[Python] Creating a dictionary in Python and using it to translate a word

I have created a Spanish-English dictionary in Python and I have stored it using the variable translation. I want to use that variable in order to translate a text from Spanish into English. This is the code I have used so far:

from corpus.nltk import swadesh
import my_books

es2en = swadesh.entries(['es', 'en'])
translation = dict(es2en)

for sentence in my_books.sents("book_1"):
for word in my_books.words("book_1"):
if word in es2en:
print(translation, end= " ")
else:
print("unknown_word", end= " ")
print("")


My problem is that none of the words in book_1 is actually translated into English, so I get a text full of unknown word. I think I'm probably using translation in the wrong way... how could I achieve my desired result?

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