code: def iadd(self, other: "HistogramValuesContainer"):
      for name, values in other._data.items():
          if name in self._data:
              self._data[name].iadd(values)
          else:
              self._data[name] = values
      return self
  
imports: import typing
  from typing import MutableMapping
  from ._value import HistogramValues
  from ._plain import HistogramPlainValues
  from ._cipher import HistogramEncryptedValues
label_desc: Use image node_id 6 for calling the HistogramValuesContainer obj's underlying member method code with example usage: obj.iadd(other) and returns: self