大约有 21,000 项符合查询结果（耗时：0.0452秒） [XML]
What does “coalgebra” mean in the context of programming?
...ing and PLT circles, especially when the discussion is about objects, comonads, lenses, and such. Googling this term gives pages that give mathematical description of these structures which is pretty much incomprehensible to me. Can anyone please explain what coalgebras mean in the context of progra...
Python list sort in descending order
...
cs95
231k6060 gold badges390390 silver badges456456 bronze badges
answered Nov 15 '10 at 10:42
Ignacio Vazquez-AbramsIgna...
What characters are allowed in an email address?
...xtent, RFC 5321: Simple Mail Transfer Protocol.
RFC 822 also covers email addresses, but it deals mostly with its structure:
addr-spec = local-part "@" domain ; global address
local-part = word *("." word) ; uninterpreted
...
Please explain the exec() function and its family
...simple operations, the entire UNIX execution model can be constructed.
To add some more detail to the above:
The use of fork() and exec() exemplifies the spirit of UNIX in that it provides a very simple way to start new processes.
The fork() call makes a near duplicate of the current process, ident...
What is the purpose of the -m switch?
...
The first line of the Rationale section of PEP 338 says:
Python 2.4 adds the command line switch -m to allow modules to be located using the Python module namespace for execution as scripts. The motivating examples were standard library modules such as pdb and profile, and the Python 2.4 impl...
How do I install g++ for Fedora?
...
SchwernSchwern
116k2020 gold badges139139 silver badges275275 bronze badges
...
jQuery: Count number of list elements?
I've got a list that is generated from some server side code, before adding extra stuff to it with jQuery I need to figure out how many items are already in it.
...
How to upgrade rubygems
I need to upgrade gems to 1.8 i tried installing the respective debian packages but it seems its not getting upgraded
8 An...
Why were pandas merges in python faster than data.table merges in R in 2012?
...sely with R's own global string hash table. Some benchmark results are already reported by test.data.table() but that code isn't hooked up yet to replace the levels to levels match.
Are pandas merges faster than data.table for regular integer columns? That should be a way to isolate the algorithm ...
Str_replace for multiple items
... NullUserExceptionNullUserException
75.1k2424 gold badges194194 silver badges225225 bronze badges
...