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> >>How do I check if x can be represented as a float? For example, for
> >>64-bit integers and 64-bit floats, (1<<62)+5 cannot be represented
> >>as a float, but 1<<62 can.
> >print(x == math.tointeger(x+0.0))
> >
> What if x is a float?

print(x == (x+0.0))

If you need to distinguish integers from float, you can use math.type(x).

But please share why you need all this.