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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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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...
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...
accepting HTTPS connections with self-signed certificates
...ultHostnameVerifier(hostnameVerifier);
// Example send http request
final String url = "https://encrypted.google.com/";
HttpPost httpPost = new HttpPost(url);
HttpResponse response = httpClient.execute(httpPost);
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UnmodifiableMap (Java Collections) vs ImmutableMap (Google) [duplicate]
...ns for those who only have the reference to the unmodifiable view:
Map<String, String> realMap = new HashMap<String, String>();
realMap.put("A", "B");
Map<String, String> unmodifiableMap = Collections.unmodifiableMap(realMap);
// This is not possible: It would throw an
// Unsup...
Comparing two strings, ignoring case in C# [duplicate]
...MHO the more efficient one, since the second 'solution' instantiates a new string instance.
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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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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...
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;
...
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...