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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def from_rfc3339(value):
 """Convert a microsecond-precision timestamp to datetime. Args: value (str):
 The RFC3339 string to convert. Returns: datetime.datetime: The datetime object equivalent to the timestamp in UTC. """

    return datetime.datetime.strptime(value, _RFC3339_MICROS).replace(tzinfo=pytz.utc)