old_contents: # Copyright 2020 Google LLC
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     https://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  # =============================================================================
  # Lint as: python3
  """A generic Materialized Artifact definition."""
  
  import abc
  import pandas as pd
  
  
  class MaterializedArtifact(abc.ABC):
    """Abstract base class for materialized artifacts.
  
    Represents an output of a tfx component that has been materialized on disk.
    Subclasses provide implementations to load and display a specific artifact
    type.
    """
  
    @abc.abstractmethod
    def show(self) -> None:
      """Displays respective visualization for artifact type."""
  
    @abc.abstractproperty
    def to_dataframe(self) -> pd.Dataframe:
      """Returns dataframe representation of the artifact."""
  
new_contents: # Copyright 2020 Google LLC
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     https://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  # =============================================================================
  # Lint as: python3
  """A generic Materialized Artifact definition."""
  
  import abc
  import pandas as pd
  
  
  class MaterializedArtifact(abc.ABC):
    """Abstract base class for materialized artifacts.
  
    Represents an output of a tfx component that has been materialized on disk.
    Subclasses provide implementations to load and display a specific artifact
    type.
    """
  
    @abc.abstractmethod
    def show(self) -> None:
      """Displays respective visualization for artifact type."""
  
    @abc.abstractmethod
    def to_dataframe(self) -> pd.DataFrame:
      """Returns dataframe representation of the artifact."""
  
subject: Fix case typo in 'to_dataframe' abstract method return type.