Python program for Fibonacci numbers

a=0
b=1
n=int(input ("Enter No. Of fibonacci to be generated :"))
if n<=0:
        Print ("not possible")
elif n==1
     print (a)
elif n>=2:
     print ("{ } , { } " . format (a,b) , end=' ' )
     for i in range (2,n) :
           c=a+b
           print (" , { } ". format (c), end=' ' )
           a=b
           b=c

