code: def __init__(self, vmin=None, vmax=None, vcenter=None, clip=False):
      self.vcenter = vcenter
      super().__init__(vmin, vmax, clip)
  
file_path: matplotlib/galleries/users_explain/colors/colormapnorms.py
imports: import matplotlib.pyplot
  import numpy
  from matplotlib import cm
  import matplotlib.cbook
  import matplotlib.colors
label_desc: Use image node_id 1 to create a new MidpointNormalize object from inherited base classes: colors with example: obj = MidpointNormalize(vmin, vmax, vcenter, clip)