code: def __init__(self, val, unit=1.0):
      self.unit = unit
      self._val = val * unit
  
file_path: matplotlib/galleries/examples/units/evans_test.py
imports: import matplotlib.pyplot
  import numpy
  import matplotlib.ticker
  import matplotlib.units
label_desc: Use image node_id 1 to create a new Foo object  with example: obj = Foo(val, unit)