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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 decode_single_feature_from_dict( feature_k, feature, tfexample_dict):
 """Decode the given feature from the tfexample_dict. Args: feature_k (str):
 Feature key in the tfexample_dict feature (FeatureConnector):
 Connector object to use to decode the field tfexample_dict (dict):
 Dict containing the data to decode. Returns: decoded_feature: The output of the feature.decode_example """

  # Singleton case
  if not feature.serialized_keys:
    data_to_decode = tfexample_dict[feature_k]
  # Feature contains sub features
  else:
    # Extract the sub-features from the global feature dict
    data_to_decode = {
        k: tfexample_dict[posixpath.join(feature_k, k)]
        for k in feature.serialized_keys
    }
  return feature.decode_example(data_to_decode)