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Why do we check up to the square root of a prime number to determine if it is prime?
To test whether a number is prime or not, why do we have to test whether it is divisible only up to the square root of that number?
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Converting int to bytes in Python 3
I was trying to build this bytes object in Python 3:
13 Answers
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Cache Invalidation — Is there a General Solution?
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What you are talking about is lifetime dependency chaining, that one thing is dependent on another which can be modified outside of it's control.
If you have an idempotent function from a, b to c where, if a and b are the same then c is the same ...
Never seen before C++ for loop
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The condition of the for loop is in the middle - between the two semicolons ;.
In C++ it is OK to put almost any expression as a condition: anything that evaluates to zero means false; non-zero means true.
In your case, the condition is u--: when you convert to C#, simply...
How is __eq__ handled in Python and in what order?
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The a == b expression invokes A.__eq__, since it exists. Its code includes self.value == other. Since int's don't know how to compare themselves to B's, Python tries invoking B.__eq__ to see if it knows how to compare itself to an i...
How to mock an import
Module A includes import B at its top. However under test conditions I'd like to mock B in A (mock A.B ) and completely refrain from importing B .
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Why doesn't Dijkstra's algorithm work for negative weight edges?
Can somebody tell me why Dijkstra's algorithm for single source shortest path assumes that the edges must be non-negative.
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How to avoid circular imports in Python? [duplicate]
I know the issue of circular imports in python has come up many times before and I have read these discussions. The comment that is made repeatedly in these discussions is that a circular import is a sign of a bad design and the code should be reorganised to avoid the circular import.
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What does asterisk * mean in Python? [duplicate]
...ng in Python as it does in C? I saw a function like this in the Python Cookbook:
5 Answers
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How can I check if multiplying two numbers in Java will cause an overflow?
I want to handle the special case where multiplying two numbers together causes an overflow. The code looks something like this:
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