# input as Number n=int(input('enter number:')) temp=n while(n!=0): rem=n%10 if rem!=0 and rem!=1: print(temp,'is not Binary Number') break n=n//10 else: print(temp,'is Binary Number') (OR) # input as String n=input('enter number:') lis=['1','0'] for i in n: if i not in lis: print(n,'is not Binary Number') break else: print(n,'is Binary Number')