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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 get_feature_from_key(self, feature_key):
 """ Get feature for the provided feature key. Args: feature_key: Feature key for which feature is to be fetched. Returns: Feature corresponding to the provided feature key. """

    feature = self.feature_key_map.get(feature_key)

    if feature:
      return feature

    self.logger.error('Feature "%s" is not in datafile.' % feature_key)
    return None