Tutorial by Examples: e

The Problem You have a set of things to do (activities). Each activity has a start time and a end time. You aren't allowed to perform more than one activity at a time. Your task is to find a way to perform the maximum number of activities. For example, suppose you have a selection of classes to ch...

Numbers have four types in Python. Int, float, complex, and long. int_num = 10 #int value float_num = 10.2 #float value complex_num = 3.14j #complex value long_num = 1234567L #long value

String are identified as a contiguous set of characters represented in the quotation marks. Python allows for either pairs of single or double quotes. Strings are immutable sequence data type, i.e each time one makes any changes to a string, completely new string object is created. a_str = 'Hello ...

A list contains items separated by commas and enclosed within square brackets [].lists are almost similar to arrays in C. One difference is that all the items belonging to a list can be of different data type. list = [123,'abcd',10.2,'d'] #can be a array of any data type or single data type. li...

Lists are enclosed in brackets [ ] and their elements and size can be changed, while tuples are enclosed in parentheses ( ) and cannot be updated. Tuples are immutable. tuple = (123,'hello') tuple1 = ('world') print(tuple) #will output whole tuple. (123,'hello') print(tuple[0]) #will outp...

Dictionary consists of key-value pairs.It is enclosed by curly braces {} and values can be assigned and accessed using square brackets[]. dic={'name':'red','age':10} print(dic) #will output all the key-value pairs. {'name':'red','age':10} print(dic['name']) #will output only value with 'nam...

In the following, weight is declared as a mutable field. type person = { name: string; mutable weight: int };; Remark: As far as design is concerned here, one would consider the fact that a person's name isn't likely to change, but their weight is.

Initializing a record with mutable fields isn't different from a regular record initialization. let john = { name = "John"; weight = 115 };;

To assign a new value to a mutable record field, use the <- operator. john.weight <- 120;; Note: The previous expression has a unit type.

You can use BETWEEN clause to replace a combination of "greater than equal AND less than equal" conditions. Data +----+-----------+ | id | username | +----+-----------+ | 1 | admin | | 2 | root | | 3 | toor | | 4 | mysql | | 5 | thanks | | 6 | java ...

Generally tf.gather gives you access to elements in the first dimension of a tensor (e.g. rows 1, 3 and 7 in a 2-dimensional Tensor). If you need access to any other dimension than the first one, or if you don't need the whole slice, but e.g. only the 5th entry in the 1st, 3rd and 7th row, you are b...

Starting with version 2.7 ElementTree has a better support for XPath queries. XPath is a syntax to enable you to navigate through an xml like SQL is used to search through a database. Both find and findall functions support XPath. The xml below will be used for this example <Catalog> &l...

Build the documentation for existent doc source with specified source doc directory and where to be built like following: sphinx-build -b html source build

On the machine where you'd like to make the backup, jump to the Redis CLI: redis-cli Password? If your master Redis DB (the one you want to replicate) has a password: config set masterauth <password> Start replication Run the following to begin replication: SLAVEOF <host> <...

/* creates a database for Alfresco, on SQLServer 2008- 2014 */ use master; GO CREATE DATABASE alfresco; GO /* creates a new LOGIN and associated User use alfresco; GO CREATE LOGIN alfresco WITH PASSWORD = 'alfresco'; GO use alfresco; go CREATE USER alfresco FOR LOGIN alfresco; GO ...

This example is used in specifying options that might not be included in a database of available housing and its attendant amenities. It builds on the previous example, with some differences: Two procedures are no longer necessary for a single combo box, done by combining the code into a single ...

A simple way to catch unhandled errors (exceptions) in a VFP application is to use the ON ERROR command near the beginning of your main program. The following ON ERROR command calls a method in the current program called "errorHandler". The values returned by ERROR (the VFP Error Number),...

The Java Cryptography Extension (JCE) is a framework built into the JVM to allow developers to easily and securely use cryptography in their programs. It does this by providing a simple, portable interface to programmers, while using a system of JCE Providers to securely implement the underlying cry...

While the JCE secures cryptographic operations and key generation, it is up to the developer to actually manage their keys. More information needs to be provided here. One commonly-accepted best practice for handling keys at runtime is to store them only as byte arrays, and never as strings. This i...

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