大约有 40,000 项符合查询结果（耗时：0.0555秒） [XML]
Delete files older than 10 days using shell script in Unix [duplicate]
... these! Once, using a command very much like this in a cron job, I accidentally deleted every file on my production mail server older than 10 days, which I can tell you was no fun to recover from.
– DSimon
May 28 '14 at 20:00
...
Vim: apply settings on files in directory
How do I specify Vim settings for all files under the current directory?
11 Answers
11...
Plotting a list of (x, y) coordinates in python matplotlib
...on as actual x-y coordinates. Currently, it is making two plots, where the index of the list gives the x-coordinate, and the first plot's y values are the a s in the pairs and the second plot's y values are the b s in the pairs.
...
How to do a less than or equal to filter in Django queryset?
I am attempting to filter users by a custom field in each users profile called profile. This field is called level and is an integer between 0-3.
...
What is better, adjacency lists or adjacency matrices for graph problems in C++?
...y exists you can check for the existence of an edge in constant time using indexes. However, neighbour lookup takes O(n) since you need to check all possible neighbours.
The obvious space drawback is that for sparse graphs a lot of padding is added. See the memory discussion above for more informati...
How to run Django's test database only in memory?
... can't use sqlite, because I'm using features specific to mysql (full-text indexes). For ubuntu users, you'll have to edit your apparmor config to allow mysqld access to /dev/shm/mysql
– Ivan Virabyan
May 4 '11 at 9:47
...
How to read keyboard-input?
... mixing different Pythons here (Python 2.x vs. Python 3.x)...
This is basically correct:
nb = input('Choose a number: ')
The problem is that it is only supported in Python 3. As @sharpner answered, for older versions of Python (2.x), you have to use the function raw_input:
nb = raw_input('Choose...
Why are preprocessor macros evil and what are the alternatives?
I have always asked this but I have never received a really good answer; I think that almost any programmer before even writing the first "Hello World" had encountered a phrase like "macro should never be used", "macro are evil" and so on, my question is: why? With the new C++11 is there a real alte...
Finding quaternion representing the rotation from one vector to another
...
Be aware that this does not handle the case of parallel vectors (both in the same direction or pointing in opposite directions). crossproduct will not be valid in these cases, so you first need to check dot(v1, v2) > 0.999999 and dot(v1, v2) < -0.999999, respectively, ...
Django, creating a custom 500/404 error page
... for some reason request.user appears fine in the 404 template, but not at all in the 500 template (and they are almost identical) -- posted question on this here: stackoverflow.com/questions/26043211/…
– Gravity Grave
Sep 25 '14 at 16:13
...