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What is /dev/null 2>&1?
...v/null has the same net effect. I usually just use > for that reason.)
2>&1 redirects standard error (2) to standard output (1), which then discards it as well since standard output has already been redirected.
sh...
App Inventor 2 中文网 · 项目指南
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How to avoid overflow in expr. A * B - C * D
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120
This seems too trivial I guess.
But A*B is the one that could overflow.
You could do the follo...
Can I get JSON to load into an OrderedDict?
...ecoder(object_pairs_hook=collections.OrderedDict).decode('{"foo":1, "bar": 2}')
OrderedDict([('foo', 1), ('bar', 2)])
>>>
You can pass this parameter to json.loads (if you don't need a Decoder instance for other purposes) like so:
>>> import json
>>> from collections i...
How to update Python?
I have version 2.7 installed from early 2012. I can't find any consensus on whether I should completely uninstall and wipe this version before putting on the latest version.
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~x + ~y == ~(x + y) is always false?
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237
Assume for the sake of contradiction that there exists some x and some y (mod 2n) such that
~...
Combining two lists and removing duplicates, without removing duplicates in original list
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172
You need to append to the first list those elements of the second list that aren't in the first ...
Difference between break and continue statement
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21 Answers
21
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Cartesian product of multiple arrays in JavaScript
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2020 Update: 1-line (!) answer with vanilla JS
Original 2017 Answer: 2-line answer with vanilla JS:
(see updates below)
All of the answers here are overly complicated, most of them take 20 lines of code or even more.
This exa...