what does {:02d} mean in Python
<p>it's very hard to find information about <code>{:}</code> online
I saw some code below:</p>

<pre><code>def dateformat(date):
    day, month, year=date.split('/')
    return "{:4d}{:02d}{:02d}".format(int(year),int(month),int(day))
</code></pre>

<p>I kinda of know it is filling leading <code>0</code> in the format, but I don't know what do <code>'02'</code> and <code>'d'</code> in <code>{:02d}</code> do?</p>