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Convert a Scala list to a tuple?
... solution, the complaints about type-safety mean that you might get a MatchError at runtime. If you want, you can try-catch that error and do something if the List has the wrong length. Another nice feature of this solution is that the output doesn't have to be a tuple, it can be one of your own c...
What is the syntax rule for having trailing commas in tuple definitions?
..., and for Javascript always use jslint or equivalent to catch that sort of error before it gets near a browser.
– Duncan
Nov 3 '11 at 12:15
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Extract subset of key-value pairs from Python dictionary object?
...rations are doing a different thing to the last two, and will result in an error if key doesn't exist in bigdict.
– naught101
Jun 19 at 1:56
1
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Python: finding an element in a list [duplicate]
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But this code gives error when element is not in the list.In current example context if I search for 'three' (i.e: li.index('three')) gives error.
– Kedar.Aitawdekar
May 28 '14 at 7:31
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URL rewriting with PHP
... ...
default:
header('HTTP/1.1 404 Not Found');
Show404Error();
}
This is how big sites and CMS-systems do it, because it allows far more flexibility in parsing URLs, config and database dependent URLs etc. For sporadic usage the hardcoded rewrite rules in .htaccess will do fin...
Useful code which uses reduce()? [closed]
...found for it besides + and * were with and and or, but now we have any and all to replace those cases.
foldl and foldr do come up in Scheme a lot...
Here's some cute usages:
Flatten a list
Goal: turn [[1, 2, 3], [4, 5], [6, 7, 8]] into [1, 2, 3, 4, 5, 6, 7, 8].
reduce(list.__add__, [[1, 2, 3]...
C++ Dynamic Shared Library on Linux
...ed.so", RTLD_NOW);
if (! handler) {
throw std::runtime_error(dlerror());
}
Reset_dlerror();
creator = reinterpret_cast<Base_creator_t>(dlsym(handler, "create"));
Check_dlerror();
}
std::unique_ptr<Base> create() const {
...
How to convert wstring into string?
...is is deprecated (stackoverflow.com/a/42946556/211176). My compiler throws errors when I try to run this code
– adam_0
Feb 14 '18 at 19:53
6
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Which is more preferable to use: lambda functions or nested functions ('def')?
...f p(x): print x
works as expected, while
lambda x: print x
is a SyntaxError.
Of course, there are workarounds - substitute print with sys.stdout.write, or import with __import__. But usually you're better off going with a function in that case.
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Understanding the map function
...your function should look for None and handle them, otherwise you will get errors. In Python 3 map() will stop after finishing with the shortest list. Also, in Python 3, map() returns an iterator, not a list.
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