Fix formatting in exception handling

Author: smoe

pandas/compat/pyarrow.py

@@ -20,7 +20,7 @@
     pa_version_under21p0 = _palv < Version("21.0.0")
     pa_version_under22p0 = _palv < Version("22.0.0")
     HAS_PYARROW = _palv >= Version(PYARROW_MIN_VERSION)
-except (ImportError,AttributeError):
+except (ImportError, AttributeError):
     pa_version_under14p0 = True
     pa_version_under14p1 = True
     pa_version_under15p0 = True