docstr: Return the label for time x at position pos
docstr_tok: ["Return","the","label","for","time","x","at","position","pos"]
code: def __call__(self, y, pos=0):
      """Return the label for time x at position pos"""
  
      if y > self.volmax * 1.20:
          return ""
  
      y = int(y / self.divisor)
      return "%d%s" % (y, self.suffix)
  
file_path: backtrader/backtrader/plot/formatters.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import matplotlib.dates
  import matplotlib.ticker
  from ..utils import num2date
label_desc: Use image node_id 2 for calling the MyVolFormatter obj's underlying member method code with example usage: obj.__call__(y, pos) and returns: unknown, str