由于Python没有switch语句,我应该使用什么?
可能重复:
python中switch语句的替代?
我在Python中制作了一个基于控制台的应用程序,我想使用一个Switch语句来处理用户选择菜单选项。
你的兽医建议我用什么。 谢谢!
调度表,或者说是字典。
你也可以映射钥匙。 菜单选择的值到执行所述选择的功能:
def AddRecordHandler():
print("added")
def DeleteRecordHandler():
print("deleted")
def CreateDatabaseHandler():
print("done")
def FlushToDiskHandler():
print("i feel flushed")
def SearchHandler():
print("not found")
def CleanupAndQuit():
print("byez")
menuchoices = {'a':AddRecordHandler, 'd':DeleteRecordHandler, 'c':CreateDatabaseHandler, 'f':FlushToDiskHandler, 's':SearchHandler, 'q':CleanupAndQuit}
ret = menuchoices[input()]()
if ret is None:
print("Something went wrong! Call the police!")
menuchoices['q']()
记得验证你的输入! :)
有两种选择,第一种是if ... elif ...
链的标准。 另一个是字典映射到可调用选择(功能是一个子集)。 取决于你在做什么,哪一个是更好的主意。
elif链
selection = get_input()
if selection == 'option1':
handle_option1()
elif selection == 'option2':
handle_option2()
elif selection == 'option3':
some = code + that
[does(something) for something in range(0, 3)]
else:
I_dont_understand_you()
字典:
# Somewhere in your program setup...
def handle_option3():
some = code + that
[does(something) for something in range(0, 3)]
seldict = {
'option1': handle_option1,
'option2': handle_option2,
'option3': handle_option3
}
# later on
selection = get_input()
callable = seldict.get(selection)
if callable is None:
I_dont_understand_you()
else:
callable()
使用字典将输入映射到函数。
switchdict = { "inputA":AHandler, "inputB":BHandler}
处理程序可以是任何可调用的。 然后你就像这样使用它:
switchdict[input]()
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