DynamoDB / Client / exceptions / ConditionalCheckFailedException

ConditionalCheckFailedException

class DynamoDB.Client.exceptions.ConditionalCheckFailedException

A condition specified in the operation could not be evaluated.

Example

try:
  ...
except client.exceptions.ConditionalCheckFailedException as e:
  print(e.response)

response

The parsed error response. All exceptions have a top level Error key that provides normalized access to common exception atrributes. All other keys are specific to this service or exception class.

Syntax

{
    'message': 'string',
    'Item': {
        'string': {
            'S': 'string',
            'N': 'string',
            'B': b'bytes',
            'SS': [
                'string',
            ],
            'NS': [
                'string',
            ],
            'BS': [
                b'bytes',
            ],
            'M': {
                'string': {'... recursive ...'}
            },
            'L': [
                {'... recursive ...'},
            ],
            'NULL': True|False,
            'BOOL': True|False
        }
    },
    'Error': {
        'Code': 'string',
        'Message': 'string'
    }
}

Structure

• (dict) –

  A condition specified in the operation could not be evaluated.

  • message (string) –

    The conditional request failed.

  • Item (dict) –

    Item which caused the ConditionalCheckFailedException.

    • (string) –

      • (dict) –

        Represents the data for an attribute.

        Each attribute value is described as a name-value pair. The name is the data type, and the value is the data itself.

        For more information, see Data Types in the Amazon DynamoDB Developer Guide.

        • S (string) –

          An attribute of type String. For example:

          "S": "Hello"

        • N (string) –

          An attribute of type Number. For example:

          "N": "123.45"

          Numbers are sent across the network to DynamoDB as strings, to maximize compatibility across languages and libraries. However, DynamoDB treats them as number type attributes for mathematical operations.

        • B (bytes) –

          An attribute of type Binary. For example:

          "B": "dGhpcyB0ZXh0IGlzIGJhc2U2NC1lbmNvZGVk"

        • SS (list) –

          An attribute of type String Set. For example:

          "SS": ["Giraffe", "Hippo" ,"Zebra"]

          • (string) –

        • NS (list) –

          An attribute of type Number Set. For example:

          "NS": ["42.2", "-19", "7.5", "3.14"]

          Numbers are sent across the network to DynamoDB as strings, to maximize compatibility across languages and libraries. However, DynamoDB treats them as number type attributes for mathematical operations.

          • (string) –

        • BS (list) –

          An attribute of type Binary Set. For example:

          "BS": ["U3Vubnk=", "UmFpbnk=", "U25vd3k="]

          • (bytes) –

        • M (dict) –

          An attribute of type Map. For example:

          "M": {"Name": {"S": "Joe"}, "Age": {"N": "35"}}

          • (string) –

            • (dict) –

              Represents the data for an attribute.

              Each attribute value is described as a name-value pair. The name is the data type, and the value is the data itself.

              For more information, see Data Types in the Amazon DynamoDB Developer Guide.

        • L (list) –

          An attribute of type List. For example:

          "L": [ {"S": "Cookies"} , {"S": "Coffee"}, {"N": "3.14159"}]

          • (dict) –

            Represents the data for an attribute.

            Each attribute value is described as a name-value pair. The name is the data type, and the value is the data itself.

            For more information, see Data Types in the Amazon DynamoDB Developer Guide.

        • NULL (boolean) –

          An attribute of type Null. For example:

          "NULL": true

        • BOOL (boolean) –

          An attribute of type Boolean. For example:

          "BOOL": true

  • Error (dict) – Normalized access to common exception attributes.

    • Code (string) – An identifier specifying the exception type.

    • Message (string) – A descriptive message explaining why the exception occured.