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What does a double * (splat) operator do
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Ruby 2.0 introduced keyword arguments, and ** acts like *, but for keyword arguments. It returns a Hash with key / value pairs.
For this code:
def foo(a, *b, **c)
[a, b, c]
end
Here's a demo:
> foo 10
=> [10, [], {...
Iterate through pairs of items in a Python list [duplicate]
Is it possible to iterate a list in the following way in Python (treat this code as pseudocode)?
5 Answers
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How to Select Every Row Where Column Value is NOT Distinct
...s] WHERE [EmailAddress] IN
(SELECT [EmailAddress] FROM [Customers] GROUP BY [EmailAddress] HAVING COUNT(*) > 1)
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How to output a comma delimited list in jinja python template?
If I have a list of users say ["Sam", "Bob", "Joe"] , I want to do something where I can output in my jinja template file:
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Getting the name of a variable as a string
...g the python-varname package, you can easily retrieve the name of the variables
https://github.com/pwwang/python-varname
In your case, you can do:
from varname import Wrapper
foo = Wrapper(dict())
# foo.name == 'foo'
# foo.value == {}
foo.value['bar'] = 2
For list comprehension part, you can do:
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Simple and fast method to compare images for similarity
...ty. I.e. I want to get a high value if they contain exactly the same thing but may have some slightly different background and may be moved / resized by a few pixel.
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How do I iterate through each element in an n-dimensional matrix in MATLAB?
I have a problem. I need to iterate through every element in an n-dimensional matrix in MATLAB. The problem is, I don't know how to do this for an arbitrary number of dimensions. I know I can say
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Display name of the current file in vim?
...ill do same as <C-G>. :f! will give a untruncated version, if applicable.
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How to make a great R reproducible example
When discussing performance with colleagues, teaching, sending a bug report or searching for guidance on mailing lists and here on Stack Overflow, a reproducible example is often asked and always helpful.
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How to Display Selected Item in Bootstrap Button Dropdown Title
I am using the bootstrap Dropdown component in my application like this:
14 Answers
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