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Synsets in Wordnet for NLTK

I am using this code to get all synonyms from the text in document named "answer_tokens.txt" it is only listing the words in the document without the synonyms. can someone check it out?
from nltk.corpus import wordnet
with open('answer_tokens.txt') as a: #opening the tokenised answer file
        wn_tokens = (a.read())
        #printing the answer tokens word by word as opened
        print('==========================================')
        synonyms = []
        for b in word_tokenize(wn_tokens):
                print (str (b))
        
for syn in wordnet.synsets (b):
                        for l in syn.lemmas(b):
                                synonyms.append(l.name())