diff --git a/exporter/opentelemetry-exporter-prometheus/src/opentelemetry/exporter/prometheus/__init__.py b/exporter/opentelemetry-exporter-prometheus/src/opentelemetry/exporter/prometheus/__init__.py
index c0b8729546..4c90329778 100644
--- a/exporter/opentelemetry-exporter-prometheus/src/opentelemetry/exporter/prometheus/__init__.py
+++ b/exporter/opentelemetry-exporter-prometheus/src/opentelemetry/exporter/prometheus/__init__.py
@@ -379,7 +379,9 @@ def _create_info_metric(
     ) -> InfoMetricFamily:
         """Create an Info Metric Family with list of attributes"""
         # sanitize the attribute names according to Prometheus rule
-        attributes = {self._sanitize(key): value for key, value in attributes.items()}
+        attributes = {
+            self._sanitize(key): value for key, value in attributes.items()
+        }
         info = InfoMetricFamily(name, description, labels=attributes)
         info.add_metric(labels=list(attributes.keys()), value=attributes)
         return info
diff --git a/exporter/opentelemetry-exporter-prometheus/tests/test_prometheus_exporter.py b/exporter/opentelemetry-exporter-prometheus/tests/test_prometheus_exporter.py
index 268665ab2c..db920a5c73 100644
--- a/exporter/opentelemetry-exporter-prometheus/tests/test_prometheus_exporter.py
+++ b/exporter/opentelemetry-exporter-prometheus/tests/test_prometheus_exporter.py
@@ -394,7 +394,12 @@ def test_target_info_sanitize(self):
         metric_reader = PrometheusMetricReader()
         provider = MeterProvider(
             metric_readers=[metric_reader],
-            resource=Resource({"system.os": "Unix", "system.name": "Prometheus Target Sanitize"}),
+            resource=Resource(
+                {
+                    "system.os": "Unix",
+                    "system.name": "Prometheus Target Sanitize",
+                }
+            ),
         )
         meter = provider.get_meter("getting-started", "0.1.2")
         counter = meter.create_counter("counter")
@@ -403,13 +408,16 @@ def test_target_info_sanitize(self):
 
         self.assertEqual(type(prometheus_metric), InfoMetricFamily)
         self.assertEqual(prometheus_metric.name, "target")
-        self.assertEqual(
-            prometheus_metric.documentation, "Target metadata"
-        )
+        self.assertEqual(prometheus_metric.documentation, "Target metadata")
         self.assertTrue(len(prometheus_metric.samples) == 1)
         self.assertEqual(prometheus_metric.samples[0].value, 1)
         self.assertTrue(len(prometheus_metric.samples[0].labels) == 2)
         self.assertTrue("system_os" in prometheus_metric.samples[0].labels)
-        self.assertEqual(prometheus_metric.samples[0].labels["system_os"], "Unix")
+        self.assertEqual(
+            prometheus_metric.samples[0].labels["system_os"], "Unix"
+        )
         self.assertTrue("system_name" in prometheus_metric.samples[0].labels)
-        self.assertEqual(prometheus_metric.samples[0].labels["system_name"], "Prometheus Target Sanitize")
+        self.assertEqual(
+            prometheus_metric.samples[0].labels["system_name"],
+            "Prometheus Target Sanitize",
+        )