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Code: Alles auswählen

def gen(start=None):
    if start is None:
        raise StopIteration('No start no trip!')
    for trip in ['Paris', 'London', 'Bruessel', 'Heimertingen'][start:]:
        yield trip

Code: Alles auswählen

def gen(start=None):
    if start is not None:
        # loop

Code: Alles auswählen

>>> def gen(start=None):
...     if start is None:
...         return
...     for trip in ['Paris', 'London', 'Bruessel', 'Heimertingen'][start:]:
...         yield trip
...         
... 
>>> x = gen()
>>> x.next()
Traceback (most recent call last):
  File "<input>", line 1, in <module>
StopIteration
>>> def gen2():
...     if 2 < 5:
...         return 38
...     else:
...         yield 42
SyntaxError: 'return' with argument inside generator (<input>, line 6)