Python: split float after 3rd decimal place
<p>I have a series of strings, which are two numbers:</p>

<pre><code>1.782-100.799
-18.107-102.016
-17.504104.059
</code></pre>

<p>How do I split my string after the 3rd decimal place of the first number in each string? so it looks as follows:</p>

<pre><code>1.782 -100.799
-18.107 -102.016
-17.504 104.059
</code></pre>
