Lambda / Client / list_layers

list_layers#

Lambda.Client.list_layers(**kwargs)#

Lists Lambda layers and shows information about the latest version of each. Specify a runtime identifier to list only layers that indicate that they’re compatible with that runtime. Specify a compatible architecture to include only layers that are compatible with that instruction set architecture.

Request Syntax

response = client.list_layers(
    CompatibleRuntime='nodejs'|'nodejs4.3'|'nodejs6.10'|'nodejs8.10'|'nodejs10.x'|'nodejs12.x'|'nodejs14.x'|'nodejs16.x'|'java8'|'java8.al2'|'java11'|'python2.7'|'python3.6'|'python3.7'|'python3.8'|'python3.9'|'dotnetcore1.0'|'dotnetcore2.0'|'dotnetcore2.1'|'dotnetcore3.1'|'dotnet6'|'dotnet8'|'nodejs4.3-edge'|'go1.x'|'ruby2.5'|'ruby2.7'|'provided'|'provided.al2'|'nodejs18.x'|'python3.10'|'java17'|'ruby3.2'|'ruby3.3'|'python3.11'|'nodejs20.x'|'provided.al2023'|'python3.12'|'java21',
    Marker='string',
    MaxItems=123,
    CompatibleArchitecture='x86_64'|'arm64'
)

Parameters:

CompatibleRuntime (string) –
A runtime identifier. For example, java21.

The following list includes deprecated runtimes. For more information, see Runtime deprecation policy.
Marker (string) – A pagination token returned by a previous call.
MaxItems (integer) – The maximum number of layers to return.
CompatibleArchitecture (string) – The compatible instruction set architecture.

Return type:

dict

Returns:

Response Syntax

{
    'NextMarker': 'string',
    'Layers': [
        {
            'LayerName': 'string',
            'LayerArn': 'string',
            'LatestMatchingVersion': {
                'LayerVersionArn': 'string',
                'Version': 123,
                'Description': 'string',
                'CreatedDate': 'string',
                'CompatibleRuntimes': [
                    'nodejs'|'nodejs4.3'|'nodejs6.10'|'nodejs8.10'|'nodejs10.x'|'nodejs12.x'|'nodejs14.x'|'nodejs16.x'|'java8'|'java8.al2'|'java11'|'python2.7'|'python3.6'|'python3.7'|'python3.8'|'python3.9'|'dotnetcore1.0'|'dotnetcore2.0'|'dotnetcore2.1'|'dotnetcore3.1'|'dotnet6'|'dotnet8'|'nodejs4.3-edge'|'go1.x'|'ruby2.5'|'ruby2.7'|'provided'|'provided.al2'|'nodejs18.x'|'python3.10'|'java17'|'ruby3.2'|'ruby3.3'|'python3.11'|'nodejs20.x'|'provided.al2023'|'python3.12'|'java21',
                ],
                'LicenseInfo': 'string',
                'CompatibleArchitectures': [
                    'x86_64'|'arm64',
                ]
            }
        },
    ]
}

Response Structure

(dict) –
- NextMarker (string) –
  
  A pagination token returned when the response doesn’t contain all layers.
- Layers (list) –
  
  A list of function layers.
  - (dict) –
    
    Details about an Lambda layer.
    - LayerName (string) –
      
      The name of the layer.
    - LayerArn (string) –
      
      The Amazon Resource Name (ARN) of the function layer.
    - LatestMatchingVersion (dict) –
      
      The newest version of the layer.
      - LayerVersionArn (string) –
        
        The ARN of the layer version.
      - Version (integer) –
        
        The version number.
      - Description (string) –
        
        The description of the version.
      - CreatedDate (string) –
        
        The date that the version was created, in ISO 8601 format. For example, 2018-11-27T15:10:45.123+0000.
      - CompatibleRuntimes (list) –
        
        The layer’s compatible runtimes.
        
        The following list includes deprecated runtimes. For more information, see Runtime deprecation policy.
        
        (string) –
      - LicenseInfo (string) –
        
        The layer’s open-source license.
      - CompatibleArchitectures (list) –
        
        A list of compatible instruction set architectures.
        
        (string) –

Exceptions

Examples

The following example returns information about layers that are compatible with the Python 3.7 runtime.

response = client.list_layers(
    CompatibleRuntime='python3.7',
)

print(response)

Expected Output:

{
    'Layers': [
        {
            'LatestMatchingVersion': {
                'CompatibleRuntimes': [
                    'python3.6',
                    'python3.7',
                ],
                'CreatedDate': '2018-11-15T00:37:46.592+0000',
                'Description': 'My layer',
                'LayerVersionArn': 'arn:aws:lambda:us-east-2:123456789012:layer:my-layer:2',
                'Version': 2,
            },
            'LayerArn': 'arn:aws:lambda:us-east-2:123456789012:layer:my-layer',
            'LayerName': 'my-layer',
        },
    ],
    'ResponseMetadata': {
        '...': '...',
    },
}