Checking whether a variable is an integer or not [duplicate]

Answer 1

Here's a summary of the different methods mentioned here:

• int(x) == x
• try x = operator.index(x)
• isinstance(x, int)
• isinstance(x, numbers.Integral)

and here's how they apply to a variety of numerical types that have integer value:

You can see they aren't 100% consistent. Fraction and Rational are conceptually the same, but one supplies a .index() method and the other doesn't. Complex types don't like to convert to int even if the real part is integral and imaginary part is 0.

(np.int8|16|32|64(5) means that np.int8(5), np.int32(5), etc. all behave identically)