Question

我有两个功能。请参阅以下功能;

 def check_channel_number(self):

    print "***************Channel Checker *********************" 

    print ''

    user_channel_number = int(re.sub('\D', '', raw_input("Enter a channel number, (3digit): "))[:3]);

    channel = ("channelNr= '%d'") % (user_channel_number)

    print channel

    # channel_search = channel + str(user_channel_number)

    datafile = file('output.txt')

    found = False

    for line in datafile:

        if channel in line:

            found = True 
            print 'The channel number you entered is correct and will be deleted'
            return user_channel_number

    print 'The channel number you entered is not on the planner'
    return False

只想在以下函数中使用（user_channel_number）的返回值。

   def delete_events(self):



    if user_channel_number == True:

        return 'The program number is correct and will be deleted'

        # action = 'DeleteEvent'
        menu_action = 'all'
        book = 'RECYC:687869882'
        arg_list = [('C:\\Users\\yke01\\Documents\\StormTest\\Scripts\\Completed'
                        '\\Utils\\UPNP_Client_Cmd_Line.py')]
        arg_list.append(' --action=')
        arg_list.append(action)
        arg_list.append(' --ip=')
        arg_list.append('10.10.8.89')
        arg_list.append(' --objectId=')
        arg_list.append(book)

        subprocess.call(["python", arg_list])

        print 'The program deleted successfully'

当我运行我的脚本时，它说全局没有定义user_channel_number？如何在user_channel_number函数中调用delete_events()？

Answer 1

在函数内部定义变量时，它是一个局部变量，这意味着它只能在该函数中访问。

在课堂内

看起来你在一个类中，所以你可以通过这样定义它来使变量可以被类中的所有方法访问：

def check_channel_number(self):

    self.user_channel_number = ...

然后在第二个函数中，您可以像下面这样使用它：

def delete_events(self):

    if self.user_channel_number:

课外

如果您没有在课程中使用方法，则可以使用global内置语言。

例如，

def check_channel_number():

    global user_channel_number 
    user_channel_number = ...

def delete_events():

    if user_channel_number:

        ...

使用函数返回的值

相反，在第一个函数check_channel_number()中，您可以让它返回user_channel_number。然后，您可以在delete_events()内调用该函数，如下所示：

def check_channel_number():

    user_channel_number = ...
    return user_channel_number

def delete_events():

    if check_channel_number():

        ...

Answer 2

函数无法共享其局部变量。您可以从第一个返回值并将其传递给第二个：

def check_channel_number(self):
    ...
    return user_channel_number

def delete_events(self):
    user_channel_number = self.check_channel_number()
    ...

或者在对象上保存价值：

def check_channel_number(self):
    ...
    self.user_channel_number = user_channel_number
    ...

def delete_events(self):
    if self.user_channel_number:
         ....

Answer 3

所以我认为当你调用check_channel_number函数时，user_channel_number被定义在那里，所以当你调用delete_events时，它已经超出了范围，也许这样会有所帮助？

user_channel_number = check_channel_number()
delete_events()

我可能也有user_channel_number作为删除函数的输入，所以它会变成这样:(其中ucn是user_channel_number）

def delete_events(self, ucn):
    if ucn == True:
        print 'The program number is correct and will be deleted'

        # action = 'DeleteEvent'
        menu_action = 'all'
        book = 'RECYC:687869882'
        arg_list = [('C:\\Users\\yke01\\Documents\\StormTest\\Scripts\\Completed'
                    '\\Utils\\UPNP_Client_Cmd_Line.py')]
        arg_list.append(' --action=')
        arg_list.append(action)
        arg_list.append(' --ip=')
        arg_list.append('10.10.8.89')
        arg_list.append(' --objectId=')
        arg_list.append(book)

        subprocess.call(["python", arg_list])

        print 'The program deleted successfully'

我也改变了`return'程序编号是正确的，将被删除''到print语句，因为我觉得返回将在其他代码行运行之前结束该函数

所以代码可能最终会像：

user_channel_number = check_channel_number()
delete_events(user_channel_number)

编辑：

注意到你的函数看起来像是一个类的一部分，

在这种情况下，您可以这样做：

self.ucn = self.check_channel_number()
self.delete_events(self.ucn)

（或者如果您不想将user_channel_number传递给该功能，您可以将if user_channel_number:更改为if self. user_channel_number:

在另一个函数中使用返回值

3 个答案: