docstr: Get standard deviation for each layer
docstr_tok: ["Get","standard","deviation","for","each","layer"]
code: def _getstddev(self):
      """Get standard deviation for each layer"""
      return [math.sqrt(self.var[i]) for i in self.bands]
  
file_path: pillow/src/PIL/ImageStat.py
imports: from __future__ import annotations
  import math
label_desc: Use image node_id 11 for calling the Stat obj's underlying member method code with example usage: obj._getstddev() and returns: unknown