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Argparse optional positional arguments?
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edited Jan 2 '17 at 8:30
anatoly techtonik
16.3k88 gold badges102102 silver badges124124 bronze badges
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Is the “struct hack” technically undefined behavior?
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52
As the C FAQ says:
It's not clear if it's legal or portable, but it is rather popular.
and...
Calling pylab.savefig without display in ipython
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2 Answers
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How do I get the first element from an IEnumerable in .net?
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247
If you can use LINQ you can use:
var e = enumerable.First();
This will throw an exception t...
How can I compare two lists in python and return matches
...nt one, but by far the most obvious way to do it is:
>>> a = [1, 2, 3, 4, 5]
>>> b = [9, 8, 7, 6, 5]
>>> set(a) & set(b)
{5}
if order is significant you can do it with list comprehensions like this:
>>> [i for i, j in zip(a, b) if i == j]
[5]
(only works...
How do I create a directory from within Emacs?
...ET dir/to/create RET
to create directories dir/parent1/node and dir/parent2/node, type:
M-! mkdir -p dir/parent{1,2}/node RET
It assumes that Emacs's inferior shell is bash/zsh or other compatible shell.
or in a Dired mode
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It doesn't create nonexistent parent directories.
Example:
C-x d ...
Why is Double.MIN_VALUE in not negative
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182
The IEEE 754 format has one bit reserved for the sign and the remaining bits representing the ma...
How to convert ActiveRecord results into an array of hashes
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212
as_json
You should use as_json method which converts ActiveRecord objects to Ruby Hashes desp...
How to make --no-ri --no-rdoc the default for gem install?
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12 Answers
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