擅长:python、mysql、java
<p>看起来您使用的是Python 3,因此可以使用<a href="http://www.python.org/dev/peps/pep-3102/" rel="nofollow">keyword-only arguments</a>:</p>
<pre><code>>>> def deriv(f, x, *params, h=1.0E-9):
print(f)
print(x)
print(params)
print(h)
>>> deriv(pow, 'x', 10, 20, 30)
<built-in function pow>
x
(10, 20, 30)
1e-09
>>> deriv(pow, 'x', 10, 20, 30, h=.2)
<built-in function pow>
x
(10, 20, 30)
0.2
</code></pre>