[CodeStyle][E306] add a blank line before nested function (#46895)

* [CodeStyle][E306] add a blank line before nested function

* revert changes

* add a blank line

tools/CrossStackProfiler/CspFileReader.py

@@ -178,6 +178,7 @@ class FileReader(object):
             if (self._getId(self._fileList[-1]) -
                     self._getId(self._fileList[0])) != len(self._fileList) - 1:
                 raise Exception("The file id should be countious!")
+
         # sort
         def _sortBySuffix(elem):
             return int(elem.split(".")[-1])