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Python: Convert timedelta to int in a dataframe
...olumn. Is it possible to use 'datetime.days' or do I need to do something more manual?
4 Answers
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How should one use std::optional?
...ount,
std::optional<double> min_match_score);
This makes a lot more sense than, say, having four function overloads that take every possible combination of max_count (or not) and min_match_score (or not)!
It also eliminates the accursed "Pass -1 for max_count if you don't want a limit" ...
How do I find out which keystore was used to sign an app?
... the -jarfile argument was introduced in Java 7; see the documentation for more details.)
Signature of a keystore
keytool -list -v -keystore release.jks
The output will reveal the aliases (entries) in the keystore file release.jks, with the certificate fingerprints (MD5, SHA1 and SHA256).
If th...
Return Boolean Value on SQL Select Statement
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@robertpeter07 - The two are equivalent, but * is more idiomatic. See this question.
– Chad
Mar 13 '15 at 15:12
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What uses are there for “placement new”?
...e-allocate memory each time you need a new instance. Instead, it might be more efficient to perform a single allocation for a chunk of memory that can hold multiple objects, even though you don't want to use all of it at once.
DevX gives a good example:
Standard C++ also supports placement
new ope...
SOAP vs REST (differences)
...s easier to ascertain if the contract is being followed.
A REST client is more like a browser. It's a generic client that knows how to use a protocol and standardized methods, and an application has to fit inside that. You don't violate the protocol standards by creating extra methods, you leverage...
What is the difference between the remap, noremap, nnoremap and vnoremap mapping commands in Vim?
...p and :nnoremap), one in visual mode (:vmap and :vnoremap) and so on.
For more guidance on this, see:
:help :map
:help :noremap
:help recursive_mapping
:help :map-modes
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Why does Java's hashCode() in String use 31 as a multiplier?
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Java: Multiple class declarations in one file
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How to correctly implement custom iterators and const_iterators?
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