Add YAPF style + ignore, and format tracked Python files

SYS/env_check.py

@@ -102,8 +102,11 @@ def check_urllib3_compat() -> Tuple[bool, str]:
     # Looks good
     debug(
         "urllib3 appears usable: version=%s, exceptions=%s",
-        getattr(urllib3, "__version__", "<unknown>"),
-        hasattr(urllib3, "exceptions"),
+        getattr(urllib3,
+                "__version__",
+                "<unknown>"),
+        hasattr(urllib3,
+                "exceptions"),
     )
     return True, "OK"
 
@@ -129,7 +132,9 @@ def ensure_urllib3_ok(exit_on_error: bool = True) -> bool:
     log(border)
 
     if exit_on_error:
-        log("Please follow the steps above to fix your environment, then re-run this command.")
+        log(
+            "Please follow the steps above to fix your environment, then re-run this command."
+        )
         try:
             sys.exit(2)
         except SystemExit: