Tutorial by Examples: io

from collections import Counter c = Counter(["a", "b", "c", "d", "a", "b", "a", "c", "d"]) c # Out: Counter({'a': 3, 'b': 2, 'c': 2, 'd': 2}) c["a"] # Out: 3 c[7] # not in the list (7 oc...

Counting the keys of a Mapping isn't possible with collections.Counter but we can count the values: from collections import Counter adict = {'a': 5, 'b': 3, 'c': 5, 'd': 2, 'e':2, 'q': 5} Counter(adict.values()) # Out: Counter({2: 2, 3: 1, 5: 3}) The most common elements are avaiable by the m...

Anonymous functions are functions that are defined but not assigned a name. The following is an anonymous function that takes in two integers and returns the sum. (x: Int, y: Int) => x + y The resultant expression can be assigned to a val: val sum = (x: Int, y: Int) => x + y Anonymous...

A very simple way to import data from many common file formats is with rio. This package provides a function import() that wraps many commonly used data import functions, thereby providing a standard interface. It works simply by passing a file name or URL to import(): import("example.csv&quot...

A dictionary is an example of a key value store also known as Mapping in Python. It allows you to store and retrieve elements by referencing a key. As dictionaries are referenced by key, they have very fast lookups. As they are primarily used for referencing items by key, they are not sorted. crea...

The $_SESSION variable is an array, and you can retrieve or manipulate it like a normal array. <?php // Starting the session session_start(); // Storing the value in session $_SESSION['id'] = 342; // conditional usage of session values that may have been set in a previous session if(!i...

You can concatenate std::strings using the overloaded + and += operators. Using the + operator: std::string hello = "Hello"; std::string world = "world"; std::string helloworld = hello + world; // "Helloworld" Using the += operator: std::string hello = "Hel...

Use Case CASE can be used in conjunction with SUM to return a count of only those items matching a pre-defined condition. (This is similar to COUNTIF in Excel.) The trick is to return binary results indicating matches, so the "1"s returned for matching entries can be summed for a count o...

Common values from both sets: You can use the intersect(_:) method to create a new set containing all the values common to both sets. let favoriteColors: Set = ["Red", "Blue", "Green"] let newColors: Set = ["Purple", "Orange", "Green"] ...

Counter is a dict sub class that allows you to easily count objects. It has utility methods for working with the frequencies of the objects that you are counting. import collections counts = collections.Counter([1,2,3]) the above code creates an object, counts, which has the frequencies of all ...

collections.defaultdict(default_factory) returns a subclass of dict that has a default value for missing keys. The argument should be a function that returns the default value when called with no arguments. If there is nothing passed, it defaults to None. >>> state_capitals = collections.d...

Function overloading is having multiple functions declared in the same scope with the exact same name exist in the same place (known as scope) differing only in their signature, meaning the arguments they accept. Suppose you are writing a series of functions for generalized printing capabilities, b...

The datepicker is used to show an interactive date selector which is tied to a standard form input field. It makes selecting of date for input tasks very easy and also it is also highly configurable. Any input field can be bound with jquery-ui datepicker by the input field's selector (id,class etc....

To get the physical size of the screen (including window chrome and menubar/launcher): var width = window.screen.width, height = window.screen.height;

To determine the color and pixel depths of the screen: var pixelDepth = window.screen.pixelDepth, colorDepth = window.screen.colorDepth;

Standard Collections Java Collections framework A simple way to construct a List from individual data values is to use java.utils.Arrays method Arrays.asList: List<String> data = Arrays.asList("ab", "bc", "cd", "ab", "bc", "cd"); ...

The following is handy to have in build logs that identifies the build machine, and some parameters; simply make you main task depend on this task to print it before every build. <!-- Print Environment Info --> <target name="environment"> <!-- Get the current ti...

Mathematical operations on values other than numbers return NaN. "a" + 1 "b" * 3 "cde" - "e" [1, 2, 3] * 2 An exception: Single-number arrays. [2] * [3] // Returns 6 Also, remember that the + operator concatenates strings. "a" + "b&...

Generally, Math functions that are given non-numeric arguments will return NaN. Math.floor("a") The square root of a negative number returns NaN, because Math.sqrt does not support imaginary or complex numbers. Math.sqrt(-1)

WordPress [WP] is an open source Content Management System for building apps, websites, and blogs. WP is written in PHP and uses MySQL as the data store for the user content and configuration. It has a rich ecosystem of plugins and themes and enjoys a vibrant open source community, good documentatio...