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from vtkmodules.vtkImagingCore import vtkRTAnalyticSource
w1 = vtkRTAnalyticSource()()
w2 = vtkRTAnalyticSource()()
try:
import numpy
# In case numpy is available we're able to compare data arrays as well
# along with just identity. If data arrays have the same contents, i.e.
# if the two objects are essentially clones, this equality test should
# pass
assert w1 == w2
except:
# When numpy is not available fall back to the default VTK behavior which
# only tests for identity. In that case w1 and w2 are not considered equal
assert w1 != w2
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