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Can you use a trailing comma in a JSON object?
...N object or array, it's often easier to leave a trailing comma on the last item in the object or array. For example, code to output from an array of strings might look like (in a C++ like pseudocode):
...
Django Forms: if not valid, show form with error message
... <div id="form_errors">
{% for key, value in form.errors.items %}
<span class="fieldWrapper">
{{ key }}:{{ value }}
</span>
{% endfor %}
</div>
<button type="button" class="close" d...
What is the use of interface constants?
...its.
I wrote a response rebuttal against that hypothesis here: What is the best way to implement constants in Java? explaining the baseless-ness of this hypothesis.
For 10 years that question had stayed open, until it was closed within 2 hours after I posted my reasons dejustifying this hypothesis, ...
What are good uses for Python3's “Function Annotations”
...
This is a way late answer, but AFAICT, the best current use of function annotations is PEP-0484 and MyPy.
Mypy is an optional static type checker for Python. You can add type hints to your Python programs using the upcoming standard for type annotations introduced...
When to use margin vs padding in CSS [closed]
...
The best I've seen explaining this with examples, diagrams, and even a 'try it yourself' view is here.
The diagram below I think gives an instant visual understanding of the difference.
One thing to keep in mind is standard...
How do I configure PyCharm to run py.test tests?
...
I think you need to use the Run/Debug Configuration item on the toolbar. Click it and 'Edit Configurations' (or alternatively use the menu item Run->Edit Configurations). In the 'Defaults' section in the left pane there is a 'py.test' item which I think is what you want.
I...
What is the 'pythonic' equivalent to the 'fold' function from functional programming?
...reduce operations:
Given a list, a reducing function and an accumulator:
items = [1, 2, 3, 4, 5]
f = lambda acc, x: acc * x
accumulator = 1
we can fold items with f in order to obtain the resulting accumulation:
[accumulator := f(accumulator, x) for x in items]
# accumulator = 120
or in a c...
Sorting a Python list by two fields
... Nice. As you noted in comment to the main answer above, this is the best (only?) way to do multiple sorts with different sort orders. Perhaps highlight that. Also, your text does not indicate that you sorted descending on second element.
– PeterVermont
J...
Or versus OrElse
...ative names they must have considered if these were the ones that were the best...
– AakashM
Jul 23 '09 at 10:20
1
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In mongoDb, how do you remove an array element by its index?
...:
Read the document from the database
Update the document and remove the item in the array
Replace the document in the database. To ensure the document has not changed since we read it, we can use the update if current pattern described in the mongo docs
...