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How to start a background process in Python?
I'm trying to port a shell script to the much more readable python version. The original shell script starts several processes (utilities, monitors, etc.) in the background with "&". How can I achieve the same effect in python? I'd like these processes not to die when the python scripts complete. I ...
How to count the number of set bits in a 32-bit integer?
...ith a few clever optimizations. Continuing on with the same pattern for 2 more steps can widen to 2x 16-bit then 1x 32-bit counts. But there is a more efficient way on machines with fast hardware multiply:
Once we have few enough "elements", a multiply with a magic constant can sum all the element...
Inverse dictionary lookup in Python
...t forget that the value may be found on any number of keys, including 0 or more than 1.
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Simplest way to read json from a URL in java
...n, and I have to concatenate the lines instead of the characters, which is more expensive. That wouldn't keep the code as short as it is now. Furthermore, in JSON notation there is no concept of "lines", so why should I read them as such?
– Roland Illig
Dec 1 '...
Why is iostream::eof inside a loop condition (i.e. `while (!stream.eof())`) considered wrong?
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What are metaclasses in Python?
... define the type of a class, not just a factory for it, so you can do much more with them. You can, for instance, define normal methods on the metaclass. These metaclass-methods are like classmethods in that they can be called on the class without an instance, but they are also not like classmethods...
How to parse freeform street/postal address out of text, and into components
...or an address verification company. I'm posting the answer here to make it more accessible to programmers who are searching around with the same question. The company I was at processed billions of addresses, and we learned a lot in the process.
First, we need to understand a few things about addres...
Static linking vs dynamic linking
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Dynamic linking can reduce total resource consumption (if more than one process shares the same library (including the version in "the same", of course)). I believe this is the argument that drives it its presence in most environments. Here "resources" includes disk space, RAM, and ...
Remap values in pandas column with a dict
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It looks like this doesn't work anymore at all, which isn't surprising given the answer was from 4 years ago. This question needs a new answer given how general the operation is...
– PrestonH
Nov 21 '17 at 17:01
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What is HEAD in Git?
...he commit from which the working tree's current state was initialized. In more practical terms, it can be thought of as a symbolic reference to the checked-out commit.
– Ben Collins
Dec 9 '13 at 7:25
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