Substitute multiple whitespace with single whitespace in Python

I have this
string:

mystring = 'Here is some
            text I wrote
            '

How can I
substituate the double, triple (...) whitespaces to just one whitespace so that I
get:

mystring = 'Here is some text
            I wrote'

class="post-text" itemprop="text">

class="normal">Answer

A simple
possibility (if you'd rather avoid REs)
is

'
            '.join(mystring.split())

The
split and join perform the task you're explicitly asking about -- plus, they also do the
extra one that you don't talk about but is seen in your example, removing trailing
spaces;-).