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Safest way to convert float to integer in python?
...ss than or equal to 224 can be exactly represented in the single precision format, and any integer with absolute value less than or equal to 253 can be exactly represented in the double precision format.
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ORA-12505, TNS:listener does not currently know of SID given in connect descriptor
... and run ALTER SYSTEM REGISTER. Then exit from SQL*Plus and try the first form again.
If the third one fails but the second one works, add your user account to the ora_dba group. Do this in Control Panel > Computer Management > Local Users and Groups.
Once you can get connections of the fo...
Difference between hard wrap and soft wrap?
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soft : The text in the textarea is not wrapped when submitted in a form. This is default
hard : The text in the textarea is wrapped (contains newlines) when submitted in a form. When "hard" is used, the cols attribute must be specified
Reference: W3Schools
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Trying to start a service on boot on Android
...ces
adb in ADT by default you can find in:
adt-installation-dir/sdk/platform-tools
Enjoy! )
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How to create a new file together with missing parent directories?
...cludes parent directories, i.e. if you are certain that the path is of the form <parent-dir>/<file-name>.
If it does not, i.e. it is a relative path of the form <file-name>, then getParentFile() will return null.
E.g.
File f = new File("dir/text.txt");
f.getParentFile().mkdirs()...
Is Python strongly typed?
...ly typed language, where types are entirely disjoint and only a controlled form of overloading is possible via type classes.
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Is a statically-typed full Lisp variant possible?
...te, let's take a look at the list structure itself, called the cons, which forms the primary building block of Lisp.
Calling the cons a list, though (1 2 3) looks like one, is a bit of a misnomer. For example, it's not at all comparable to a statically typed list, like C++'s std::list or Haskell's ...
Get cookie by name
... I set up a jsperf test for the offered solutions: jsperf.com/getcookie-performance . Performance strongly differs between browsers.
– sborn
Oct 16 '19 at 14:31
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How can I view the source code for a function?
...nv") for currently available ones.
The output already offers a lot of information. standardGeneric is an indicator of an S4 function. The method to see defined S4 methods is offered helpfully:
> showMethods(chol2inv)
Function: chol2inv (package base)
x="ANY"
x="CHMfactor"
x="denseMatrix"
x="d...
Index on multiple columns in Ruby on Rails
...at the beginning. i.e. if you index on [:user_id, :article_id], you can perform a fast query on user_id or user_id AND article_id, but NOT on article_id.
Your migration add_index line should look something like this:
add_index :user_views, [:user_id, :article_id]
Question regarding 'unique' ...