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Which is faster : if (bool) or if(int)?
...64 is faster than int? Or CPU deals 32-bit integer with 32-bit instruction sets separately?
– Crend King
Apr 27 '11 at 21:22
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Invalid date format specification in gemspec
...s.
If you really know what you are doing, you can still update rubygems by setting the REALLY_GEM_UPDATE_SYSTEM environment variable, but please remember that this is completely unsupported by Debian.
However I was finally able to update rubygems to 1.8.15 by issuing:
sudo gem install rubygems-up...
Accessing MP3 metadata with Python [closed]
.... You'll have to install using pip or download the tar and execute python setup.py install from the source folder.
Relevant examples from the website are below.
Reading the contents of an mp3 file containing either v1 or v2 tag info:
import eyeD3
tag = eyeD3.Tag()
tag.link("/some/file.mp3")...
How do you allow spaces to be entered using scanf?
Using the following code:
11 Answers
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data.table vs dplyr: can one do something well the other can't or does poorly?
...over these remaining aspects as well:
Grouping operations involving a subset of rows - i.e., DT[x > val, sum(y), by = z] type operations.
Benchmark other operations such as update and joins.
Also benchmark memory footprint for each operation in addition to runtime.
2. Memory usage
Operation...
How to activate an Anaconda environment
...
If this happens you would need to set the PATH for your environment (so that it gets the right Python from the environment and Scripts\ on Windows).
Imagine you have created an environment called py33 by using:
conda create -n py33 python=3.3 anaconda
Her...
Understanding generators in Python
I am reading the Python cookbook at the moment and am currently looking at generators. I'm finding it hard to get my head round.
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data.frame rows to a list
...es of xy.df to be the names of the output list, you can do:
xy.list <- setNames(split(xy.df, seq(nrow(xy.df))), rownames(xy.df))
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Can you list the keyword arguments a function receives?
..., 'kwargs', (42,))
If you want to know if its callable with a particular set of args, you need the args without a default already specified. These can be got by:
def getRequiredArgs(func):
args, varargs, varkw, defaults = inspect.getargspec(func)
if defaults:
args = args[:-len(de...
How do I modify fields inside the new PostgreSQL JSON datatype?
...onb '["a",1]' || jsonb '["b",2]' -- will yield jsonb '["a",1,"b",2]'
So, setting a simple key can be done using:
SELECT jsonb '{"a":1}' || jsonb_build_object('<key>', '<value>')
Where <key> should be string, and <value> can be whatever type to_jsonb() accepts.
For setting ...