Modern Python Standard Library Cookbook

How to do it...

Keys ordering is a very convenient feature and in some cases, it's actually necessary, so the Python standard library comes to help and provides the collections.OrderedDict container.

In the case of collections.OrderedDict, the keys are always in the order they were inserted in:

>>> attrs = OrderedDict([('id', 'header'), ('style', 'background-color:red')])
>>> '<span {}>'.format(' '.join('%s="%s"' % a for a in attrs.items()))
'<span id="header" style="background-color:red">'