how to connect other substrate chains?

[Yxiaoyang]

so sorry，i have a question, i want connect a substrate chain, but I only have the official types.json, i want know can it work in python？ or tell me, what should I do

please, thanks for much.

[arjanz]

Basically you will have to tell the libraries how to interprete the types present in the runtime.

Some pointers to help you:

1. Does your Substrate chain support MetadataV14? Then you need to upgrade this library to version 1.0.x and the types will be included and will most likely work out of the box
2. With a runtime using MetadataV13 or less you need to specify the types yourself in a certain format. See https://github.com/polkascan/py-substrate-interface#manually-set-required-properties. Determine your starting point, this will be type_registry_preset=development for vanilla Substrate. See ValueError(f'Unsupported type registry preset "{name}"') #122 (comment) for more info.
3. If you have a types.json you use for PolkadotJS, you will have to reformat that into this format: https://github.com/polkascan/py-scale-codec/blob/master/scalecodec/type_registry/test.json Another example, for Acala I converted the PolkadotJs types.json some time ago into https://gist.github.com/arjanz/b7290f68d5d94b83e7dd4e20e4f6ef3c

Hope this helps!

[Yxiaoyang]

hello，excuse me，do you have doc to reformat the "type.json"? or Can I provide you with the type.json file, can you help?

[Yxiaoyang]

sorry, i'm ok. thanks for much