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What does !! mean in ruby?
...ly not necessary to use though since the only false values to Ruby are nil and false, so it's usually best to let that convention stand.
Think of it as
!(!some_val)
One thing that is it used for legitimately is preventing a huge chunk of data from being returned. For example you probably don't ...
Get statistics for each group (such as count, mean, etc) using pandas GroupBy?
I have a data frame df and I use several columns from it to groupby :
7 Answers
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How to copy a local Git branch to a remote repo
...he source repository (most likely, it would find refs/heads/experimental), and update the same ref (e.g. refs/heads/experimental) in origin repository with it.
If experimental did not exist remotely, it would be created.
This is the same as:
git push origin experimental:refs/heads/experimental
Crea...
Using wget to recursively fetch a directory with arbitrary files in it
...e I store some config files. I'd like to use wget to pull those files down and maintain their current structure. For instance, the remote directory looks like:
...
How to change the font size on a matplotlib plot
...he axes title
plt.rc('axes', labelsize=MEDIUM_SIZE) # fontsize of the x and y labels
plt.rc('xtick', labelsize=SMALL_SIZE) # fontsize of the tick labels
plt.rc('ytick', labelsize=SMALL_SIZE) # fontsize of the tick labels
plt.rc('legend', fontsize=SMALL_SIZE) # legend fontsize
plt.rc('fig...
scopes with lambda and arguments in Rails 4 style?
...Ruby 1.9, the short lambda syntax does not allow a space between the arrow and a parameter (scope :find_lazy, ->(param)). In Ruby 2+, the space is allowed. More info here...
– furman87
Aug 22 '15 at 19:07
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Check if a folder exist in a directory and create them using C#
How can I check if directory C:/ contains a folder named MP_Upload , and if it does not exist, create the folder automatically?
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Check if event exists on element [duplicate]
...s in jQuery? I’m working on a plugin that uses custom namespaced events, and would like to be able to check if the event is binded to an element or not.
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Can I pass an array as arguments to a method with variable arguments in Java?
...rds compatibility.
So you should just be able to prepend extraVar to args and call String.format(format, args).
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What is the best (idiomatic) way to check the type of a Python variable? [duplicate]
...scussion. What are its advantages? Can we see some example code, to understand how it compares? The ABC PEP link is rather heavy with theory and quite a lot to consume when the goal is to simply test if something is a dict or string. Is there additional effort to implement ABCs, and (especially for ...