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274a1c37 - Use key in dict for existence checks (#167285)

Use key in dict for existence checks (#167285) Summary: This PR uses `key in dict` expressions for existence checks of dict elements in Python code. This operation is more efficient than `key in dict.keys()`. X-link: https://github.com/pytorch/pytorch/pull/167285 Approved by: https://github.com/mlazos Reviewed By: donigian Differential Revision: D86529114 fbshipit-source-id: 59918412b1142cb1267be4675b2f78d81ab74634