Quote from: Sanka555 on Today at 10:10:41 AM

thank you. this is the perfect choice for me. Here is the problem with the implementation.
I generate BIP39

Why exactly are you trying to use a BIP39 seed phrase as an Electrum seed phrase? You are adding unnecessary confusion. Electrum checks that any seed phrases it generates aren't accidentally also valid BIP39 seed phrases, and discards them if they are.

Quote from: Sanka555 on Today at 10:10:41 AM

need to do
normalized = prepare_seed(seed_phrase)

Quote

The normalization function (prepare_seed) removes all but one space between words.

what space to leave is not written anywhere (

The normalize function is defined here: https://github.com/spesmilo/electrum/blob/6650e6bbae12a79e12667857ee039f1b1f30c7e3/electrum/mnemonic.py#L79