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MongoDB数据导出导入工具：mongoexport,mongoimport - 大数据 & AI - 清泛...
...ssage
-v [ --verbose ] be more verbose (include multiple times for more
verbosity e.g. -vvvvv)
--version print the program's version and exit
-h [ --host ] arg mongo host to connect to ( <set name>/s1,s2 for sets)
--port arg ...
What's the common practice for enums in Python? [duplicate]
What's the common practice for enums in Python? I.e. how are they replicated in Python?
4 Answers
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Which method performs better: .Any() vs .Count() > 0?
...e GetEnumerator()/MoveNext()/Dispose() sequence required by Any() to check for a non-empty IEnumerable<T> sequence.
For just IEnumerable<T>, then Any() will generally be quicker, as it only has to look at one iteration. However, note that the LINQ-to-Objects implementation of Count() do...
Can't pickle when using multiprocessing Pool.map()
... to be pickled, registering it with the copy_reg standard library method.
For example, Steven Bethard's contribution to this thread (towards the end of the thread) shows one perfectly workable approach to allow method pickling/unpickling via copy_reg.
...
Using OR in SQLAlchemy
...you have a long list of things to OR, you can do filter(or_(User.name == v for v in ('Alice', 'Bob', 'Carl')))
– robru
Aug 26 '15 at 20:21
69
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How do exceptions work (behind the scenes) in c++
...the standard library, based on these tables (_ZTI11MyException is typeinfo for MyException).
OK, that was not actually a surprise for me, I already knew how this compiler did it. Continuing with the assembly output:
.text
.align 2
.p2align 4,,15
.globl _Z20my_throwing_functionb
.ty...
Or versus OrElse
...
I never actually knew this was available. Thanks for new information. Good to know, even though I can't really see any situation in which I would want to use "|". I think it would require the second condition to cause side-effects to make any sense, and that in itself makes...
How do i find out what all symbols are exported from a shared object?
...These are all different things, and your question conflates them all :-(
For an AIX shared object, use dump -Tv /path/to/foo.o.
For an ELF shared library, use readelf -Ws /path/to/libfoo.so, or (if you have GNU nm) nm -D /path/to/libfoo.so.
For a non-ELF UNIX shared library, please state which UNI...
How to save all the variables in the current python session?
...one option is to use the 'pickle' module. However, I don't want to do this for 2 reasons:
7 Answers
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How to divide flask app into multiple py files?
...ules, see the Flask docs.
However,
Flask uses a concept of blueprints for making application components and supporting common patterns within an application or across applications.
You can create a sub-component of your app as a Blueprint in a separate file:
simple_page = Blueprint('simple_p...