擅长:python、mysql、java
<p>虽然我可能误解了这个问题,你可以用这样的话</p>
<pre class="lang-python prettyprint-override"><code>>>> def is_neg(l):
... # ascertain the sign of the values
... l = map(lambda value: value < 0, l)
... # ascertain that all values are negative
... return all(l)
>>>
>>> l = [-1, -2, -3]
>>> print(is_neg(l))
True
>>> l = [-1, 2, -3]
>>> print(is_neg(l))
False
</code></pre>