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As you know, a caught exception can be re-raised with a simple `raise` statement. Plain and simple. However, one cannot re-raise an error with this new `"from" expression` clause.
For example:
 def getch(prompt=''):
 '''Get and return a character (similar to `input()`).'''
 print(prompt, end='')
 try:
 return windows_module.getch()
 except NameError:
 try:
 fallback_module.getch()
 except Exception:
 raise from None
Output:
 File "getch.py", line 11
 raise from None
 ^
 SyntaxError: invalid syntax
A quick look at the documentation about [raise](http://docs.python.org/dev/reference/simple_stmts.html#the-raise-statement) confirms that this is the intended behavior. In my opinion, one should be able to still re-raise from an expression.