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Add a convenience func to retrieve the internal attr. hist.

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#! /usr/bin/env python3
from tango import DeviceProxy
from numpy import array, transpose
def get_internal_attribute_history(device: DeviceProxy, attribute_name: str, depth: int = 10):
try:
history = array(device.attribute_history(attr_name = attribute_name, depth = depth))
except Exception as e:
raise ValueError("Cannot access the internal history of the attribute '{}/{}'.".format(device.name(), attribute_name)) from e
history_values = array([entry.value for entry in history])
values = history_values.transpose()
return values
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