[Python][CheckIO] Solve Ghosts age

莫名其妙一個簡單的題目寫了兩天於是紀念一下

 def is_fibonacci(num):  
   cur = 0  
   prev1 = 1  
   prev2 = 0  
   while cur < num:  
     cur = prev1 + prev2  
     prev2 = prev1  
     prev1 = cur  
   if num == cur:  
     return True  
   else:  
     return False  

 def checkio(opacity):  
   if opacity == 10000:  
     return 0  
   cur = 10000  
   last_fibonacci = 1  
   for yrs in range(1, 5000):  
     if is_fibonacci(yrs) == True:  
       if cur - yrs == opacity:  
         return yrs  
       else:  
         cur -= yrs  
         last_fibonacci = yrs  
     else:  
       if cur + 1 == opacity:  
         return yrs  
       else:  
         cur += 1