This is a fibonnaci sequence generator, the colon causes a syntax error #set variables num_1 = 1 num_2 = 2 count = 0 terms = int(input("How many terms of the fibonnaci sequence would you like?") #function while terms != count : num_3 =num_1+num_2 print (num_3) num_1=num_2 num_2 = num_3 count=count+1 else: print ("finished")