chore: reformat to match structure in googleapis#1481

Author: judahrand

google/auth/compute_engine/_metadata.py

@@ -60,12 +60,7 @@
 
 # The number of tries to perform when waiting for the GCE metadata server
 # when detecting the GCE environment.
-try:
-    _METADATA_DETECT_RETRIES = int(
-        os.getenv(environment_vars.GCE_METADATA_DETECT_RETRIES, "3")
-    )
-except ValueError:  # pragma: NO COVER
-    _METADATA_DETECT_RETRIES = 3
+_METADATA_DETECT_RETRIES = 3
 
 # Detect GCE Residency
 _GOOGLE = "Google"
@@ -109,9 +104,7 @@ def detect_gce_residency_linux():
     return content.startswith(_GOOGLE)
 
 
-def ping(
-    request, timeout=_METADATA_DEFAULT_TIMEOUT, retry_count=_METADATA_DETECT_RETRIES
-):
+def ping(request, timeout=_METADATA_DEFAULT_TIMEOUT, retry_count=None):
     """Checks to see if the metadata server is available.
 
     Args:
@@ -130,6 +123,14 @@ def ping(
     #       could lead to false negatives in the event that we are on GCE, but
     #       the metadata resolution was particularly slow. The latter case is
     #       "unlikely".
+    if retry_count is None:
+        retry_count = int(
+            os.getenv(
+                environment_vars.GCE_METADATA_DETECT_RETRIES,
+                _METADATA_DETECT_RETRIES,
+            )
+        )
+
     retries = 0
     headers = _METADATA_HEADERS.copy()
     headers[metrics.API_CLIENT_HEADER] = metrics.mds_ping()