擅长:python、mysql、java
<p>对于dictionary,它意味着从dictionary中获取元素</p>
<pre class="lang-py prettyprint-override"><code>dictionary = {
'item_1': '...',
'item_2': '1',
'item_3': 2,
}
dictionary['item_1'] # you can get item_1 from dictionary like this
# or this
item_name = 'item_1'
dictionary[item_name]
</code></pre>
<p>对于列表,可以使用索引获取其中的项存储</p>
<pre class="lang-py prettyprint-override"><code> obj = object()
li = [1, '2', obj, ]
# slicing operation in list
li[0] # get the 1st item.
li[-1] # get the last item.
li[1:3] # get item from index 1 to 3 not include index 1.
li[:] # get all item. it can use to copy the list.
</code></pre>