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Combine two or more columns in a dataframe into a new column with a new name
...t for example is like: A - B instead of A-B. Is it possible to remove this extra space?
– Chetan Arvind Patil
Oct 6 '17 at 2:35
9
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Initialize a byte array to a certain value, other than the default null? [duplicate]
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var array = Encoding.ASCII.GetBytes(new string(' ', 100));
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How to import an excel file in to a MySQL database
... to import spreadsheet data into a MySQL database that doesn't rely on any extra software. Let's assume you want to import your Excel table into the sales table of a MySQL database named mydatabase.
Select the relevant cells:
Paste into Mr. Data Converter and select the output as MySQL:
Change...
INSERT with SELECT
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22 and '22' should not matter to sql, but I put a string in case that the field is similar to an unique identifier.
– Dumitrescu Bogdan
Mar 22 '11 at 12:54
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keytool error :java.io.IoException:Incorrect AVA format
...on at all. This was corrected by setting the option to a validly formatted string.
this command failed with the AVA format exception: (line breaks added for legibility)
C:\Program Files\Java\jdk1.6.0_45\jre\bin>keytool
-genkey -v -dname PatrickTaylor -validity 10000
-keystore C:\drops\patrick...
Android: Difference between Parcelable and Serializable?
...Parcelable;
public class MyObjects implements Serializable {
private String name;
private int age;
public ArrayList<String> address;
public MyObjects(String name, int age, ArrayList<String> address) {
super();
this.name = name;
this.age = age;
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Getting a structural type with an anonymous class's methods from a macro
...an instance of a structural type with the named member. */
def bar(name: String): Any = macro bar_impl
def bar_impl(c: Context)(name: c.Expr[String]) = {
import c.universe._
val anon = TypeName(c.freshName)
// next week, val q"${s: String}" = name.tree
val Literal(Constant(s: St...
Is it possible to implement a Python for range loop without an iterator variable?
...'myapplication')
_ = gettext.gettext
# ...
print _('This is a translatable string.')
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How to change colors of a Drawable in Android?
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If you want to use a color resource rather than a string (#ff0000 etc), you can use e.g. int iColor = getResources().getColor(R.color.primary)
– Ben Clayton
Aug 20 '14 at 15:02
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Fastest way to copy file in node.js
...eReadStream/createWriteStream method working for some reason, but using fs-extra npm module it worked right away. I am not sure of the performance difference though.
fs-extra
npm install --save fs-extra
var fs = require('fs-extra');
fs.copySync(path.resolve(__dirname,'./init/xxx.json'), 'xxx.jso...