大约有 43,000 项符合查询结果（耗时：0.0682秒） [XML]
How to compare two colors for similarity/difference
... You can find the conversion formulas here: brucelindbloom.com/index.html?Equations.html
– Guillermo Gutiérrez
Nov 14 '13 at 19:36
4
...
Django-DB-Migrations: cannot ALTER TABLE because it has pending trigger events
...ng. If you use south, see: south.readthedocs.org/en/latest/tutorial/part3.html and if you use django's migrations, see the "data migrations" section here: docs.djangoproject.com/en/1.8/topics/migrations
– mgojohn
Jul 29 '15 at 0:23
...
How to convert local time string to UTC?
...tc)
for details see:
see: https://blog.ganssle.io/articles/2019/11/utcnow.html
original answer (from 2010):
The datetime module's utcnow() function can be used to obtain the current UTC time.
>>> import datetime
>>> utc_datetime = datetime.datetime.utcnow()
>>> utc_dateti...
Regular expression to match DNS hostname or IP Address?
....linuxinsight.com/how_to_grep_for_ip_addresses_using_the_gnu_egrep_utility.html
egrep '([[:digit:]]{1,3}\.){3}[[:digit:]]{1,3}'
Though the case doesn't account for values like 0 in the fist octet, and values greater than 254 (ip addres) or 255 (netmask). Maybe an additional if statement would hel...
Can someone explain collection_select to me in clear, simple terms?
... that you can pass. These are documented here, under the heading Options.
html_options : Whatever is passed here, is simply added to the generated html tag. If you want to supply a class, id, or any other attribute, it goes here.
Your association could be written as:
collection_select(:user, :pla...
Set margin size when converting from Markdown to PDF with pandoc
...ted an RMarkdown file in RStudio and managed to knit it with knitr into an HTML and .md file. Next, I used pandoc to convert the .md file into a PDF file (I get an error if I try and convert from the .html file). However, the PDF that is produced have massive margins (like this http://johnmacfarl...
Will Dart support the use of existing JavaScript libraries?
...ive is reserved for the core libraries of dartc (dart:core, dart:dom, dart:html, dart:json, etc), which itself compiles to javascript.
share
|
improve this answer
|
follow
...
Flex-box: Align last row to grid
...
Add a ::after which autofills the space. No need to pollute your HTML. Here is a codepen showing it: http://codepen.io/DanAndreasson/pen/ZQXLXj
.grid {
display: flex;
flex-flow: row wrap;
justify-content: space-between;
}
.grid::after {
content: "";
flex: auto;
}
...
In CMake, how can I test if the compiler is Clang?
...tive matching it is not possible cmake.org/pipermail/cmake/2017-May/065432.html
– fferri
Dec 8 '17 at 18:02
add a comment
|
...
How to sort objects by multiple keys in Python?
...f x > y.
https://portingguide.readthedocs.io/en/latest/comparisons.html#the-cmp-function
"""
return (x > y) - (x < y)
def multikeysort(items, columns):
comparers = [
((i(col[1:].strip()), -1) if col.startswith('-') else (i(col.strip()), 1))
for col in colu...