Python isdigit

a1 = '123'
print(type(a1))
a1a = 123
print(type(a1a))
print(a1.isdigit())

a2 = '123a'
print(a2.isdigit())

a3 = "\u0031"
print(a3)
print(a3.isdigit())

a4 = "\u0031\u00B2"
print(a4)
print(a4.isdigit())