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What are “named tuples” in Python?
...
from typing import NamedTuple
class ANamedTuple(NamedTuple):
"""a docstring"""
foo: int
bar: str
baz: list
The above is the same as the below, except the above additionally has type annotations and a docstring. The below is available in Python 2+:
>>> from collections i...
Select all elements with “data-” attribute without using jQuery
....querySelector(`[data-foo="${i}"]`)
Note even if you don't write value in string it gets converted to string like if I write
<div data-foo=1></div>
and then inspect the element in Chrome developer tool the element will be shown as below
<div data-foo="1"></div>
You can als...
How do I use shell variables in an awk script?
...k:
echo "input data" | awk 'BEGIN {print var}' var="${variable}"
Here-string
Variable can also be added to awk using a here-string from shells that support them (including Bash):
awk '{print $0}' <<< "$variable"
test
This is the same as:
printf '%s' "$variable" | awk '{print $0}'
...
discuz插件开发新手入门 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...成1后 工具->清理缓存 然后刷新下页面就出现好多 类似string global_usernav_extra1的东西 这就是锚点，也是插件可以利用的点。
好了下面开始做插件：
后台 ->应用 ->设计新插件
提交后 请在插件管理中 启用即可
然后点击 设计...
How do I get bash completion to work with aliases?
... The command used in the alias
# $3: The arguments in the alias all in one string
# Generate a wrapper completion function (completer) for an alias
# based on the command and the given arguments, if there is a
# completer for the command, and set the wrapper as the completer for
# the alias.
functio...
How does Apple know you are using private API?
...hree20-based apps last few months.)
3. Listing Objective-C selectors, or strings
Objective-C selectors are stored in a special region of the binary, and therefore Apple could extract the content from there, and check if you've used some undocumented Objective-C methods, such as -[UIDevice setOrie...
Why should I use Deque over Stack?
...et or SortedMap).
We may use the preferred style of declaring like Set<String> set = new HashSet<String>();see reasons here.
But Stack class: 1) don't have its own interface; 2) is a subclass of Vector class - which is based on resizable array; so where is linked list implementation o...
How can I get the current date and time in UTC or GMT in Java?
...stance of Calendar which uses the local timezone, or possibly using Date.toString() which also uses the local timezone, or a SimpleDateFormat instance, which, by default, also uses local timezone.
If this isn't the problem, please post some sample code.
I would, however, recommend that you use Jod...
Adding additional data to select options using jQuery
...ction(){
var selected = $(this).find('option:selected');
var extra = selected.data('foo');
...
});
});
// Plain old JavaScript
var sel = document.getElementById('select');
var selected = sel.options[sel.selectedIndex];
var extra = selected.getAttribute('data-foo');
See t...
MPICH vs OpenMPI
Can someone elaborate the differences between the OpenMPI and MPICH implementations of MPI ?
Which of the two is a better implementation ?
...