bip39 checksum python
Clone/download this code from Trezor (don't forget the word list).

Then check your word-list like this:

from mnemonic import Mnemonic

code = "word1 word2 [...] word23 word24"
mnemo = Mnemonic("english")
isValid = mnemo.check(code) # returns a boolean
print('Checksum is valid: ' + str(isValid))