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What is C# analog of C++ std::pair?
...s belonging to the generic class cannot be inferred in an object creation expression (constructor call), the authors of BCL made a non-generic helper class called Tuple. Therefore you can say Tuple.Create("Hello", 4) which is a bit easier than new Tuple<string, int>("Hello", 4). (By the way, ....
How can I autoformat/indent C code in vim?
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Try the following keystrokes:
gg=G
Explanation: gg goes to the top of the file, = is a command to fix the indentation and G tells it to perform the operation to the end of the file.
sha...
Linux equivalent of the Mac OS X “open” command [closed]
I've found the "open" command in Mac OS X very handy in the command line. From "man open":
7 Answers
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What is the meaning of prepended double colon “::”?
...swers. It makes sure to use identifier from global namespace. Look at the example again
– hungryWolf
Apr 30 '18 at 19:50
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LINQ Select Distinct with Anonymous Types
So I have a collection of objects. The exact type isn't important. From it I want to extract all the unique pairs of a pair of particular properties, thusly:
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Environment variable substitution in sed
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Your two examples look identical, which makes problems hard to diagnose. Potential problems:
You may need double quotes, as in sed 's/xxx/'"$PWD"'/'
$PWD may contain a slash, in which case you need to find a character not contained ...
How to filter Pandas dataframe using 'in' and 'not in' like in SQL
...g.isin(somewhere)
Or for "NOT IN": ~something.isin(somewhere)
As a worked example:
import pandas as pd
>>> df
country
0 US
1 UK
2 Germany
3 China
>>> countries_to_keep
['UK', 'China']
>>> df.country.isin(countries_to_keep)
0 False
1 True
2 ...
How to extract the n-th elements from a list of tuples?
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n = 1 # N. . .
[x[n] for x in elements]
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Convert light frequency to RGB?
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Here's a detailed explanation of the entire conversion process: http://www.fourmilab.ch/documents/specrend/. Source code included!
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How to remove leading and trailing zeros in a string? Python
...12-n\n"," 12091231000-n00000","alphanum0000", "00alphanum"]
pred = lambda x: x in {"0", "\n", " "}
list("".join(mit.strip(i, pred)) for i in iterables)
# ['231512-n', '12091231000-n', 'alphanum', 'alphanum']
Details
Notice, here we strip both leading and trailing "0"s among other elements that...