If you know the type. You should be able to detect it.
from decimal import Decimal
from fractions import Fraction
NUMBER = (int, float, complex, Decimal, Fraction)
def is_number(n):
if isinstance(n, NUMBER):
print(n, 'is a number')
else:
print(n, 'is not a number')
is_number(1)
is_number(1.2)
is_number(Decimal(2.02))
is_number(Fraction(2,3))
is_number(1j)
is_number('1')
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