Data Analysis with Python - Pandas Creating Columns

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certificates_earned['Certificates per month'] = round(
    certificates_earned['Certificates'] /
    certificates_earned['Time (in months)'], 2

Referencing the above code, what is the number 2 in this code good for? and what is "round". good for? I may have missed something - please enlighten me, this would be a great help...

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Data Analysis with Python - Pandas Creating Columns

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Actually… this is what I forgot to consult… thank you for pointing this out, I did not search it in the first place, Thanks again for a great assistance…