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Stack vs heap allocation of structs in Go, and how they relate to garbage collection
...variables live on the stack and allocated memory lives on the heap and and Python-style stack-based-programming where the only thing that lives on the stack are references/pointers to objects on the heap.
...
How to find a Java Memory Leak
... to your application classes. This will give a pretty good hint. Here is a pythons script that can help you compare two jmap histogram dumps. histogramparser.py
Finally tools like JConolse and VisualVm are essential to see the memory growth over time, and see if there is a memory leak. Finally som...
Django REST Framework: adding additional field to ModelSerializer
...to, return the following:
return {
self.field_name: 'Any python object made with data: %s' % data
}
class MyModelSerializer(serializers.ModelSerializer):
my_extra_field = ExtraFieldSerializer(source='*')
class Meta:
model = MyModel
fields = ['id', ...
Deep cloning objects
...you can't know which kind of cloning the underlying object performs. (And XML comments won't make it clear, because you'll get the interface comments rather than the ones on the object's Clone method.)
What I usually do is simply make a Copy method that does exactly what I want.
...
Paging in a Rest Collection
...ng-rest-web-services Another site revolved around Ruby's usage of .json, .xml, .whatever in determining the content type of a request. Some of the examples: * language - putting it in the URL means sending the link to another country would render it in the wrong language. * pagination - Putting i...
Apply multiple functions to multiple groupby columns
...t, it's just a much-more-detailed comment on Ted's answer, plus code/data. Python/pandas is not my first/best, but I found this to read well:
df.groupby('group') \
.apply(lambda x: pd.Series({
'a_sum' : x['a'].sum(),
'a_max' : x['a'].max(),
'b_mean' : x['b'].mea...
How do BitTorrent magnet links work?
...nfo hash is the sha1 hash of the bencoded info block of the torrent.
This python code demonstrates how it can be calculated.
I wrote a (very naive) C# implementation to test this out since I didn't have a bencoder on hand and it matches what is expected from the client.
static string CalculateInf...
How to redirect output to a file and stdout
...
Note that python has a built in option -u that unbuffers output.
– fabian789
Apr 18 '16 at 15:31
1
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What are the advantages of using a schema-free database like MongoDB compared to a relational databa
...document-based data model. The basic unit of storage is analogous to JSON, Python dictionaries, Ruby hashes, etc. This is a rich data structure capable of holding arrays and other documents. This means you can often represent in a single entity a construct that would require several tables to proper...
What does middleware and app.use actually mean in Expressjs?
...note. No other answer mentions this. For a beginner who has worked only on python this is extremely important as these things might have never been encountered.
– Dheeraj M Pai
Dec 29 '19 at 22:12
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