Python循环[Module]

Question

我是Python编程语言的新手。如果确切的话，这是我的第一天。 我正在制作一个终端，这个代码在这里可见：Pastebin link 我不想从这里（/ ###）到这里（### /）的代码循环。

/### 
lastcommand = input("C-Gen@H//Vilius #OpDesc: ")
if lastcommand == "info":
    print (info)
elif lastcommand == "list1":
    print (list1)
elif lastcommand == "list2":
    print (list2)
elif lastcommand == "list3":
    print (list3)
elif lastcommand == "session_name":
    print (session_name)
elif lastcommand == "myName":
    print (myName)
elif lastcommand == "currentloc":
    print (currentloc)
elif lastcommand == "currentfold":
    print (currentfold)
elif lastcommand == "filenameloc":
    print (filenameloc)
elif lastcommand == "cpu":
    print (cpu)
else:
    print ("Error: incorrect command (" + lastcommand + ")")
###/

Answer 1

如果您希望它永远循环，您可以使用while True，如下所示：

while True:
    lastcommand = input("C-Gen@H//Vilius #OpDesc: ")
    if lastcommand == "info":
        print (info)
    elif lastcommand == "list1":
        print (list1)
    elif lastcommand == "list2":
        print (list2)
    elif lastcommand == "list3":
        print (list3)
    elif lastcommand == "session_name":
        print (session_name)
    elif lastcommand == "myName":
        print (myName)
    elif lastcommand == "currentloc":
        print (currentloc)
    elif lastcommand == "currentfold":
        print (currentfold)
    elif lastcommand == "filenameloc":
        print (filenameloc)
    elif lastcommand == "cpu":
        print (cpu)
    else:
        print ("Error: incorrect command (" + lastcommand + ")")

while将循环，直到提供的条件评估为False。但是在这里你给它True，它永远不会是假的，所以它将永远循环，直到Python在某处看到break语句。

但是，您可以使用字典使代码更简单。试试这个：

info_dict = {}
info_dict["info"] = info
info_dict["list1"] = list1
# ... and do that with the rest of it.
while True:
    lastcommand = input("C-Gen@H//Vilius #OpDesc: ")
    try:
        print info_dict[lastcommand]
    except KeyError:
        print ("Error: incorrect command (" + lastcommand + ")")

然后你没有那些可怕的elif，你可以使用输入的字符串直接访问变量。