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Apache Spark: map vs mapPartitions?
...language engine that will process the map task. (I'm in R, which may have more startup overhead.) If you would be performing multiple operations, then mapPartitions seems to be quite a bit faster -- I'm assuming this is because it reads the RDD only once. Even if the RDD is cached in RAM, that sa...
Inserting code in this LaTeX document with indentation
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Simulating Slow Internet Connection
...tool. It has a setting to simulate modem speed, and for someone who wants more control has a plugin to add latency to each request.
I prefer using a tool like this to putting latency code in my application as it is a much more realistic simulation, as well as not making me design or code the actua...
Comparing two files in linux terminal
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Firing a double click event from a WPF ListView item using MVVM
...part (appearance, animations, etc.) from the logic part (workflow). Furthermore, you are able to unit test the logic part.
I know enough scenarios where you have to write code behind because data binding is not a solution to everything. In your scenario I would handle the DoubleClick event in the c...
Postgres: Distinct but only for one column
I have a table on pgsql with names (having more than 1 mio. rows), but I have also many duplicates. I select 3 fields: id , name , metadata .
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String comparison in Python: is vs. == [duplicate]
...ferred over == None.
I've always liked to use 'is' because
I find it more aesthetically pleasing
and pythonic (which is how I fell into
this trap...), but I wonder if it's
intended to just be reserved for when
you care about finding two objects
with the same id.
Yes, that's exactly...
What does = +_ mean in JavaScript
...st "1" to pure number 1.
var _ = "1";
var r = +_;
r is now 1, not "1".
Moreover, according to the MDN page on Arithmetic Operators:
The unary plus operator precedes its operand and evaluates to its
operand but attempts to converts it into a number, if it isn't
already. [...] It can conve...
List changes unexpectedly after assignment. How do I clone or copy it to prevent this?
...it does not make sense to use it ever. ;) (In his opinion, the next one is more readable).
You can use the built in list() function:
new_list = list(old_list)
You can use generic copy.copy():
import copy
new_list = copy.copy(old_list)
This is a little slower than list() because it has to find o...