For the following code, what is the colon (:) means?
import pandas as pd
merge: pd.DataFrame = pd.concat([train, dftt, test])
submission: pd.DataFrame = test[['test_id']]
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Zero Piraeus
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william007
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4A type hint... you're hinting that `merge` should reference a DataFrame object. – cs95 Jan 27 '18 at 11:06
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This is [PEP-526](https://www.python.org/dev/peps/pep-0526/). – L3viathan Jan 27 '18 at 11:41
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1Not that I would know, what type hint means. But since I looked it up, I leave [this SO thread as a link](https://stackoverflow.com/a/32558710/8881141). – Mr. T Jan 27 '18 at 11:42