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Create an empty list in python with certain size
...ect. So unless you simply want 10 copies of the same object, use the range based variant as it creates 10 new objects. I found this distinction very important.
– Mandeep Sandhu
Apr 23 '18 at 18:29
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How to drop rows of Pandas DataFrame whose value in a certain column is NaN
... Actually, the specific answer would be: df.dropna(subset=['EPS']) (based on the general description of Aman, of course this does also work)
– joris
Apr 23 '14 at 12:53
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Suppress warning messages using mysql from within Terminal, but password written in bash script
...allows you to have multiple config files - for different servers/roles/databases. Using ~/.my.cnf will only allow you to have one set of configuration (although it may be a useful set of defaults).
If you're on a Debian based distro, and running as root, you could skip the above and just use /etc/my...
Append an object to a list in R in amortized constant time, O(1)?
...n performance. For example, the by_index solution, a very popular solution based on the frequency with which I find it in other SO posts, took 11.6 milliseconds to append 2000 objects, and 953 milliseconds to append ten times that many objects. The overall problem's time grew by a factor of 100, so ...
Operator overloading in Java
... own operators which act in the same way though.
For a Java-like (and JVM-based) language which does support operator overloading, you could look at Kotlin or Groovy. Alternatively, you might find luck with a Java compiler plugin solution.
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Should I initialize variable within constructor or outside constructor [duplicate]
When I use Java based on my C++ knowledge, I love to initialize variable using the following way.
11 Answers
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How to annotate MYSQL autoincrement field with JPA annotations
...nt to give the generator, "myschema" is the name of the schema in your database that contains the sequence object, and "mysequence" is the name of the sequence object in the database.
@GeneratedValue(strategy= GenerationType.SEQUENCE, generator="MySequenceGenerator")
@SequenceGenerator(allocationSi...
Cannot change version of project facet Dynamic Web Module to 3.0?
... I also had to do this. I was using a Spring web project with a Java-based configuration, so updating a web.xml wasn't possible for me.
– bcody
Apr 6 '14 at 13:12
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Error while installing json gem 'mkmf.rb can't find header files for ruby'
...lation fails.
I would suggest you to install ruby-dev (ruby-devel for rpm-based distros) package onto you target machine.
gcc package might be needed as well.
Try:
$ sudo apt-get install ruby-dev
Or, for Redhat distro:
$ sudo yum install ruby-devel
Or, for [open]SuSE:
$ sudo zypper install...
Remove duplicates from an array of objects in JavaScript
...I had this exact same requirement, to remove duplicate objects in a array, based on duplicates on a single field. I found the code here: Javascript: Remove Duplicates from Array of Objects
So in my example, I'm removing any object from the array that has a duplicate licenseNum string value.
var a...