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How do I check if a list is empty?
...“recommended” and No means “not recommended”):
For sequences, (strings, lists, tuples), use the fact that empty sequences are false.
Yes: if not seq:
if seq:
No: if len(seq):
if not len(seq):
sh...
Callback when CSS3 transition finishes
...tion(){ ... });
Note that you can pass all of the browser prefixed event strings into the bind() method simultaneously to support the event firing on all browsers that support it.
Update:
Per the comment left by Duck: you use jQuery's .one() method to ensure the handler only fires once. For exam...
Checking if a double (or float) is NaN in C++
...em -finput-charset=windows-1252
@g++ -O -pedantic -std=c++98 -Wall -Wwrite-strings %* -Wno-long-long
C:\test> gnuc x.cpp
C:\test> a && echo works... || echo !failed
works...
C:\test> gnuc x.cpp --fast-math
C:\test> a && echo works... || echo !failed
Assertion failed: ...
Getting pids from ps -ef |grep keyword
...rep "keyword" to determine the pid of a daemon process (there is a unique string in output of ps -ef in it).
6 Answers
...
jQuery deferreds and promises - .then() vs .done()
...gle callback and will filter out non-functions (though there is a bug with strings in version 1.8 that should be fixed in 1.8.1):
// this will add fn1 to 7 to the deferred's internal callback list
// (true, 56 and "omg" will be ignored)
promise.done( fn1, fn2, true, [ fn3, [ fn4, 56, fn5 ], "omg", ...
How do I create a datetime in Python from milliseconds?
...time_in_millis / 1000.0, tz=datetime.timezone.utc)
Converting datetime to string following the RFC3339 standard (used by Open API specification):
from rfc3339 import rfc3339
converted_to_str = rfc3339(dt, utc=True, use_system_timezone=False)
# 2020-08-04T11:58:05Z
...
Razor doesn't understand unclosed html tags
... public static class MyRenderHelpers
{
public static MvcHtmlString Html(this HtmlHelper helper, string html, bool condition)
{
if (condition)
return MvcHtmlString.Create(html);
else
return MvcHtmlString.Empty;
}
...
Gets byte array from a ByteBuffer in java
...];
b1.get(hello); // "Hello "
ByteBuffer b2 = b1.slice(); // position = 0, string = "World"
byte[] tooLong = b2.array(); // Will NOT be "World", but will be "Hello World".
byte[] world = new byte[5];
b2.get(world); // world = "World"
Which might not be what you intend to do.
If you really do not ...
What can I do with a moved-from object?
... May-be should be a separate question, but does that mean: if I have a string with char* buffer; and int length; members, then my move constructor/assignment must swap (or set) the value of both? Or would it be OK, if the length was unspecified (meaning that empty and size return meaningless val...
Using Moq to mock an asynchronous method for a unit test
...anger
.Setup(x => x.GetCredentialsAsync(It.IsAny<string>()))
.ReturnsAsync(new Credentials() { .. .. .. });
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