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Time complexity of Sieve of Eratosthenes algorithm
...-bound is n(1/2 + 1/3 + 1/5 + 1/7 + …), that is sum of reciprocals of primes up to n, which is O(n log log n). (See here or here.)
The "find the next prime number" bit is only O(n) overall, amortized — you will move ahead to find the next number only n times in total, not per step. So this whol...
Creating functions in a loop
...urn i
Default values (the right-hand i in i=i is a default value for argument name i, which is the left-hand i in i=i) are looked up at def time, not at call time, so essentially they're a way to specifically looking for early binding.
If you're worried about f getting an extra argument (and thus...
How to move columns in a MySQL table?
Currently I am having the following MySQL table: Employees (empID, empName, department);
4 Answers
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Task not serializable: java.io.NotSerializableException when calling function outside closure only o
...terface, so this is not what's causing your task to fail. Now this doesn't mean that you can serialise an RDD with Spark and avoid NotSerializableException
Spark is a distributed computing engine and its main abstraction is a resilient distributed dataset (RDD), which can be viewed as a distributed...
Reading a binary file with python
... find particularly difficult reading binary file with Python. Can you give me a hand?
I need to read this file, which in Fortran 90 is easily read by
...
Are email addresses case sensitive?
... part of e-mail is case sensitive, however I've tried to send e-mail to name@example.com , Name@example.com and NAME@example.com - it has arrived in each case.
...
Difference between shadowing and overriding in C#?
What's difference between shadowing and overriding a method in C#?
6 Answers
6
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Django: Why do some model fields clash with each other?
... User. Django automatically creates a reverse relation from User back to GameClaim, which is usually gameclaim_set. However, because you have two FKs, you would have two gameclaim_set attributes, which is obviously impossible. So you need to tell Django what name to use for the reverse relation.
Us...
Should __init__() call the parent class's __init__()?
...o optional whether to use the super identifier, or whether to explicitly name the super class:
object.__init__(self)
In case of object, calling the super method is not strictly necessary, since the super method is empty. Same for __del__.
On the other hand, for __new__, you should indeed call th...
Possible to make labels appear when hovering over a point in matplotlib?
... make scatter plots. Each point on the scatter plot is associated with a named object. I would like to be able to see the name of an object when I hover my cursor over the point on the scatter plot associated with that object. In particular, it would be nice to be able to quickly see the names of th...