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future_to_url = {executor.submit(getHotelURLs, url): url for url in cityURLs}

The above code is from an concurrent.futures example in https://docs.python.org/3/library/concurrent.futures.html

It seems to me that a for loop is used in a dictionary. I am wondering if there is a documentation about this?

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This is dict comprehensions. You should view the doc of list comprehensions (it works similar to dict comprehension)

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