Python打印函数输出多次

Python printing function output multiple times

我正在编写一个程序来完成 certain python challenge。我创建了这个程序,它基本上完成了我需要它做的所有事情,除了它有一个奇怪的怪癖;它多次打印我想要的输出。

cmdname = input("Enter the name of your command.\n>")
print("Enter options one by one. If the option has an argument, put a * at the end of the option. When done entering options, enter \"q\".")
oplist = ""
oplist += cmdname + " " 
def prgm(): 
    global oplist
    while 2 + 2 == 4:
        user = input(">")
        if user[0] == "-":
            if "*" in user:
                oplist += user[0:len(user) - 1] + " " 
                print("Now, enter the option's argument.")
                user = input(">")
                oplist += user[0:len(user) - 1] + " " 
                print("Option successfully added.")
                prgm()
            else: 
                oplist += user + " " 
                print("Option successfully added.")
                prgm()
        elif user == "q":
            print("Enter the command argument.")
            user = input(">")
            oplist += user
        else:
            print("Error. You didn't enter an option.")
            prgm()
        break
    print(oplist)
prgm()

打印输出的次数似乎取决于用户指定的选项数量,但我不知道为什么。此外,当 运行 程序处于 IDLE 时,如果我在函数完成后手动打印(oplist),IDLE 会在一行上打印一次输出,就像我打算的那样。为什么会这样?

print(oplist)移到函数外,到程序的最后一行。由于您使用递归,此行被调用多次。