How can I add spaces where ever I have capital letters?

[John Schroeder]

I have a string (which I got from the names of my classes) and I would like
to print out my CamelCase classes as titles.

I would like it to do this:

>>> my_class_name = "ModeCommand"
## Do some magic here
>>> my_class_name
'Mode Command'

Anyone know any easy way to do this?  Thanks.
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