大约有 40,000 项符合查询结果（耗时：0.0309秒） [XML]
Python argparse: default value or specified value
...e default and since I need to do some ops, I have something like this self.foo = (args.bar or some_else_source).upper(). It will break on None object AFAIUC.
– 0andriy
Aug 12 '19 at 14:02
...
How to set variables in HIVE scripts
...em variables as well, so you can reference ${env:USER} for example.
To see all the available variables, from the command line, run
% hive -e 'set;'
or from the hive prompt, run
hive> set;
Update:
I've started to use hivevar variables as well, putting them into hql snippets I can include from hi...
How to use string.replace() in python 3.x
... The "re" (regular expression) module has alternatives for (some? all?) deprecated string functions. In this case, re.sub().
– ToolmakerSteve
Dec 13 '13 at 22:19
9
...
Restful way for deleting a bunch of items
...because you don't need any redirects. Incorporating AJAX you could do this all without leaving the page.
– rojoca
Mar 15 '10 at 19:40
...
Error: “dictionary update sequence element #0 has length 1; 2 is required” on Django 1.4
...stance, the following functions throw the error from the question:
url(r'^foo/(?P<bar>[A-Za-z]+)/$', views.FooBar.as_view(), 'foo')
path('foo/{slug:bar}/', views.FooBar, 'foo')
But these actually work:
url(r'^foo/(?P<bar>[A-Za-z]+)/$', views.FooBar.as_view(), name='foo')
path('foo/{s...
Replace one character with another in Bash
.... Example:
foo=" "
# replace first blank only
bar=${foo/ /.}
# replace all blanks
bar=${foo// /.}
See http://tldp.org/LDP/abs/html/string-manipulation.html for more details.
share
|
improve th...
What's the scope of the “using” declaration in C++?
...
... which is generally a bad thing.
– Catskul
Feb 16 '11 at 5:25
17
...
variable === undefined vs. typeof variable === “undefined”
...
For undeclared variables, typeof foo will return the string literal "undefined", whereas the identity check foo === undefined would trigger the error "foo is not defined".
For local variables (which you know are declared somewhere), no such error would occu...
Iterate over object keys in node.js
Since Javascript 1.7 there is an Iterator object, which allows this:
5 Answers
5
...
JavaScript regex multiline flag doesn't work
...ipt 2018.
https://github.com/tc39/proposal-regexp-dotall-flag
const re = /foo.bar/s; // Or, `const re = new RegExp('foo.bar', 's');`.
re.test('foo\nbar');
// → true
re.dotAll
// → true
re.flags
// → 's'
share
...