Question

这是我的代码

# Start of functions
# The menu is called exclusively from the main program code
def menu():
    print "Please choose an option."
    print "1 = User name"
    print "2 = Factorial"
    print "3 = Quit"
    choice=int(raw_input(":"))

    # Stars to validate options
    while choice <1 or choice >3 :
        print "Invalid menu choice"
        print "Please choose an option."
        print "1 = User name"
        print "2 = Factorial"
        print "3 = Quit"
        choice=int(raw_input(":"))
    else:
        return choice

def get_initial(name):
    # Will remove all letters after the first one in name to get initial
    name=name[:1]
    return name

def get_last_name(name):
    # -1 counts backwards from the end of string and splits off first word
    name = str(name.split()[-1])
    return name

# Function will produce and give username based off of the full name that was input
def print_username():
    full_name = str(raw_input("What is your name?: "))
    initial = get_initial(full_name)
    last_name = get_last_name(full_name)
    username = str(initial) + str(last_name)
    # Converts 'username' to lowercase and stores
    username = username.lower()
    print username
    print menu()

# Takes factorial and multiplies it by the number the preceeds it down to 0
def print_factorial():
    number = int(raw_input("Enter a number: "))
    factorial = 1
    counter = number
    while counter > 0:
        factorial=factorial*counter
        print counter,
        if counter > 1:
            print'*',
        counter=counter-1
    print '=', factorial
    print menu()


# Start of main program
# Result of menu used to create global variable
choice = menu()

while choice != 3:
    if choice == 1:
        print print_username()
    elif choice == 2:
        print print_factorial()
    else:
        choice = menu()
        break

我的问题是，一旦我做了阶乘或用户名，我需要它来允许我访问菜单并访问并执行用户名，阶乘或退出功能。但它并没有这样做。

Answer 1

您的print_username和print_factorial功能只能打印 menu()返回值。他们没有做这些事。在您的顶级while循环中，如果现有 menu()既不是1也不是2，而是choice循环，则只会再次调用while如果之前选择了3，则退出。

相反，请每次通过menu循环调用while：

# Start of main program
# Result of menu used to create global variable
while True:
    choice = menu()
    if choice == 1:
        print_username()
    elif choice == 2:
        print_factorial()
    else:
        break

并从print menu()和print_username()函数中移除print_factorial()行。

以上循环是无穷无尽的（while True:），但如果menu()返回1或2以外的任何内容，则会发出break语句，循环退出。此时你的课程也会结束。

用python运行后访问其他功能？

1 个答案: