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Best algorithm for detecting cycles in a directed graph [closed]
...s, I suspect that at some point you are going to sort them into a proposed order of execution.
If that's the case, then a topological sort implementation may in any case detect cycles. UNIX tsort certainly does. I think it is likely that it is therefore more efficient to detect cycles at the same t...
How do I get a Cron like scheduler in Python? [closed]
..." way to do this because some other process would have to launch python in order to run your solution. Every platform will have one or twenty different ways to launch processes and monitor their progress. On unix platforms, cron is the old standard. On Mac OS X there is also launchd, which combin...
Importing from builtin library when module with same name exists
...t relies on python treating paths in one way or looking up modules in that order may break sooner or later.
– Boaz Yaniv
May 17 '11 at 14:38
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Sharing a result queue among several processes
...t-handling, the results in the Manager.Queue also are not guaranteed to be ordered.
The worker processes are not started with .apply_async(), this already happens when you instantiate Pool. What is started
when you call pool.apply_async() is a new "job". Pool's worker-processes run the multiprocess...
How can prepared statements protect from SQL injection attacks?
...nd even alter it, as every SQL injection example shows it (all examples in PHP/Mysql):
$expected_data = 1;
$query = "SELECT * FROM users where id=$expected_data";
will produce a regular query
SELECT * FROM users where id=1
while this code
$spoiled_data = "1; DROP TABLE users;"
$query ...
How do you round a float to two decimal places in jruby
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This doesn't work. In order to get it to work you need to account for any size number. Using the pattern implemented here you can: def float_of_2_decimal(float_n) num = float_n.to_s.split('.') num[1] = num[1][0..1] num...
JavaScript for…in vs for
...u use for in to loop over property names in an object, the results are not ordered. Worse: You might get unexpected results; it includes members inherited from the prototype chain and the name of methods.
Everything but the properties can be filtered out with .hasOwnProperty. This code sample does ...
How do you get the logical xor of two variables in Python?
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Also, there's a difference between a three-way XOR vs. order-of-operations-grouped set of two XORs. So 3-WAY-XOR(A,B,C) is not the same thing as XOR(XOR(A,B),C). And ddaa's example is the former, while yours assumes the latter.
– ely
Oct 23 ...
iOS start Background Thread
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Creating a blocking Queue in .NET?
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Does BlockingCollection preserve ordering like a queue?
– joelc
Jul 18 '16 at 19:33
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