class_docstr: A click parameter that parses values into pd.Timedelta objects.
  
  Parameters
  ----------
  unit : {'D', 'h', 'm', 's', 'ms', 'us', 'ns'}, optional
      Denotes the unit of the input if the input is an integer.
code: def __init__(self, unit="ns"):
      self.unit = unit
  
imports: from itertools import count
  import click
  import pandas
  from .context_tricks import CallbackManager
label_desc: Use image node_id 1 to create a new Timedelta object from inherited base classes: _DatetimeParam with example: obj = Timedelta(unit)