apply_async/{}".format(
         opentelemetry.instrumentation.celery.__name__
     )
-    assert async_span.instrumentation_info.version == "apply_async/{0}".format(
+    assert async_span.instrumentation_info.version == "apply_async/{}".format(
         opentelemetry.instrumentation.celery.__version__
     )
-    assert run_span.instrumentation_info.name == "run/{0}".format(
+    assert run_span.instrumentation_info.name == "run/{}".format(
         opentelemetry.instrumentation.celery.__name__
     )
-    assert run_span.instrumentation_info.version == "run/{0}".format(
+    assert run_span.instrumentation_info.version == "run/{}".format(
         opentelemetry.instrumentation.celery.__version__
     )
 
@@ -489,9 +489,7 @@ def test_apply_async_previous_style_tasks(
 
         @classmethod
         def apply_async(cls, args=None, kwargs=None, **kwargs_):
-            return super(CelerySuperClass, cls).apply_async(
-                args=args, kwargs=kwargs, **kwargs_
-            )
+            return super().apply_async(args=args, kwargs=kwargs, **kwargs_)
 
         def run(self, *args, **kwargs):
             if "stop" in kwargs:

tests/opentelemetry-docker-tests/tests/check_availability.py

@@ -64,7 +64,7 @@ def retryable(func):
                     ex,
                 )
             time.sleep(RETRY_INTERVAL)
-        raise Exception("waiting for {} failed".format(func.__name__))
+        raise Exception(f"waiting for {func.__name__} failed")
 
     return wrapper
 

tests/opentelemetry-docker-tests/tests/sqlalchemy_tests/mixins.py

@@ -113,7 +113,7 @@ class SQLAlchemyTestMixin(TestBase):
 
     def _check_span(self, span, name):
         if self.SQL_DB:
-            name = "{0} {1}".format(name, self.SQL_DB)
+            name = f"{name} {self.SQL_DB}"
         self.assertEqual(span.name, name)
         self.assertEqual(
             span.attributes.get(SpanAttributes.DB_NAME), self.SQL_DB