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Listing all permutations of a string/integer
A common task in programming interviews (not from my experience of interviews though) is to take a string or an integer and list every possible permutation.
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What does it mean when git says a file “needs update”?
...a file that's dirty (currently modified in your working tree). You need to commit your outstanding changes, or stash them, pull/rebase/merge/whatever you're doing to update, and unstash
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Update just one gem with bundler
... version in Gemfile or possibly Gemfile.lock prior to running these bundle commands
– Harry Wood
Sep 10 '19 at 22:16
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On logout, clear Activity history stack, preventing “back” button from opening logged-in-only Activi
...thod:**/
Intent broadcastIntent = new Intent();
broadcastIntent.setAction("com.package.ACTION_LOGOUT");
sendBroadcast(broadcastIntent);
The receiver (secured Activity):
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
/**snip **/
IntentFilter in...
Why use 'git rm' to remove a file instead of 'rm'?
...h will remove the file from the index (staging it for deletion on the next commit), but keep your copy in the local file system.
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What are some compelling use cases for dependent method types?
..., and apparently this seems to have created some excitement in the Scala community.
4 Answers
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Timeout function if it takes too long to finish [duplicate]
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Nice. Also, it is recommended to decorate the function wrapper with @functools.wraps(func)
– shx2
Oct 31 '13 at 19:58
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Store query result in a variable using in PL/pgSQL
...le. Don't leave out the table name prefix on test_table.name or you'll get complaints about an ambiguous reference.
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Filtering a list based on a list of booleans
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You're looking for itertools.compress:
>>> from itertools import compress
>>> list_a = [1, 2, 4, 6]
>>> fil = [True, False, True, False]
>>> list(compress(list_a, fil))
[1, 4]
Timing comparisons(py3.x):
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What is pseudopolynomial time? How does it differ from polynomial time?
...me, we need to start off by formalizing what "polynomial time" means.
The common intuition for polynomial time is "time O(nk) for some k." For example, selection sort runs in time O(n2), which is polynomial time, while brute-force solving TSP takes time O(n · n!), which isn't polynomial time.
The...