大约有 18,000 项符合查询结果（耗时：0.0252秒） [XML]
How do I append one string to another in Python?
...s to extend the string in place.
The end result is that the operation is amortized O(n).
e.g.
s = ""
for i in range(n):
s+=str(i)
used to be O(n^2), but now it is O(n).
From the source (bytesobject.c):
void
PyBytes_Conm>cat m>AndDel(register PyObject **pv, register PyObject *w)
{
PyBytes_C...
Cost of len() function
...
It's O(1) (constant time, not depending of actual length of the element - very fast) on every type you've mentioned, plus set and others such as array.array.
share
...
Rolling median algorithm in C
I am currently working on an algorithm to implement a rolling median filter (analogous to a rolling mean filter) in C. From my search of the literature, there appear to be two reasonably efficient ways to do it. The first is to sort the initial window of values, then perform a binary search to inser...
How to find where a method is defined at runtime?
We recently had a problem where, after a series of commits had occurred, a backend process failed to run. Now, we were good little boys and girls and ran rake test after every check-in but, due to some oddities in Rails' library loading, it only occurred when we ran it directly from Mongrel in pro...
Adding a Method to an Existing Object Instance
I've read that it is possible to add a method to an existing object (i.e., not in the class definition) in Python.
16 Answ...
How to declare constant map
I am trying to declare to constant in Go, but it is throwing an error. Could anyone please help me with the syntax of declaring a constant in Go?
...
Initializing IEnumerable In C#
...
Ok, adding to the answers stated you might be also looking for
IEnumerable<string> m_oEnum = Enumerable.Empty<string>();
or
IEnumerable<string> m_oEnum = new string[]{};
...
How to tag an older commit in Git?
...et a tag at the beginning of our repository.
Our production code is the same as the beginning repository, but we've made commits since then.
A tag at the beginning would allow us to "roll back" production to a known, stable state.
...
How do I format a date in Jinja2?
Using Jinja2, how do I format a date field? I know in Python I can simply do this:
9 Answers
...
Scala: What is a TypeTag and how do I use it?
All I know about TypeTags is that they somehow replaced Manifests. Information on the Internet is scarce and doesn't provide me with a good sense of the subject.
...