Tutorial by Examples: io

A DataFrame can be created from a list of dictionaries. Keys are used as column names. import pandas as pd L = [{'Name': 'John', 'Last Name': 'Smith'}, {'Name': 'Mary', 'Last Name': 'Wood'}] pd.DataFrame(L) # Output: Last Name Name # 0 Smith John # 1 Wood Mary Missin...
Shall the property value's assignment be executed before or after the class' constructor? public class TestClass { public int TestProperty { get; set; } = 2; public TestClass() { if (TestProperty == 1) { Console.WriteLine("Shall this be e...
Sonarqube uses database for storing its results and analysis. You can install MySQL for example and run it using mysql -u root -p and then run the following queries to set up the database tables. CREATE DATABASE sonar CHARACTER SET utf8 COLLATE utf8_general_ci; CREATE USER 'sonar' IDENTIFIED BY 's...
Interpolation means that Perl interpreter will substitute the values of variables for their name and some symbols (which are impossible or difficult to type in directly) for special sequences of characters (it is also known as escaping). The most important distinction is between single and double qu...
The "right-left" rule is a completely regular rule for deciphering C declarations. It can also be useful in creating them. Read the symbols as you encounter them in the declaration... * as "pointer to" - always on the left side [] as "array of" ...
In order to get started, you just need to install the Unity nuget package. Run the following command from the package manager console: PM> Install-Package Unity Alternatively, you can use Visual Studio to install Unity on a particular project using the Manage NuGet Packages for Solution opti...
You could use "SP_HELPINDEX Table_Name", but Kimberly Tripp has a stored procedure (that can be found here), which is better example, as it shows more about the indexes, including columns and filter definition, for example: Usage: USE Adventureworks EXEC sp_SQLskills_SQL2012_helpindex ...
A simple PL/pgSQL function: CREATE FUNCTION active_subscribers() RETURNS bigint AS $$ DECLARE -- variable for the following BEGIN ... END block subscribers integer; BEGIN -- SELECT must always be used with INTO SELECT COUNT(user_id) INTO subscribers FROM users WHERE subscribed...
You can iterate over the contents of a dictionary with dict for, which is similar to foreach: set theDict {abcd {ab cd} bcde {ef gh} cdef {ij kl}} dict for {theKey theValue} $theDict { puts "$theKey -> $theValue" } This produces this output: abcd -> ab cd bcde -> ef gh c...
Sometimes you need to match a literal (sub-)string with a regular expression despite that substring containing RE metacharacters. While yes, it's possible to write code to insert appropriate backslashes to make that work (using string map) it is easiest to just prefix the pattern with ***=, which ma...
This is a minimal possible XSLT transformation. It produces the string value of the source XML document. The output format is text. Source XML document: <t>Hello, World!</t> XSLT transformation: <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/T...
If you don't have Visual Studio 2015, go to https://www.visualstudio.com/en-us/downloads/download-visual-studio-vs.aspx and select Visual Studio Community. It is a free version that have all the required capabilities to develop Windows 10 application. You can install the Enterprise Edition if you ha...
You can override the default vmoptions with your own personal settings by choosing Help > Edit Custom VM Options from the toolbar. This will create a local copy of the file which you are free to edit. For example, if you double the value set for Xmx, the maximum size of the memory allocation poo...
This example shows the base of almost any XSLT transformation and the most fundamental XSLT design pattern. Producing as output an XML document that is identical to the source XML document. Source XML document: <t>Hello, World!</t> XSLT transformation: <xsl:stylesheet version=&q...
C++11 During exception handling there is a common use case when you catch a generic exception from a low-level function (such as a filesystem error or data transfer error) and throw a more specific high-level exception which indicates that some high-level operation could not be performed (such as b...
A downcast can be used to make use of a subclass's code and data inside of a function taking a parameter of its superclass. class Rat { var color = "white" } class PetRat: Rat { var name = "Spot" } func nameOfRat(🐭: Rat) -> String { guard let petRat = ...
In the following code let us assume for simplicity that float and uint32_t have the same size. void fun(uint32_t* u, float* f) { float a = *f *u = 22; float b = *f; print("%g should equal %g\n", a, b); } u and f have different base type, and thus the compiler can a...
Detailed instructions on getting seaborn set up or installed.
If we have two pointer arguments of the same type, the compiler can't make any assumption and will always have to assume that the change to *e may change *f: void fun(float* e, float* f) { float a = *f *e = 22; float b = *f; print("is %g equal to %g?\n", a, b); } f...
Detailed instructions on getting MarkLogic set up or installed can be found in the Installation Guide. The full offering of documentation is available via docs.marklogic.com The overall setup process involves Installing the binary/rpm Starting the services Configuring first and subsequent host...

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