Undefined name: from six.moves import xrange for line 50

[cclauss]

Undefined names have the potential to raise NameError at runtime.

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This change is 

[k8s-ci-robot]

Hi @cclauss. Thanks for your PR.

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[pdmack]

/ok-to-test

[abhi-g]

/lgtm
/approve

[k8s-ci-robot]

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