“UnboundLocalError：賦值前引用了局部變量‘score’”

Question

每次我運行我的程序時，我都會在回答第一個問題后收到該消息。 我不明白為什么會一直發生這種情況，因為我在一切之前都創建了 score 變量，我不明白為什么會出現問題。 我該如何解決這個問題？ 這是我的代碼：

score = 0

name = input("Before we start, what would you like me to call you? : ")

def greeting():
    print ("Welcome to your Math review quiz,",name)
    print("You will have to answer 5 questions")

def quiz1():
    q1 = int (input("5 + 5 : "))
    if q1 == 10:
        print("Correct")
        score = score + 1
    else :
        print ("Incorrect")
    q2 = int (input ("5 + 10 : "))
    if q2 == 15 :
        print("Correct")
        score = score + 1
    else :
        print("Incorrect")
    q3 = int (input ("50 + 10 : "))
    if q3 == 60 :
        print("Correct")
        score = score + 1
    else :
        print("Incorrect")

    q4 = int (input ("50 + 50 : "))
    if q4 == 100 :
        print("Correct")
        score = score + 1
    else :
        print("Incorrect")

greeting()
quiz1()

Answer 1

變量score的 scope 不在quiz1中。 因此，我會將其傳入，並根據需要返回：

score = 0

name = input("Before we start, what would you like me to call you? : ")

def greeting():
    print ("Welcome to your Math review quiz,",name)
    print("You will have to answer 5 questions")

def quiz1(score):
    q1 = int (input("5 + 5 : "))
    if q1 == 10:
        print("Correct")
        score = score + 1
    else :
        print ("Incorrect")
    q2 = int (input ("5 + 10 : "))
    if q2 == 15 :
        print("Correct")
        score = score + 1
    else :
        print("Incorrect")
    q3 = int (input ("50 + 10 : "))
    if q3 == 60 :
        print("Correct")
        score = score + 1
    else :
        print("Incorrect")

    q4 = int (input ("50 + 50 : "))
    if q4 == 100 :
        print("Correct")
        score = score + 1
    else :
        print("Incorrect")
    return score

greeting()
score = quiz1(score)

Answer 2

當您在 function 定義（方法除外）中引用變量時，python 指的是本地可驗證的。 您可以使用global關鍵字將score編輯為全局變量。

score = 0

name = input("Before we start, what would you like me to call you? : ")

def greeting():
    print ("Welcome to your Math review quiz,",name)
    print("You will have to answer 5 questions")

def quiz1():
    global score # add this line #
    q1 = int (input("5 + 5 : "))
    if q1 == 10:
        print("Correct")
        score = score + 1
    else :
        print ("Incorrect")
    q2 = int (input ("5 + 10 : "))
    if q2 == 15 :
        print("Correct")
        score = score + 1
    else :
        print("Incorrect")
    q3 = int (input ("50 + 10 : "))
    if q3 == 60 :
        print("Correct")
        score = score + 1
    else :
        print("Incorrect")

    q4 = int (input ("50 + 50 : "))
    if q4 == 100 :
        print("Correct")
        score = score + 1
    else :
        print("Incorrect")

greeting()
quiz1()

Answer 3

make score global，在 function 的第一行添加global score 。

Answer 4

這可能會有所幫助

name = input("Before we start, what would you like me to call you? : ")

def greeting():
    print ("Welcome to your Math review quiz,",name)
    print("You will have to answer 5 questions")

def quiz1():
    score = 0
    q1 = int (input("5 + 5 : "))
    if q1 == 10:
        print("Correct")
        score = score + 1
    else :
        print ("Incorrect")
    q2 = int (input ("5 + 10 : "))
    if q2 == 15 :
        print("Correct")
        score = score + 1
    else :
        print("Incorrect")
    q3 = int (input ("50 + 10 : "))
    if q3 == 60 :
        print("Correct")
        score = score + 1
    else :
        print("Incorrect")

    q4 = int (input ("50 + 50 : "))
    if q4 == 100 :
        print("Correct")
        score = score + 1
    else :
        print("Incorrect")

greeting()
quiz1()