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<pre><code>Input:
orders = [[('Fries', 9)], [('Burger', 6), ('Milkshake', 2), ('Cola', 2)], [('Cola', 2), ('Nuggets', 3), ('Onion Rings', 5)], [('Fries', 9)], [('Big Burger', 7), ('Nuggets', 3)]]
Expected Output:
orders = [['Fries'], ['Burger', 'Milkshare', 'Cola'], ['Cola', 'Nuggets', 'Onion Rings'], ['Fries'], ['Big Burger', 'Nuggets']]
</code></pre>
<p>我的尝试:</p>
<pre><code> for i, order in enumerate(orders):
for j,item in enumerate(order):
orders[i][j] = item[0]
</code></pre>
<p>工作正常。但是有没有更直观/更简单/更快/更酷的方法</p>