On 2/9/15 2:24 PM, Ned Batchelder wrote:
On 2/9/15 2:14 PM, Charles Hixson wrote:
I'm trying to write a correct iteration over a doubly indexed container,
and what I've got so far is: def __next__ (self):
for row in range(self._rows):
for col in range(self._cols):
if self._grid[row][col]:
yield self._grid[row][col]
#end if
#end for col
#end for row
raise StopIteration
What bothers me is that it doesn't look like it would continue to raise
StopIteration if it were called again, which is what
https://docs.python.org/3/library/stdtypes.html#iterator.__next__ says
is correct. How should this be fixed?
You are using yield, which means __next__ is a generator. As such, you
don't have to explicitly raise StopIteration at all. Just remove that
statement, and you should be fine.
Also, look into how you are posting, the code is nearly mangled. :(
Oops, __next__ isn't right here, it should be __iter__:
def __iter__(self):
for row in range(self._rows):
for col in range(self._cols):
if self._grid[row][col]:
yield self._grid[row][col]
--
Ned Batchelder, http://nedbatchelder.com
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