大约有 19,000 项符合查询结果（耗时：0.0360秒） [XML]
Python list iterator behavior and next(iterator)
...in a:
... print(i)
... _ = next(a)
...
0
2
4
6
8
or print extra information to differentiate the print() output from the interactive interpreter echo:
>>> a = iter(list(range(10)))
>>> for i in a:
... print('Printing: {}'.format(i))
... next(a)
...
Printing: 0
1
Pr...
Create RegExps on the fly using string variables
...
And omit the / regex delimiters when using this form too.
– cdhowie
Dec 6 '10 at 22:28
add a comment
|
...
What are the options for storing hierarchical data in a relational database? [closed]
...tion for 1,000 Nodes = 00:00:00:870
Duration for 10,000 Nodes = 00:01:01:783 (70 times slower instead of just 10)
Duration for 100,000 Nodes = 00:49:59:730 (3,446 times slower instead of just 100)
Duration for 1,000,000 Nodes = 'Didn't even try this'
And here's the duration for the new ...
Python datetime to string without microsecond component
...ency with the UTC time strings returned elsewhere, the desired format is 2011-11-03 11:07:04 (followed by +00:00 , but that's not germane).
...
Rails: Using build with a has_one association in rails
...en write accepts_nested_attributes_for :profile this in User model. and in form which user is being created write <%= f.simple_fields_for :profile do |p| %> this and go on.
– zeal
May 16 '15 at 6:22
...
Span inside anchor or anchor inside span or doesn't matter?
...
It is perfectly valid (at least by HTML 4.01 and XHTML 1.0 standards) to nest either a <span> inside an <a> or an <a> inside a <span>.
Just to prove it to yourself, you can always check it out an the W3C MarkUp Validation Service
I tried val...
Blocks and yields in Ruby
...zling at first.
In Ruby, methods may receive a code block in order to perform arbitrary segments of code.
When a method expects a block, it invokes it by calling the yield function.
This is very handy, for instance, to iterate over a list or to provide a custom algorithm.
Take the following ...
Diff output from two programs without temporary files
...
For anyone curious, this is how you perform process substitution in using the Fish shell:
Bash:
diff <(./a) <(./b)
Fish:
diff (./a | psub) (./b | psub)
Unfortunately the implementation in fish is currently deficient; fish will either hang or use a tem...
JavaScript regex multiline flag doesn't work
...
For performance issues, it is highly recommended to use the *? quantifier instead of * in order to avoid greediness. This will avoid catching the last <h1> of the document: that's probably not what you want and that's not effi...
How to format current time using a yyyyMMddHHmmss format?
...
Use
fmt.Println(t.Format("20060102150405"))
as Go uses following constants to format date,refer here
const (
stdLongMonth = "January"
stdMonth = "Jan"
stdNumMonth = "1"
stdZeroMonth = "01"
stdLongWeekDay ...