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Extract substring using regexp in plain bash
I'm trying to extract the time from a string using bash, and I'm having a hard time figuring it out.
4 Answers
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Executing periodic actions in Python [duplicate]
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At the end of foo(), create a Timer which calls foo() itself after 10 seconds.
Because, Timer create a new thread to call foo().
You can do other stuff without being blocked.
import time, threading
def foo():
print(time.ctime())
threading.Timer(...
How can I “pretty print” a Duration in Java?
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Joda Time has a pretty good way to do this using a PeriodFormatterBuilder.
Quick Win: PeriodFormat.getDefault().print(duration.toPeriod());
e.g.
//import org.joda.time.format.PeriodFormatter;
//import org.joda.time.format.Perio...
Sleeping in a batch file
...onds (usually in a test/wait loop, waiting for a process to start). At the time, the best solution I could find uses ping (I kid you not) to achieve the desired effect. I've found a better write-up of it here , which describes a callable "wait.bat", implemented as follows:
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What is the optimal Jewish toenail cutting algorithm?
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Randomly pick two different sequences. Remember which ones you used last time.
EDIT: If this isn't really about toes, but about some random problem where the set can be much larger than 5, the sequence space becomes very large and the chance of repeating the same sequence on the second foot beco...
Is it possible to use argsort in descending order?
... elements:
avgDists.argsort()[::-1][:n]
Both methods are O(n log n) in time complexity, because the argsort call is the dominant term here. But the second approach has a nice advantage: it replaces an O(n) negation of the array with an O(1) slice. If you're working with small arrays inside loo...
Convert String to SecureString
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AppendChar doesn't execute until run time, so those characters can still be read from the IL, correct? Maybe some compile-time obfuscation would help as well... that is, if you're hard-coding passwords.
– samis
Aug 22 '18 a...
Why aren't variable-length arrays part of the C++ standard?
...s to the type system (you need to be able to specify types depending on runtime values - this does not yet exist in current C++, except for new operator type-specifiers, but they are treated specially, so that the runtime-ness doesn't escape the scope of the new operator).
You can use std::vector, ...
How to determine if a point is in a 2D triangle? [closed]
... clockwise), you don't need to calculate all of those determinants all the time. In fact in the best case, 1 determinant is enough to find that the point is not inside the triangle.
– Thash
Sep 9 '16 at 15:28
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Python dictionary: Get list of values for list of keys
... function call (that returns a dict) then this calls the function multiple times, right?
– endolith
Sep 30 '18 at 3:09
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