for elem in iterable:...if should_break(elem):raise SomeExceptionexcept SomeException as e:handle_break_behaviour(e)else:print("Did not break")
try:for elem in iterable:...if should_break(elem):raise SomeExceptionexcept SomeException as e:handle_break_behaviour(e)else:print("Did not break")
def insert_ordered_no_duplicates(duplicate_free_list, item):for i, elem in enumerate(duplicate_free_list):if elem == item:break already_presentif elem > item:break location_foundcase already_present:return duplicate_free_listcase location_found:new_list = duplicate_free_list[:]new_list.insert(i, item)return new_listnew_list = duplicate_free_list[:]new_list.append(item)return new_list
def insert_many_ordered_strictly_no_duplicates(dup_free_list, items):new_list = dup_free_list[:]for item in items:for i, elem in new_list:if elem == item:break already_presentif elem > item:break location_foundcase already_present:break duplicates_attemptedcase location_found:new_list.insert(i, item)else:new_list.append(item)case duplicates_attempted:return dup_free_list[:]return new_list
I note that both of these examples could be handled by having a way to break out of 2 loops at a time._______________________________________________
Rob
On 29/07/2020 12:33, Jonathan Fine wrote:
Thank you all, particularly Guido, for your contributions. Having some examples will help support the exploration of this idea.
Here's a baby example - searching in a nested loop. Suppose we're looking for the word 'apple' in a collection of books. Once we've found it, we stop.
for book in books:
for page in book:
if 'apple' in page:
break
if break:
break
However, suppose we say that we only look at the first 5000 or so words in each book. (We suppose a page is a list of words.)
This leads to the following code.
for book in books:
word_count = 0
for page in book:
word_count += len(page)
if word in page:
break
if word_count >= 5000:
break found
if break found:
break
At this time, I'd like us to focus on examples of existing code, and semantics that might be helpful. I think once we have this, the discussion of syntax will be easier.
By the way, the word_count example is as I typed it, but it has a typo. Did you spot it when you read it? (I only noticed it when re-reading my message.)
Finally, thank you for your contributions. More examples please.
--Jonathan
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