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Iterate through every file in one directory
...on all files in subdirs:
Dir.glob("**/*.txt") do |my_text_file| # note one extra "*"
puts "working on: #{my_text_file}..."
end
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Why is Node.js single threaded? [closed]
...he single threaded, async nature does make things complicated. But do you honestly think it's more complicated than threading? One race condition can ruin your entire month! Or empty out your thread pool due to some setting somewhere and watch your response time slow to a crawl! Not to mention deadl...
Difference between Fact table and Dimension table?
... set of tables and consolidate data (possibly from different systems) into one database structure that can be queried in a very efficient way.
On its simplest form, it contains a fact table (Example: StoreSales) and a one or more dimension tables. Each Dimension entry has 0,1 or more fact tables as...
Should import statements always be at the top of a module?
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One use case is avoiding circular imports (not usually sensible, but sometimes it is suitable). Sometimes class A in module m1 calls a method on class B in module m2 which constructs another instance of class A. If the method...
How can I select multiple columns from a subquery (in SQL Server) that should have one record (selec
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Thank you, outer apply is better than join, because one can reference other parameters as well, which is needed for more complex functions calls etc.
– Andreas Reiff
Jan 25 '18 at 10:22
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How to decide when to use Node.js?
...ould create immense load on the server, because each active client eats up one server process. This situation amounts to a tarpit attack. When you use something like Node.js, the server has no need of maintaining separate threads for each open connection.
This means you can create a browser-based...
What is a plain English explanation of “Big O” notation?
...integers. But a comparison of two algorithms to do arithmetic operations (one multiplication, one addition) will tell you something meaningful;
representation: Big-O (in its simplest form) reduces the comparison between algorithms to a single variable. That variable is chosen based on observations...
Pandas DataFrame Groupby two columns and get counts
...ndas as pd
df = pd.DataFrame([['A','C','A','B','C','A','B','B','A','A'], ['ONE','TWO','ONE','ONE','ONE','TWO','ONE','TWO','ONE','THREE']]).T
df.columns = [['Alphabet','Words']]
print(df) #printing dataframe.
This is our printed data:
For making a group of dataframe in pandas and counter,
You...
Extract file basename without path and extension in bash [duplicate]
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The basename command has two different invocations; in one, you specify just the path, in which case it gives you the last component, while in the other you also give a suffix that it will remove. So, you can simplify your example code by using the second invocation of basename. ...
How are 3D games so efficient? [closed]
...render, and
They take special advantage of your hardware.
For instance, one easy optimization you can make involves not actually trying to draw things that can't be seen. Consider a complex scene like a cityscape from Grand Theft Auto IV. The renderer isn't actually rendering all of the buildings...