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Add a Singleton metaclass, use it with Display (#48935)
* Add a Singleton class, use it with Display * update six import * Move remaining failes to display singleton * Fix rebase issues * Singleton improvements * Add code-smell for 'from __main__ import display'. ci_complete * s/self/cls/g * Add docs for no-main-display * Address linting issues * Add changelog fragment. ci_complete * Implement reentrant lock for class instantiation in Singleton * Add Display singleton porting guide
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Sanity Tests » no-main-display
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==============================
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As of Ansible 2.8, ``Display`` should no longer be imported from ``__main__``.
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``Display`` is now a singleton and should be utilized like the following::
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from ansible.utils.display import Display
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display = Display()
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There is no longer a need to attempt ``from __main__ import display`` inside
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a ``try/except`` block.
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