大约有 40,000 项符合查询结果（耗时：0.0536秒） [XML]
What is the formal difference in Scala between braces and parentheses, and when should they be used?
...ut this, but I gave up in the end, as the rules are somewhat diffuse. Basically, you’ll have to get the hang of it.
Perhaps it is best to concentrate on where curly braces and parenthesis can be used interchangeably: when passing parameters to method calls. You may replace parenthesis with curly b...
Why aren't python nested functions called closures?
...s in Python, and they match the definition of a closure. So why are they called nested functions instead of closures ?
...
Does Python support short-circuiting?
...circuiting "executed" not printed
1
>>> 1 and fun(1) # fun(1) called and "executed" printed
executed
1
>>> 0 and fun(1) # due to short-circuiting "executed" not printed
0
Note: The following values are considered by the interpreter to mean false:
False None ...
jsonify a SQLAlchemy result set in Flask [duplicate]
...
It seems that you actually haven't executed your query. Try following:
return jsonify(json_list = qryresult.all())
[Edit]: Problem with jsonify is, that usually the objects cannot be jsonified automatically. Even Python's datetime fails ;)
Wha...
How many files can I put in a directory?
... subdirectories. Also maximum filesize grew to 16 TB. Furthermore, the overall size of the filesystem may be up to 1 EB = 1,048,576 TB.
– devsnd
Jun 25 '12 at 23:13
7
...
Foreign key constraints: When to use ON UPDATE and ON DELETE
...tent database, and that's one of the good reasons to use a database. Especially if you have several applications requesting it (or just one application but with a direct mode and a batch mode using different sources).
With MySQL you do not have advanced constraints like you would have in postgreSQL...
Why does using an Underscore character in a LIKE filter give me all the results?
...t end with 'abc'.
In your case you have searched by '%_%'. This will give all the rows with that column having one or more characters, that means any characters, as its value. This is why you are getting all the rows even though there is no _ in your column values.
...
Add a prefix to all Flask routes
...tant to the route at every definition. Is there a way to do this automatically?
10 Answers
...
Which method performs better: .Any() vs .Count() > 0?
...le<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() does check for ICollection<T> (using .Count as an optimisation) - so if your underlying data-sou...
What's the UIScrollView contentInset property for?
... answered Dec 31 '09 at 1:21
jballjball
23.1k88 gold badges6464 silver badges9191 bronze badges
...