Question

你可以告诉我这有什么不对吗？我一直在接受SyntaxErrors，我不知道为什么会发生这种情况，因为我对这门语言不熟悉并且从我的学校工作手册中得到的信息非常少。

score = int(input("What Score did you get?"))

if score <= 39 :
    print ("You might want to try a bit harder, you got a grade U.")
if score =>40 and <=49:
    print("Good, but you could try a little harder next time. You got a grade D")
if score =>50 and <= 59:
    print ("Good Job! You got a grade C")
if score =>60 and <= 69:
    print("Great! You got a grade B")
if score =>70:
    print ("Excellent! Thats a grade A!")

Answer 1

Python不是英文; and不会猜测您正在测试同一个变量。你必须拼写出来：

if score >= 40 and score <= 49:

或者你可以使用比较链：

if 40 <= score <= 49:

其中Python基本上会做同样的事情（它与(40 <= score) and (score <= 49)相同，但您不必重复score变量或再使用and。

但是，因为如果您使用if .. elif .. else分支的组合，只有一个测试匹配，您可以测试而更高的值，只需要测试每个分支中的一个边界：

if score >= 70:
    print("Excellent! Thats a grade A!")
elif score >= 60:
    print("Great! You got a grade B")
elif score >= 50:
    print("Good Job! You got a grade C")
elif score >= 40:
    print("Good, but you could try a little harder next time. You got a grade D")
else:
    print("You might want to try a bit harder, you got a grade U.")

请注意这与if个单独系列语句之间的区别;这些不是彼此相关的，而使用elif和else非常重要。

因此，如果分数为70或以上，则第一次测试匹配并跳过所有测试。如果得分仅为55，那么前两个测试不匹配，但第三个测试不匹配，因此跳过余数。

如果您更喜欢订购，那么请测试上限而不是下限：

if score < 40:
    print("You might want to try a bit harder, you got a grade U.")
elif score < 50:
    print("Good, but you could try a little harder next time. You got a grade D")
elif score < 60:
    print("Good Job! You got a grade C")
elif score < 70:
    print("Great! You got a grade B")
else:
    print("Excellent! Thats a grade A!")

Answer 2

您缺少三个分数：

if score ==40 and score <=49:

而不是

if score ==40 and <=49:

最终守则：

score = int(input("What Score did you get?"))
if score <= 39 :
    print ("You might want to try a bit harder, you got a grade U.")
if score ==40 and score<=49:
    print("Good, but you could try a little harder next time. You got a grade D")
if score >=50 and score<= 59:
    print ("Good Job! You got a grade C")
if score >=60 and score <= 69:
    print("Great! You got a grade B")
if score >=70:
    print ("Excellent! Thats a grade A!")

Answer 3

您的语法错误发生在这里。

if score ==40 and <=49:
    print("Good, but you could try a little harder next time. You got a grade D")
if score =>50 and <= 59:
    print ("Good Job! You got a grade C")
if score =>60 and <= 69:
    print("Great! You got a grade B")

Python的和语句结合了两个布尔语句，在您的情况下：

score =>60

<= 69

虽然第一个有效，但python无法识别第二个。我假设您正在比较两种情况下的得分变量，因此您可以通过在第二个布尔语句旁边添加得分来修复它，如下所示：

if score ==40 and score <=49:
    print("Good, but you could try a little harder next time. You got a grade D")
if score =>50 and score <= 59:
    print ("Good Job! You got a grade C")
if score =>60 and score <= 69:
    print("Great! You got a grade B")

python和获取语法错误的新手，任何人都可以帮助我吗？

3 个答案: