Return a dict from map function

Question

newb here, hello! I'm using map() function to iterate a list of Tickers (strings) through OHLCV download function with multiprocessing. As a result, I receive a list of dataframes.

All_coins_history = Shark_pool.map(refractor_get_history, Tickers)

As my dataframes with history have just Dataframe[["Open", "High", "Low", "Close", "Volume"]] format, there is no way for me to know which data from All_coins_history list is for which Ticker. What is the clean way to create, for example, a dictionary instead of list, where each dataframe would have its Ticker as a key?

Please add some example input and output data, as well as more code to clarify your question (e.g. what are Shark_pool, refactor_get_history, and Tickers?). Ideally your question should contain a minimal reproducible example. — 0x5453
– 0x5453, Commented Sep 7, 2021 at 21:21
Please provide enough code so others can better understand or reproduce the problem. — Community
– Community Bot, Commented Sep 13, 2021 at 7:41

Barmar · Accepted Answer · 2021-09-07 21:30:45Z

Use zip() to pair up the ticker symbols with the result of the mapping, then call dict() to create the dictionary.

all_coins_history = dict(zip(Tickers, Shark_pool.map(refractor_get_history, Tickers)))

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