Question

我的代码中包含了一切（我认为），除了我从字典中获取正确名称的部分。

我的代码是：

studentdirectory = {"Andrew": ["Jane", "John"], "Betsy": ["Ellen", "Nigel"], "Louise": ["Natalie", "Louis"], "Chad": ["Mary", "Joseph"]}

def menu():
    print
    print ("Enter 1 to retrieve the mother's name of the child.")
    print ("Enter 2 to retrieve the father's name of the child.")
    print ("Enter 3 to retrieve the name of both parents of the child.")
    print ("Enter 0 to quit.")
    print
    while True:
        choice = input("Enter your choice now: ")
        if (choice >= 0) and (choice<= 3) and (int(choice) == choice):
            return choice
        else:
            print ("Your choice is invalid. Please try again with options 0 to 3.")

for key in studentdirectory:
    mom = studentdirectory[key][0]
    dad = (studentdirectory[key][1])

def main():
    while True:
        choice = menu()
        if choice == 0:
            break
        else:
            name = raw_input("Enter the name of the child: ")
            if studentdirectory.has_key(name):
                if choice == 1:
                    print "The name of the child's mother is ", mom, "."
                elif choice == 2:
                    print "The name of the child's father is ", dad, "."
                else:
                    print "The name of the child's parents are ", mom, " and ", dad, "."
            else:
                print "The child is not in the student directory."


 main()

我想让我的代码尽可能接近这一点。我只需要帮助理解如何在字典中获得单独的值，因为现在对于每个妈妈和爸爸我只会让路易丝的父母回来。我该如何解决？？这是Python语言。

Answer 1

if studentdirectory.has_key(name):
    mom = studentdirectory[key][0]
    dad = (studentdirectory[key][1])

并删除for key in studentdirectory循环部分

因为当您在主循环中获得学生姓名时。您的原始代码仅返回const mom和dad变量，它来自for循环上方的main()循环定义。

逻辑上

您只能在之后获得姓名的父母姓名

Answer 2

您在循环中获取mom和dad的值，但每次都会覆盖它们，因此它们始终设置为最后一个循环周期的值（路易斯在你的情况下）。您只应在需要时定义它们：

def main():
    while True:
        choice = menu()
        if choice == 0:
            break
        else:
            name = raw_input("Enter the name of the child: ")
            if studentdirectory.has_key(name):  
                mom = studentdirectory[name][0]
                dad = studentdirectory[name][1]
                if choice == 1:
                    print "The name of the child's mother is ", mom, "."
                elif choice == 2:
                    print "The name of the child's father is ", dad, "."
                else:
                    print "The name of the child's parents are ", mom, " and ", dad, "."
            else:
                print "The child is not in the student directory."

我无法从字典中获取正确的值。有什么建议？

2 个答案: