title: How to fill  specific positional arguments with partial in python?
body: <p>Basically, what I'd like to do is:</p>
  
  <pre><code>&gt;&gt;&gt; from functools import partial
  &gt;&gt;&gt; partial(str.startswith, prefix='a')('a')
  Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
  TypeError: startswith() takes no keyword arguments
  </code></pre>
  
  <p>But more generally the question is, <strong>how to fill specific positional arguments with <code>partial</code></strong>.</p>
  
  <p>P.S. I do realize that I can use a <code>lambda</code> instead.</p>