Question

考虑以下扩展list的类并附加orderedtuple s：

from collections import namedtuple

Order = namedtuple('Order', ['id', 'value'])


class Orders(list):
    def __init__(self, *args):
        super(Orders, self).__init__()
        self.extend(args)

    def add(self, id, value):
        self.append(Order(id, value))

...添加一些元素......

order = Orders()

order.add(1, 'alpha')
order.add(2, 'beta')
order.add(3, 'lambda')
order.add(4, 'omega')

......我们离开......

print order
[Order(id=1, value='alpha'), Order(id=2, value='beta'), Order(id=3, value='lambda'), Order(id=4, value='omega')]

说我想删除id的任意元素。例如：

order.remove(id=2) # ideal function call to remove by `id`
print order
[Order(id=1, value='alpha'), Order(id=3, value='lambda'), Order(id=4, value='omega')]

是否有一种相当简单的方法可以实现这一目标？

Answer 1

你可以慢慢地这样做：

def remove(self, id=None, value=None):
    for elem in self:
        if (id is not None and elem.id == id or
                value is not None and elem.value == value):
            super(Orders, self).remove(elem)
            break

您可以向类中添加一个索引，用于跟踪地图ID和/或值到特定索引，但在操作包含的订单列表时，您需要使该索引保持最新。它看起来像这样：

def __init__(self, *args):
    # ...
    self._ids = {}

def append(self, id, value):
    if id in ids:
        raise ValueError('This order already exists!')
    super(Orders, self).append(Order(id, value))
    self._ids[id] = len(self) - 1

并且，如果您还调整了可以更改列表和更改排序等的所有其他方法，您可以通过其ID快速查找订单：

def remove(self, id):
    if id not in self._ids
        raise ValueError('No such order exists!')
    del self[self._ids[id]]

Answer 2

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<form id="myform_1">        
    <select class="form-control" name="tipo">
        <option value="standard">standard</option>
    </select>
    <input type="number" name="giorni" value="90"/>
    <input type="number" name="attesa" value="1"/>  
    <button type="button" onclick="FormManipulator(this)">Crea</button>
</form>

<form id="myform_2">        
    <select class="form-control" name="tipo">
        <option value="standard">standard</option>
    </select>
    <input type="number" name="giorni" value="90"/>
    <input type="number" name="attesa" value="1"/>  
    <button type="button" onclick="FormManipulator(this)">Crea</button>
</form>

根据值从列表中删除namedtuple

3 个答案: