Identifying a complex number

>>> isinstance(1j, complex)
True

Try this:

if isinstance(x, complex):
    print("Error 05: Complex Root")

This prints error for 2 + 0j, 3j, but does not print anything for 2, 2.12 etc.

Also think about throwing an error (ValueError or TypeError) when the variable is complex.

I'm not 100% sure what you're asking, but if you want to check if a variable is of complex type you can use isinstance. For example,

x = 5j
if isinstance(x, complex):
    print 'X is complex'

prints

X is complex

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