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As commented; you should not mutate, do the following instead

Given that you want 4,3,2, you're looking for:

It looks like the file you are reading does not contain the geospatial point you are trying to find data for. (If this is incorrect please let me know).

You can add a statement to catch if a point is contained in the data:

install your libraries in "C:\Program Files\Python39\python.exe" or any python environment

and try this:

One can say there are two kinds of forms a bound form and an unbound form. What is the difference between these? Well a bound form is passed some data MyForm(request.POST, request.FILES) and an unbound form isn't passed any data MyForm(). By logic an unbound form can never be valid because, well it was never submitted and it is assumed to be created to simply display / render the form.

This logic similarly follows for formsets, and hence as you haven't passed any data to your formset it will never be valid. Another thing to be considered is that you haven't rendered the hidden fields for the formset. A formset makes certain hidden fields so that it can recognize which sub form is for which objects and some other things like deletion, etc. Without these hidden fields also your formset would be invalid.

Hence your view should be like:

The only reason to have a reverse iterator is to go backwards through the sequence. If you were OK with using -- you could just use a regular iterator. Always use ++.

The error message you report is quite clear: adding an attribute to an element after children have been added to it is an error:
https://www.w3.org/TR/1999/REC-xslt-19991116/#creating-attributes

That means that instead of:

When you are calling erase(v), you are invalidating the base iterator that the next reverse_iterator (from ++it) is using. So you need to create a new reverse_iterator from the base iterator that precedes the erased value.

Also, rather than erasing the value that the reverse_iterator is referring to, you should erase the base iterator instead, since you already know which element you want to erase. There is no need to make the map go hunting for the value again.

This works for me:

You can covert the string into an array of string separated by line breaks using .split(/\r\n|\r|\n/) like this: