python pandas : decimal point after integer? -

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i'm going through pandas tutorial, , came across haven't seen before. there decimal point after integer.

here's gist link tutorial: https://gist.github.com/findjashua/82717d2f3261a92ce528

what purpose of decimal point after integer?.

i think makes float instead of int shown below:

in [1]: type(5) out[1]: int  in [2]: type(5.) out[2]: float

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