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def fib_intervall(x):
    """returns the largest fibonacci
    number smaller than x and the lowest
    fibonacci number higher than x"""
    if x < 0:                               
        return -1
    (old,new, lub) = (0,1,0)
    while True:
        if new < x: 
            lub = new 
            (old,new) = (new,old+new) 
        else:
            return (lub, new) 

while True:
    x = int(input("Your number?: "))
    if x <= 0:
        break
    (lub,sup) = fib_intervall(x)
    print("Lagrest Fibonacci Number smaller than x: " + str(lub))
    print("Smallest Fibonacci Number larger than x: " + str(sup))
    

Code: Alles auswählen

def fib_intervall(x):
    """returns the largest fibonacci
   number smaller than x and the lowest
   fibonacci number higher than x"""
    if x < 0:
        raise ValueError('x must be >= 0')
    prev_fib = 0
    next_fib = 1
    while next_fib < x:
        prev_fib, next_fib = next_fib, next_fib + prev_fib
        print(prev_fib, next_fib)
    return prev_fib, next_fib