You should rethrow exception as custom runtime exception, not generic one, for instance SomethingBadRuntimeException. Also, you can try exception tunneling. And I’m assured that forcing client to deal with exceptions by making them checked is a bad practice. It just pollutes your code or forces to wrap exceptions with runtime ones or force to process … Read more
As you note, you can store the items to delete somewhere and defer the deletion of them until later. The problem then becomes when to purge them and how to make sure that the purge method eventually gets called. The answer to this is a context manager which is also a subclass of dict. class … Read more
The type &(&str, &str) comes from what iter() on a Vec returns: fn iter(&self) -> Iter<T> where Iter<T> implements Iterator<Item=&T>: impl<‘a, T> Iterator for Iter<‘a, T> { type Item = &’a T … } In other words, iter() on a vector returns an iterator yielding references into the vector. cloned() solves the problem because it … Read more
A generator will solve your problem nicely. def imerge(a, b): for i, j in itertools.izip(a,b): yield i yield j
Not directly splitting strings as such, but the re module has re.finditer() (and corresponding finditer() method on any compiled regular expression). @Zero asked for an example: >>> import re >>> s = “The quick brown\nfox” >>> for m in re.finditer(‘\S+’, s): … print(m.span(), m.group(0)) … (0, 3) The (4, 9) quick (13, 18) brown (19, … Read more
The design of the standard library’s shiny new string class was already done when Stroustrup introduced the standard committee to the STL. The committee liked the STL and started incorporating it into the standard, thereby adapting much of what they had already agreed on (and probably also delaying the standard for another year or two). … Read more
No, there is no trait that provides iter(). However, IntoIterator is implemented on references to some containers. For example, Vec<T>, &Vec<T> and &mut Vec<T> are three separate types that implement IntoIterator, and you’ll notice that they all map to different iterators. In fact, Vec::iter() and Vec::iter_mut() are just convenience methods equivalent to &Vec::into_iter() and &mut … Read more
These are built-in functions of python, they are used for working with iterables. Basically iter() calls the __iter__() method on the iris_loader which returns an iterator. next() then calls the __next__() method on that iterator to get the first iteration. Running next() again will get the second item of the iterator, etc. This logic often … Read more
You are looking for each_cons: (1..6).each_cons(2) { |a, b| p a: a, b: b } # {:a=>1, :b=>2} # {:a=>2, :b=>3} # {:a=>3, :b=>4} # {:a=>4, :b=>5} # {:a=>5, :b=>6}