Fehlerbehandlung


   import operator

   def harmonic(*arg):

     return len(arg)/reduce(operator.add,
     map(lambda x:1.0/x, arg))


   >>> harmonic(1,5,0,3)

   
   Traceback (most recent call last):

    File "<stdin>", line 1, in ?

    File "<stdin>", line 2, in harmonic

    File "<stdin>", line 2, in <lambda>

   ZeroDivisionError: float division

Abfangen von Exceptions


   >>> try: harmonic(1,5,0,3)

   ... except ZeroDivisionError, message:
     print "Division durch Null:", message

   ...

   Division durch Null: float division

Aufräumarbeiten


   f=open("/tmp/daten.txt")

   try: do_something_with_file(f)

   finally: f.close()