[bkz]

Funny how readable Python is:

def condense(s, remove): return "".join([c for c in s if c != remove])

Cheating (2.6+): s.translate(None, remove)

[JoachimSchipper]

You are aware that this is, to a C programmer, horribly inefficient? (Specifically, it violates the "in-place" requirement, but the actual overhead of that is dwarfed by everything else.)

[zepolen]

Either you do it correctly (as in list manipulation, in place) or do it pythonically. That code is somewhere in between.

The pythonic version would be s.replace(c, '')