def update_pipeline(pipeline=None):
    """
    Updates a specified pipeline with edits or changes to its structure. Use a JSON file with the pipeline structure in conjunction with UpdatePipeline to provide the full structure of the pipeline. Updating the pipeline increases the version number of the pipeline by 1.
    See also: AWS API Documentation
    
    
    :example: response = client.update_pipeline(
        pipeline={
            'name': 'string',
            'roleArn': 'string',
            'artifactStore': {
                'type': 'S3',
                'location': 'string',
                'encryptionKey': {
                    'id': 'string',
                    'type': 'KMS'
                }
            },
            'stages': [
                {
                    'name': 'string',
                    'blockers': [
                        {
                            'name': 'string',
                            'type': 'Schedule'
                        },
                    ],
                    'actions': [
                        {
                            'name': 'string',
                            'actionTypeId': {
                                'category': 'Source'|'Build'|'Deploy'|'Test'|'Invoke'|'Approval',
                                'owner': 'AWS'|'ThirdParty'|'Custom',
                                'provider': 'string',
                                'version': 'string'
                            },
                            'runOrder': 123,
                            'configuration': {
                                'string': 'string'
                            },
                            'outputArtifacts': [
                                {
                                    'name': 'string'
                                },
                            ],
                            'inputArtifacts': [
                                {
                                    'name': 'string'
                                },
                            ],
                            'roleArn': 'string'
                        },
                    ]
                },
            ],
            'version': 123
        }
    )
    
    
    :type pipeline: dict
    :param pipeline: [REQUIRED]
            The name of the pipeline to be updated.
            name (string) -- [REQUIRED]The name of the action to be performed.
            roleArn (string) -- [REQUIRED]The Amazon Resource Name (ARN) for AWS CodePipeline to use to either perform actions with no actionRoleArn, or to use to assume roles for actions with an actionRoleArn.
            artifactStore (dict) -- [REQUIRED]The Amazon S3 location where artifacts are stored for the pipeline. If this Amazon S3 bucket is created manually, it must meet the requirements for AWS CodePipeline. For more information, see the Concepts .
            type (string) -- [REQUIRED]The type of the artifact store, such as S3.
            location (string) -- [REQUIRED]The location for storing the artifacts for a pipeline, such as an S3 bucket or folder.
            encryptionKey (dict) --The encryption key used to encrypt the data in the artifact store, such as an AWS Key Management Service (AWS KMS) key. If this is undefined, the default key for Amazon S3 is used.
            id (string) -- [REQUIRED]The ID used to identify the key. For an AWS KMS key, this is the key ID or key ARN.
            type (string) -- [REQUIRED]The type of encryption key, such as an AWS Key Management Service (AWS KMS) key. When creating or updating a pipeline, the value must be set to 'KMS'.
            
            stages (list) -- [REQUIRED]The stage in which to perform the action.
            (dict) --Represents information about a stage and its definition.
            name (string) -- [REQUIRED]The name of the stage.
            blockers (list) --Reserved for future use.
            (dict) --Reserved for future use.
            name (string) -- [REQUIRED]Reserved for future use.
            type (string) -- [REQUIRED]Reserved for future use.
            
            actions (list) -- [REQUIRED]The actions included in a stage.
            (dict) --Represents information about an action declaration.
            name (string) -- [REQUIRED]The action declaration's name.
            actionTypeId (dict) -- [REQUIRED]The configuration information for the action type.
            category (string) -- [REQUIRED]A category defines what kind of action can be taken in the stage, and constrains the provider type for the action. Valid categories are limited to one of the values below.
            owner (string) -- [REQUIRED]The creator of the action being called.
            provider (string) -- [REQUIRED]The provider of the service being called by the action. Valid providers are determined by the action category. For example, an action in the Deploy category type might have a provider of AWS CodeDeploy, which would be specified as CodeDeploy.
            version (string) -- [REQUIRED]A string that identifies the action type.
            runOrder (integer) --The order in which actions are run.
            configuration (dict) --The action declaration's configuration.
            (string) --
            (string) --
            
            outputArtifacts (list) --The name or ID of the result of the action declaration, such as a test or build artifact.
            (dict) --Represents information about the output of an action.
            name (string) -- [REQUIRED]The name of the output of an artifact, such as 'My App'.
            The input artifact of an action must exactly match the output artifact declared in a preceding action, but the input artifact does not have to be the next action in strict sequence from the action that provided the output artifact. Actions in parallel can declare different output artifacts, which are in turn consumed by different following actions.
            Output artifact names must be unique within a pipeline.
            
            inputArtifacts (list) --The name or ID of the artifact consumed by the action, such as a test or build artifact.
            (dict) --Represents information about an artifact to be worked on, such as a test or build artifact.
            name (string) -- [REQUIRED]The name of the artifact to be worked on, for example, 'My App'.
            The input artifact of an action must exactly match the output artifact declared in a preceding action, but the input artifact does not have to be the next action in strict sequence from the action that provided the output artifact. Actions in parallel can declare different output artifacts, which are in turn consumed by different following actions.
            
            roleArn (string) --The ARN of the IAM service role that will perform the declared action. This is assumed through the roleArn for the pipeline.
            
            
            version (integer) --The version number of the pipeline. A new pipeline always has a version number of 1. This number is automatically incremented when a pipeline is updated.
            

    :rtype: dict
    :return: {
        'pipeline': {
            'name': 'string',
            'roleArn': 'string',
            'artifactStore': {
                'type': 'S3',
                'location': 'string',
                'encryptionKey': {
                    'id': 'string',
                    'type': 'KMS'
                }
            },
            'stages': [
                {
                    'name': 'string',
                    'blockers': [
                        {
                            'name': 'string',
                            'type': 'Schedule'
                        },
                    ],
                    'actions': [
                        {
                            'name': 'string',
                            'actionTypeId': {
                                'category': 'Source'|'Build'|'Deploy'|'Test'|'Invoke'|'Approval',
                                'owner': 'AWS'|'ThirdParty'|'Custom',
                                'provider': 'string',
                                'version': 'string'
                            },
                            'runOrder': 123,
                            'configuration': {
                                'string': 'string'
                            },
                            'outputArtifacts': [
                                {
                                    'name': 'string'
                                },
                            ],
                            'inputArtifacts': [
                                {
                                    'name': 'string'
                                },
                            ],
                            'roleArn': 'string'
                        },
                    ]
                },
            ],
            'version': 123
        }
    }
    
    
    :returns: 
    (string) --
    (string) --
    
    
    
    """
    pass
