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Python: Check if one dictionary is a subset of another larger dictionary
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Convert to item pairs and check for containment.
all(item in superset.items() for item in subset.items())
Optimization is left as an exercise for the reader.
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What exception classes are in the standard C++ library
...at are included in the standard C++ library, and what should they be used for? I know there are a few new C++11 exceptions, but I'm not sure what they are or where they are.
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Why switch is faster than if
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@fivetwentysix: No, refer to this for info: artima.com/underthehood/flowP.html . Quote from article: When the JVM encounters a tableswitch instruction, it can simply check to see if the key is within the range defined by low and high. If not, it takes the defa...
What is ASP.NET Identity's IUserSecurityStampStore interface?
... in ASP.NET), I came across this interface when implementing my own UserStore :
3 Answers
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Difference between dispatch_async and dispatch_sync on serial queue?
...spatch_async return after it is added to the queue and may not finished.
for this code
dispatch_async(_serialQueue, ^{ printf("1"); });
printf("2");
dispatch_async(_serialQueue, ^{ printf("3"); });
printf("4");
It may print 2413 or 2143 or 1234 but 1 always before 3
for this code
dispatch_sync...
How to set NODE_ENV to production/development in OS X
For use in express.js environments. Any suggestions?
14 Answers
14
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not None test in Python [duplicate]
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if val is not None:
# ...
is the Pythonic idiom for testing that a variable is not set to None. This idiom has particular uses in the case of declaring keyword functions with default parameters. is tests identity in Python. Because there is one and only one instance of None...
Do I need a content-type header for HTTP GET requests?
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According to the RFC 7231 section 3.1.5.5:
A sender that generates a message containing a payload body SHOULD generate a Content-Type header field in that message unless the intended media type of the enclosed representation...
Update my github repo which is forked out from another project [duplicate]
I have forked out a Parent: project to Child: this . Now, I want to update my child with parents current updates. Can I do that, if yes how?
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How can one check to see if a remote file exists using PHP?
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You can instruct curl to use the HTTP HEAD method via CURLOPT_NOBODY.
More or less
$ch = curl_init("http://www.example.com/favicon.ico");
curl_setopt($ch, CURLOPT_NOBODY, true);
curl_exec($ch);
$retcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
// $retcode >= 400 -> not found, $retcode = ...