On 6/19/2011 11:13 AM, Chris Angelico wrote:
On Mon, Jun 20, 2011 at 12:32 AM, TheSaint<nob...@nowhere.net.no> wrote:
Hello
Trying to pop some key from a dict while is iterating over it will cause an
exception.
How I can remove items when the search result is true.
Example:
while len(dict):
for key in dict.keys():
if dict[key] is not my_result:
dict.pop(key)
else:
condition_to_break
print('Dictionary is over')
One way is to iterate over an explicitly formed list of the keys.
for key in list(dict.keys()):
That creates an entirely new list with a snapshot copy of the keys. If
you then remove elements from the dictionary, the list will still
iterate correctly.
The other is to make a set of to_be_deleted keys and delete them all
when done.
If you only want to delete one key, break the iteration and then delete.
I'm not sure what you're trying to do, but you may find it easier to
use the 'filter' function (which takes an iterable, so possibly use
dict.iteritems() for that).It'll keep some and not others, and then
you can make use of just the ones you get back.
--
Terry Jan Reedy
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