Matt Martz 9773a1f289 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		2018-11-20 17:06:51 -06:00
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sanity	Add a Singleton metaclass, use it with Display (#48935)	2018-11-20 17:06:51 -06:00