@@ -348,10 +348,10 @@ def _generate_authentication_header_map(
348348class AwsSecurityCredentials :
349349 """A class that models AWS security credentials with an optional session token.
350350
351- Attributes:
352- access_key_id (str): The AWS security credentials access key id.
353- secret_access_key (str): The AWS security credentials secret access key.
354- session_token (Optional[str]): The optional AWS security credentials session token. This should be set when using temporary credentials.
351+ Attributes:
352+ access_key_id (str): The AWS security credentials access key id.
353+ secret_access_key (str): The AWS security credentials secret access key.
354+ session_token (Optional[str]): The optional AWS security credentials session token. This should be set when using temporary credentials.
355355 """
356356
357357 access_key_id : str
@@ -420,7 +420,6 @@ def __init__(self, credential_source):
420420
421421 @_helpers .copy_docstring (AwsSecurityCredentialsSupplier )
422422 def get_aws_security_credentials (self , context , request ):
423-
424423 # Check environment variables for permanent credentials first.
425424 # https://docs.aws.amazon.com/general/latest/gr/aws-sec-cred-types.html
426425 env_aws_access_key_id = os .environ .get (environment_vars .AWS_ACCESS_KEY_ID )
@@ -688,8 +687,8 @@ def __init__(
688687 )
689688 else :
690689 environment_id = credential_source .get ("environment_id" ) or ""
691- self ._aws_security_credentials_supplier = _DefaultAwsSecurityCredentialsSupplier (
692- credential_source
690+ self ._aws_security_credentials_supplier = (
691+ _DefaultAwsSecurityCredentialsSupplier ( credential_source )
693692 )
694693 self ._cred_verification_url = credential_source .get (
695694 "regional_cred_verification_url"
@@ -759,8 +758,10 @@ def retrieve_subject_token(self, request):
759758
760759 # Retrieve the AWS security credentials needed to generate the signed
761760 # request.
762- aws_security_credentials = self ._aws_security_credentials_supplier .get_aws_security_credentials (
763- self ._supplier_context , request
761+ aws_security_credentials = (
762+ self ._aws_security_credentials_supplier .get_aws_security_credentials (
763+ self ._supplier_context , request
764+ )
764765 )
765766 # Generate the signed request to AWS STS GetCallerIdentity API.
766767 # Use the required regional endpoint. Otherwise, the request will fail.
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