Confusing Name Fehler

Question

Ich habe eine Frage. Ich habe dieses Programm unten ausgeführt und ich habe diesen ungewöhnlichen Fehler, der besagt, dass der Name "mean" nicht definiert ist. Hier ist der Fehler:

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 

Hier ist der Code. Was ist mein Fehler?

""" 
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) 

Answer 1

Weisen Sie das Ergebnis der calculateMean() Funktion zum mean "lokale" Variable: