Use tz.UTC in favor of tz.tzutc() where possible.#910
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To allow the UTC object to be accessible from the functions in `dateutil.tz.tz` such as `gettz` and datetime_exists, it is necessary to define the UTC constant here and import it into `dateutil.tz`. This is a very minor performance improvement, avoiding a call to the `tzutc()` constructor.
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This was referenced Mar 11, 2021
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Summary of changes
In version 2.7.0, we added the
tz.UTCobject as a convenience accessor for thetzutcsingleton. This PR goes updates other modules and tests that were usingtzutc()to usetz.UTC, except where it doesn't make sense to do so.Pull Request Checklist