令人困惑的名稱錯誤

我有一個問題。我在下面運行這個程序，我得到了這個不尋常的錯誤，說'名字'的意思是沒有定義。這裏是錯誤：令人困惑的名稱錯誤

Traceback (most recent call last): 
    File "C:/Python32/Computer science stuff/PracticeTest 175-183.py", line 45, in <module> 
    main() 
    File "C:/Python32/Computer science stuff/PracticeTest 175-183.py", line 44, in main 
    displaySummary() 
    File "C:/Python32/Computer science stuff/PracticeTest 175-183.py", line 23, in displaySummary 
    print("List's mean: " + str(mean)) 
NameError: global name 'mean' is not defined

這是代碼。我的錯誤是什麼？

""" 
Programmer: Bertrand Zhu 
""" 

#Defining needed functions 
def askName(myName): 
    myName = myName.upper() 
    return myName 

def calculateMean(a, b, c, d, e): 
    sumNum = a + b + c + d + e 
    mean = round(sumNum, 2) 
    return mean 

def displaySummary(): 
    a = int(input("Input your first number please: ")) 
    b = int(input("Input your second number please: ")) 
    c = int(input("Input your third number please: ")) 
    d = int(input("Input your fourth number please: ")) 
    e = int(input("Input your fifth number please: ")) 
    calculateMean(a, b, c, d, e) 
    print("The values used: " + str(a) + " " + str(b) + " " + str(c) + " " +  str(d) + " " + str(e)) 
    print("List's mean: " + str(mean)) 
    print() 
    print() 

def programmerID(): 
    print() 
    print() 
    print("Programmer: THIS INFORMATION IS CLASSIFIED") 
    print("Roster #: 20") 
    print("Period: 7") 
    print() 
    print() 

def main(): 
    while True: 
     programmerID() 
     georgiePorgie = input("Enter your name: ") 
     if georgiePorgie.upper() == "QUIT": 
      break 
     else: 
      askName(georgiePorgie) 
      displaySummary() 
main() 
print("Goodbye, " + myName)

來源

2016-04-23 bertrand

'打印（「列出的意思是：」 + STR（平均））'的意思是不是在該行定義。變量作用域限於函數'calculateMean'，從它的外部，程序「不知道」該變量。 – Delgan

嘗試'mean = calculateMean（a，b，c，d，e）' – SparkAndShine

'mean'是'displaySummary'中的一個自由變量。你可能打算把它綁定到某個東西上。 –

分配calculateMean()功能的mean 「本地」變量的結果：

來源

2016-04-23 20:12:59 alecxe

非常感謝您找出問題所在 – bertrand

令人困惑的名稱錯誤

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