擅长:python、mysql、java
<p>最好是这样:</p>
<pre><code>from math import cos
def diff(lhs, rhs, delta):
return abs(lhs - rhs) > delta
curr = 2.0
prev = 0.1
while diff(curr, prev, 0.00000001):
curr, prev = cos(curr), curr
</code></pre>
<p>这样,每个循环只计算一次<code>cos()</code>。在</p>