I can help you solve the problem you encountered when using Solana’s “MemFilter” in MemCMP. The error message indicates that the attribute with the name “offset” is missing. Here is a step-by-step guide to solving this problem:

Understanding Context

MemCMP typically uses the following options:

• MemcmpOpts: Options for MemCMP requests.

• DataSliceOpts: Options for comparing data slices.

When starting the MemFilter request, it is necessary to specify the keys and offset (or part) for data filtering. The offset is used to determine which memory fragments should be compared.

Possible causes of error

• Incorrect key structure: Make sure the keys are in the correct format for MemCMP. Keys must be tuples or lists containing “address” and a reference to either “public key”, “index”, or another value.

• No offset

  : Be sure to specify the offset when completing the request. If no offset is specified, Solana defaults to 0.

• Invalid section comparison: Check the correctness of the comparisons. faithful In MemCMP, slices can be compared using various operators (for example, ==, !=, <, >, etc.).

Troubleshooting

• Check your key structure: Check your keys and make sure they meet MemCMP requirements. You can use tools like solana-key-utils or print the keys to check their format.

• Specify an offset (if necessary): If you use a specific section comparison operator, be sure to specify an offset as required by that operator. For example, if you compare slices based on their addresses, you need to specify the offset key in your structure. MemcmpOpts.

• Check Section Comparison: Double check your comparisons. to make sure they are true. You can use tools like solana-key-utils or print the keys to check their format and correctness.

Example Code

Python

from solana.rpc.types import MemcmpOpts, DataSliceOpts

Create an example key tuple with an offset of 0

key = (“my_key”, {“address”: “my_public_key”, “index”: 1})

Create MemcmpOpts structure with key and offset

opts = MemcmpOpts(

key=key

slice=”data_slice”,

operator=”==””,

Example comparison operator

)

Execute the MemFilter request

result = expectation mem_filter(opt.)

“

In this example, we create an instance of thekeytuple with an offset of 0. We then defineoptsas a structure containing the key and slice parameters. Finally, we execute the MemFilter request using themem_filter()` function.

Hope this helps you solve the problem! If you have additional questions or need additional help, do not hesitate to contact us.

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