Python3 Migrate

venv/lib/python3.7/site-packages/urllib3/contrib/_appengine_environ.py

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+"""
+This module provides means to detect the App Engine environment.
+"""
+
+import os
+
+
+def is_appengine():
+    return "APPENGINE_RUNTIME" in os.environ
+
+
+def is_appengine_sandbox():
+    """Reports if the app is running in the first generation sandbox.
+
+    The second generation runtimes are technically still in a sandbox, but it
+    is much less restrictive, so generally you shouldn't need to check for it.
+    see https://cloud.google.com/appengine/docs/standard/runtimes
+    """
+    return is_appengine() and os.environ["APPENGINE_RUNTIME"] == "python27"
+
+
+def is_local_appengine():
+    return is_appengine() and os.environ.get("SERVER_SOFTWARE", "").startswith(
+        "Development/"
+    )
+
+
+def is_prod_appengine():
+    return is_appengine() and os.environ.get("SERVER_SOFTWARE", "").startswith(
+        "Google App Engine/"
+    )
+
+
+def is_prod_appengine_mvms():
+    """Deprecated."""
+    return False