大约有 40,000 项符合查询结果（耗时：0.0494秒） [XML]
mysqli or PDO - what are the pros and cons? [closed]
...nted aspect, the prepared statements, the fact that it becomes a standard, etc. But I know that most of the time, convincing somebody works better with a killer feature. So there it is:
A really nice thing with PDO is you can fetch the data, injecting it automatically in an object. If you don't wan...
Loop through an array of strings in Bash?
... glob it'll be expanded, if it contains a tab it'll be changed to a space, etc.
– Charles Duffy
Jul 9 '16 at 15:02
...
Python: Tuples/dictionaries as keys, select, sort
... 'blue'])
for k in blue_fruit:
print k[0], data[k] # prints 'banana 24', etc
Sorting works because tuples have natural ordering if their components have natural ordering.
With keys as rather full-fledged objects, you just filter by k.color == 'blue'.
You can't really use dicts as keys, but yo...
Passing a std::array of unknown size to a function
... let you use any container (array,list, vector,even old school C pointers, etc) with no downside. Thanks for the hint.
– Mark Lakata
Jun 29 '15 at 18:04
add a comment
...
Conditional compilation and framework targets
...e combined with Jeremy's to keep it at one place rather than Debug|Release etc.
For me, combining both variations works best i.e. including conditions in code using #if NETXX and also building for different framework versions in one go.
I have these in my .csproj file:
<PropertyGroup>
...
How do I check if a list is empty?
...already an array, or wraps your input into an array if it's a list, tuple, etc., and optionally converts it to your chosen dtype. So it's very quick whenever it can be, and it ensures that you just get to assume the input is a NumPy array. We usually even just use the same name, as the conversion ...
Queue.Queue vs. collections.deque
...ation.
In fact the heavy usage of an extra mutex and extra method ._get() etc. method calls in Queue.py is due to backwards compatibility constraints, past over-design and lack of care for providing an efficient solution for this important speed bottleneck issue in inter-thread communication. A lis...
What is the pythonic way to avoid default parameters that are empty lists?
... I like it especially because it's a neat little one-liner without colons, etc. involved and it nearly reads like a normal English sentence. :)
In your case you could write
def myFunc(working_list=None):
working_list = [] if working_list is None else working_list
working_list.append("a")
...
App Inventor 2 中的响应式设计 · App Inventor 2 中文网
...nes with a different screen size. Making apps that have this property is called responsive design.
A common approach to responsive design is to build apps that include multiple layouts and multiple images to accommodate different screen sizes and resolutions. This gives good results, but it makes...
Installing Python 3 on RHEL
...-c 'wget -qO- http://people.redhat.com/bkabrda/scl_python33.repo >> /etc/yum.repos.d/scl.repo'
sudo yum install python33
scl enable python27
(This last command will have to be run each time you want to use python27 rather than the system default.)
...