class_docstr: Defined by J. Welles Wilder, Jr. in 1978 in his book *"New Concepts in
  Technical Trading Systems"* for the ATR
  
  Records the "true low" which is the minimum of today's low and
  yesterday's close
  
  Formula:
    - truelow = min(low, close_prev)
  
  See:
    - http://en.wikipedia.org/wiki/Average_true_range
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code: def __init__(self):
      self.lines.truelow = Min(self.data.low, self.data.close(-1))
      super(TrueLow, self).__init__()
  
file_path: backtrader/backtrader/indicators/atr.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  from .None import Indicator, Max, Min, MovAv
label_desc: Use image node_id 1 to create a new TrueLow object from inherited base classes: Indicator with example: obj = TrueLow()