Question

import pickle

class TasksError(Exception):
    def __init__(self, value):
        self.value = value
    def __str__(self):
        return repr(self.value)

class Task(object):
    def __init__(self, task = () ):
        if task ==():
            raise TasksError( Empty task. )
        self.name = task[0]
        self.date = task[1]
        self.priority = task[2]
        self.time = task[3]
        self.type = task[4]
        self.comment = task[5]

    def __str__(self):
        output =    Name: %s
Date: %s
Priority: %s
Time: %s
Type: %s
Comment: %s
    % ( self.name,
        self.date,
        self.priority,
        self.time,
        self.type,
        self.comment)
        return output

class Tasks(object):
    def __init__(self, container = []):
        self.container = [ Task(todo) for todo in container ]




    def delete(self):

        x = 0
        for todo in self.container:

             x = x + 1
             print "Task Number",x,"
", todo
             delete = raw_input("what number task would you like to delete")
             if delete == "y":
                 del todo


        ############
        #x = 0
       # for task in self.container:
           # x = x+1
           #print "Task Number",x,"
", task
            #delete = raw_input("what number task would you like to delete")
            #if delete == "y":
                #del(task)







    def add(self, task):
        if task ==   :
            raise TasksError( Empty task )
        self.container.append( Task(task) )






    def __str__(self):
        output =  
 .join( [ str(todo) for todo in self.container ] )
        return output

if __name__== "__main__":
    divider =  -  * 30 +  
 



    tasks = Tasks( container = [] ) # creates a new, empty task list

    while True:
        print divider,    Make your selection:
1. Add new task
2. Print all tasks
3. Save tasks
4. Load tasks from disk
5. Find high priority tasks
6. Sort by date
7. Delete task

<ENTER> to quit
   
        try:
            menu_choice = int(input("Select a number from the menu: "))
        except:
            print  Goodbye! 
            break

        if menu_choice == 1:

            task = raw_input (">>> Task: ")
            date = raw_input (">>> Date as string YYYYMMDD: ")
            priority = raw_input (">>> Priority: ")
            time = raw_input (">>> Time: ")
            Type = raw_input (">>> Type Of Task: ")
            comment = raw_input (">>> Any Comments? ")
            todo = (task, date, priority, time, Type, comment)

            tasks.add( todo )
            print tasks
        elif menu_choice == 2:
            print divider,  Printing all tasks 
            print tasks
        elif menu_choice == 3:
            print divider,  Saving all tasks 
            tasks.save()
        elif menu_choice == 4:
            print divider,  Loading tasks from disk 
            tasks.load()
        elif menu_choice == 5:
            print divider,  Finding tasks by priority 
            results = tasks.find_by_priority(priority= high )
            for result in results: print result
        elif menu_choice == 6:
            print divider,  Sorting by date 
            tasks.sort_by_date()
            print tasks
        elif menu_choice == 7:

            tasks.delete()

I have deleted parts of my code (hopefully nothing important). Im having trouble getting python to delete my tasks once added. Both methods defined as "def delete" give the error message type error: task/todo object does not support deletion. Does anyone know a way around this?

Answer 1

您不能从列表中删除这样的内容。您的代码有两个问题 :

if you use for to loop through a iterable, you should not change it inside the loop.
to del from list you should use index.

尝试此 :

index = 0
while index < len(self.container):
    delete = raw_input("what number task would you like to delete")
    if delete == "y":
        del self.container[index]
    else:
        index += 1

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