Python - What does `if __name__ == "__main__":` do? 11.13. sqlite3 — DB-API 2.0 interface for SQLite databases. SQLite is a C library that provides a lightweight disk-based database that doesn’t require a separate server process and allows accessing the database using a nonstandard variant of the SQL query language. Some applications can use SQLite for internal data storage. It’s also possible to prototype an application using SQLite and then port the code to a larger database such as PostgreSQL or Oracle. The sqlite3 module was written by Gerhard Häring. It provides a SQL interface compliant with the DB-API 2.0 specification described by PEP 249. To use the module, you must first create a Connection object that represents the database. Here the data will be stored in the example.db file: import sqlite3conn = sqlite3.connect('example.db') You can also supply the special name :memory: to create a database in RAM.
Once you have a Connection, you can create a Cursor object and call its execute() method to perform SQL commands: The data you’ve saved is persistent and is available in subsequent sessions: SQLite Python tutorial. This is a Python programming tutorial for the SQLite database. It covers the basics of SQLite programming with the Python language. You might also want to check the Python tutorial, SQLite tutorial or MySQL Python tutorial or PostgreSQL Python tutorial on ZetCode.
Prerequisites To work with this tutorial, we must have Python language, SQLite database, pysqlite language binding and the sqlite3 command line tool installed on the system. If we have Python 2.5+ then we only need to install the sqlite3 command line tool. . $ python Python 2.7.3 (default, Jan 2 2013, 16:53:07) [GCC 4.7.2] on linux2 Type "help", "copyright", "credits" or "license" for more information.
>>> import sqlite3 >>> sqlite3.version '2.6.0' >>> sqlite3.sqlite_version '3.7.13' In the shell, we launch the Python interactive interpreter. Now we are going to use the sqlite3 command line tool to create a new database. We provide a parameter to the sqlite3 tool; test.db is a database name. Version #! Import sqlite3 as lite #! #! #! #! SQLite Python Tutorial. Installation The SQLite3 can be integrated with Python using sqlite3 module which was written by Gerhard Haring. It provides an SQL interface compliant with the DB-API 2.0 specification described by PEP 249. You do not need to install this module separately because its being shipped by default along with Python version 2.5.x onwards. To use sqlite3 module, you must first create a connection object that represents the database and then optionally you can create cursor object which will help you in executing all the SQL statements.
Python sqlite3 module APIs Following are important sqlite3 module routines, which can suffice your requirement to work with SQLite database from your Python program. Connecting To Database Following Python code shows how to connect to an existing database. . #! Here you can also supply database name as the special name :memory: to create a database in RAM. $chmod +x sqlite.py $. Create a Table #! Opened database successfully Table created successfully INSERT Operation #!
#! SQLite Python Tutorial. Create MySQLdb database using Python script. Python3 Tutorial: Formatted Output. Three Ways for a Nicer Output In this chapter of our Python tutorial we will have a closer look at the various ways of creating nicer output in Python. We present all the different ways, but we recommend that you should use the format method of the string class, which you will find at end of the chapter.
"string format" is by far the most flexible and Pythonic approach. So far we have used the print function in two ways, when we had to print out more than two values: The easiest way, but not the most elegant one:We used print with a comma separated list of values to print out the results, as we can see in the following example. All the values are separated by blanks, which is the default behaviour. The Old Way or the non-existing printf and sprintf Is there a printf in Python? The following diagram depicts how the string modulo operator works: The format string contains placeholders.
The general syntax for a format placeholder is %[flags][width][.precision]type Examples: center(...) Oracle SQL Return Single Row Based On Max Value of a Column. SQL MAX() Function. SQLite Python tutorial. Python-sql - Python library to write SQL queries. SQL INSERT INTO Statement. Query Language: INSERT. Small. Fast. Reliable.Choose any three. [Top] insert-stmt: expr: literal-value: raise-function: type-name: signed-number: select-stmt: common-table-expression: compound-operator: join-clause: join-constraint: join-operator: ordering-term: result-column: table-or-subquery: with-clause: cte-table-name: The INSERT statement comes in three basic forms.
The first form (with the "VALUES" keyword) creates one or more new rows in an existing table. The optional conflict-clause allows the specification of an alternative constraint conflict resolution algorithm to use during this one INSERT command. The optional "database-name. " prefix on the table-name is support for top-level INSERT statements only.
Python MySQL Database Access. The Python standard for database interfaces is the Python DB-API. Most Python database interfaces adhere to this standard. You can choose the right database for your application. Python Database API supports a wide range of database servers such as − GadFlymSQLMySQLPostgreSQLMicrosoft SQL Server 2000InformixInterbaseOracleSybase Here is the list of available Python database interfaces: Python Database Interfaces and APIs .You must download a separate DB API module for each database you need to access. The DB API provides a minimal standard for working with databases using Python structures and syntax wherever possible. Importing the API module.Acquiring a connection with the database.Issuing SQL statements and stored procedures.Closing the connection We would learn all the concepts using MySQL, so let us talk about MySQLdb module. What is MySQLdb? MySQLdb is an interface for connecting to a MySQL database server from Python.
How do I Install MySQLdb? #! Database Connection Example #! #! #! #! #! #! #! 11.13. sqlite3 — DB-API 2.0 interface for SQLite databases — Python 2.7.9 documentation. HowTo/Sorting. Original version by Andrew Dalke with a major update by Raymond Hettinger Python lists have a built-in sort() method that modifies the list in-place and a sorted() built-in function that builds a new sorted list from an iterable. There are many ways to use them to sort data and there doesn't appear to be a single, central place in the various manuals describing them, so I'll do so here. Sorting Basics A simple ascending sort is very easy -- just call the sorted() function. It returns a new sorted list: >>> sorted([5, 2, 3, 1, 4]) [1, 2, 3, 4, 5] You can also use the list.sort() method of a list.
>>> a = [5, 2, 3, 1, 4] >>> a.sort() >>> a [1, 2, 3, 4, 5] Another difference is that the list.sort() method is only defined for lists. Key Functions Starting with Python 2.4, both list.sort() and sorted() added a key parameter to specify a function to be called on each list element prior to making comparisons. For example, here's a case-insensitive string comparison: Operator Module Functions. Cryptography. Simple GUI Programming | Using Python. IYOCGwP, Chapter 9 - Hangman. Topics Covered In This Chapter: · Multi-line Strings · Methods · Lists · The append() and reverse() list methods · The lower(), upper(), split(), startswith(), and endswith() string methods · The in and not in operators · The range() and list() functions · del statements · for loops · elif statements This chapter’s game introduces many new concepts, but don’t worry.
Source Code of Hangman This chapter’s game is a bit longer than the previous games, but much of it is the ASCII art for the hangman pictures. Hangman.py 1. import random 59. words = 'ant baboon badger bat bear beaver camel cat clam cobra cougar coyote crow deer dog donkey duck eagle ferret fox frog goat goose hawk lion lizard llama mole monkey moose mouse mule newt otter owl panda parrot pigeon python rabbit ram rat raven rhino salmon seal shark sheep skunk sloth snake spider stork swan tiger toad trout turkey turtle weasel whale wolf wombat zebra'.split() 61. def getRandomWord(wordList): 64. return wordList[wordIndex] 68. print() 97. else: e. Hangman | Code? Boom.