如何讓while循環指定一個變量？

Question

def valid(): 
    while True: 
     hiOrLo = input("Type 'h' for higher and 'l' for lower.") 
     if hiOrLo == "h" or hiOrLo == "l": 
      return 
     else: 
      print("Invalid, try again") 

hiOrLo = 0 
valid() 

print(hiOrLo) 

我的理解是，Python不會在while循環中通過「輸入」來更改變量，所以打印時hiOrLo仍然是「0」，但我需要hiOrLo或者是「h」或「 l「，無論選擇哪一個，我該怎麼做，同時保持它的功能？

Answer 1

具備的功能返回該值，則參考保存到它。

def valid(): 
    while True: 
     hiOrLo = input("Type 'h' for higher and 'l' for lower.") 
     if hiOrLo == "h" or hiOrLo == "l": 
      return hiOrLo 
     else: 
      print("Invalid, try again") 

hiOrLo = valid() 

print(hiOrLo) 

Answer 2

需要全球關鍵字：

def valid(): 
    global hiOrLo 
    while True: 
     hiOrLo = input("Type 'h' for higher and 'l' for lower.") 
     if hiOrLo == "h" or hiOrLo == "l": 
      return 
     else: 
      print("Invalid, try again") 

hiOrLo = 0 
valid() 

print(hiOrLo)