I was going over some pages from WikiVS, that I quote from:

because lambdas in Python are restricted to expressions and cannot
  contain statements

I would like to know what would be a good example (or more) where this restriction would be, preferably compared to the Ruby language. 
Thank you for your answers, comments and feedback!
Instead of f=lambda s:pass you can do f=lambda s:None.
Restrictons of Python compared to Ruby: lambda's