大约有 10,700 项符合查询结果（耗时：0.0248秒） [XML]
Getting the last element of a list
...stpones the inevitable "list index out of range" - and that's what should happen when attempting to get an element from an empty list. For Strings astr[-1:] could be a valid approach since it returns the same type as astr[-1], but I don't think the ':' helps to deal with empty lists (and the questio...
REST API - why use PUT DELETE POST GET?
...l access of data. When you see a request in REST, it should immediately be apparant what is happening with the data.
For example:
GET: /cars/make/chevrolet
is likely going to return a list of chevy cars. A good REST api might even incorporate some output options in the querystring like ?output=j...
Convert PDF to clean SVG? [closed]
...hs, too. I also find that they often lose the font data, but don't seem to approximate a good, installed font. How does PDF display it if SVG can't?
– DanRedux
Apr 23 '12 at 21:30
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Wait for all promises to resolve
... Can you show us your code (maybe ask a new question)? Are there items appended to the chain after Q.all was executed - otherwise it should be trivial?
– Bergi
Feb 13 '14 at 18:46
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Django - what is the difference between render(), render_to_response() and direct_to_template()?
...late[, dictionary][, context_instance][, content_type][, status][, current_app])
render() is a brand spanking new shortcut for render_to_response in 1.3 that will automatically use RequestContext that I will most definitely be using from now on.
2020 EDIT: It should be noted that render_to_resp...
Why is there no xrange function in Python3?
...ments, using timeit instead of trying to do it manually with time.
First, Apple 2.7.2 64-bit:
In [37]: %timeit collections.deque((x for x in xrange(10000000) if x%4 == 0), maxlen=0)
1 loops, best of 3: 1.05 s per loop
Now, python.org 3.3.0 64-bit:
In [83]: %timeit collections.deque((x for x in ...
Fragment transaction animation: slide in and slide out
... works only when using support fragments (android.support.v4.app.Fragment)
– Aviv Ben Shabat
Feb 9 '16 at 7:20
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Practical use of `stackalloc` keyword
... @MaxBarraclough Because you add the GC cost to heap allocations over the application lifetime. Total allocation cost = allocation + deallocation, in this case pointer bump + GC Heap, vs pointer bump + pointer decrement Stack
– Pop Catalin
Dec 18 '18 at 10:04
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Small Haskell program compiled with GHC into huge binary
...braries are copied in verbatim.
Aside: since this is a graphics-intensive app, I'd definitely compile with ghc -O2
There's two things you can do.
Stripping symbols
An easy solution: strip the binary:
$ strip A
$ du -hs A
5.8M A
Strip discards symbols from the object file. They are generall...
What is the difference between Non-Repeatable Read and Phantom Read?
...solation level to be used?
What isolation level you need depends on your application. There is a high cost to a "better" isolation level (such as reduced concurrency).
In your example, you won't have a phantom read, because you select only from a single row (identified by primary key). You can ha...