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You could just check that
type(x) == float
Or, instead of round, you could use python's string formatter.
"{:.5g}".format(x)
will format x using 5 digits of precision (including before and after the decimal separator), removing trailing zeroes and the decimal dot for integers. Not exactly equivalent to your code, but maybe it will be good enough for your use.
If you have a locale configured for French/Italian/whatever notation
"{:.5n}".format(x)
will automatically put a comma instead of a dot for you.
