Question

每次运行此代码时都会出现语法错误。我不明白为什么我的脚本中的其他地方，我使用相同的结构，它工作正常。

我首先得到elif region == 2：line的语法错误。然后，我得到一堆缩进错误。我一直玩弄缩进没有用。希望有人能发现问题。

提前致谢。

def main():

back2main = "y"

while back2main == "y":

    print("Main Menu");print("1.)Highest Rainfall in one Day");print("2.)Wettest Location in Ireland");print("3.)Average Monthly Raindays");print("4.)[Construct Unique Query]");print("5.)Exit")
    choice = input("Please select one of options 1:5 above:")

    if choice == 1:

        print("1.)Cork");print("2.)Belfast");print("3.)Dublin");print("4.)Galway");print("5.)Limerick")
        region = input("Please enter a city from the numbered list above:")

        if region == 1:

            corkRain = open("CorkRainfall.txt","r")

            highestRain = 0.0

            for line in corkRain:
                data = line.split(" ")
                if float(data[3]) > highestRain:
                    highestRain = float(data[3])

        print("Highest rainfall in a single day for Cork: " + str(highestRain) + " mm")

        corkRain.close()

        back2main = raw_input("Return to Main Menu? (y/n):")

        elif region == 2:

            belfastRain = open("BelfastRainfall.txt","r")

            highestRain = 0.0

            for line in belfastRain:
                data = line.split(" ")
                if float(data[3]) > highestRain:
                    highestRain = float(data[3])

        print("Highest rainfall in a single day in Belfast: ") + str(highestRain)

Answer 1

elif块必须与其上方的if块垂直位于同一位置。这意味着elif下的所有代码（包括elif）都应该向左移动一个标签。

Answer 2

你的问题在这里：

print("Highest rainfall in a single day for Cork: " + str(highestRain) + " mm")
corkRain.close()
back2main = raw_input("Return to Main Menu? (y/n):")

如果你希望它们位于第一个if下，那么这些行应该是一个缩进的级别。

执行被解释为超出之前的范围，下一个是＆＃34;如果＆＃34;而不是＆＃34; elif＆＃34;或者如果你想要属于上一个，如果它应该是一个缩进权。

Answer 3

我建议尝试这个：

def main():

    back2main = "y"

    while back2main == "y":

        print("Main Menu\n1.)Highest Rainfall in one Day\n2.)Wettest Location in Ireland\n3.)Average Monthly Raindays\n4.)[Construct Unique Query]\n5.)Exit")
        choice = input("Please select one of options 1:5 above:")

        if choice == 1:

            print("1.)Cork\n2.)Belfast\n3.)Dublin\n4.)Galway\n5.)Limerick")
            region = input("Please enter a city from the numbered list above:")

            if region == 1:

                corkRain = open("CorkRainfall.txt","r")

                highestRain = 0.0

                for line in corkRain:
                    data = line.split(" ")
                    if float(data[3]) > highestRain:
                        highestRain = float(data[3])



            elif region == 2:

                belfastRain = open("BelfastRainfall.txt","r")

                highestRain = 0.0

                for line in belfastRain:
                    data = line.split(" ")
                    if float(data[3]) > highestRain:
                        highestRain = float(data[3])

            print("Highest rainfall in a single day for Cork: " + str(highestRain) + " mm")

            corkRain.close()

            back2main = raw_input("Return to Main Menu? (y/n):")

            print("Highest rainfall in a single day in Belfast: ") + str(highestRain)

您可以使用新的换行符（\ n）替换多个print语句，并且需要缩进第一行下面的所有代码。此外，由于线条，elif正在破碎：

print("highest rainfall...
corkRain.close()
back 2main = ...

Python中elif语句的语法错误......？

3 个答案: