fixed amount of time between requests, but uses a random interval between 0.5 * DOWNLOAD_DELAY and 1.5 * DOWNLOAD_DELAY. When CONCURRENT_REQUESTS_PER_IP is non-zero, delays are enforced per ip address Default: True If enabled, Scrapy will wait a random amount of time (between 0.5 * DOWNLOAD_DELAY and 1.5 * DOWNLOAD_DELAY) while fetching requests from the same website. This randomization decreases the support was added in Scrapy 1.1. PyPy support was added in Scrapy 1.4, PyPy3 support was added in Scrapy 1.5. Note: For Python 3 support on Windows, it is recommended to use Anaconda/Miniconda as outlined in

Scrapy 1.5 documentation This documentation contains everything you need to know about Scrapy. Getting help Having trouble? We’d like to help! Try the FAQ – it’s got answers to some common questions fixed amount of time between requests, but uses a random interval between 0.5 * DOWNLOAD_DELAY and 1.5 * DOWNLOAD_DELAY. When CONCURRENT_REQUESTS_PER_IP is non-zero, delays are enforced per ip address Default: True If enabled, Scrapy will wait a random amount of time (between 0.5 * DOWNLOAD_DELAY and 1.5 * DOWNLOAD_DELAY) while fetching requests from the same website. This randomization decreases the

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 1.5 Database . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . https://groups.google.com/group/peewee-orm 18 Chapter 1. Contents: peewee Documentation, Release 3.5.0 1.5 Database The Peewee Database object represents a connection to a database. The Database class is instantiated Extensions • SQLite Extensions • Sqlcipher backend • apsw, an advanced sqlite driver • SqliteQ 1.5. Database 19 peewee Documentation, Release 3.5.0 1.5.1 Initializing a Database The Database initialization

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 1.5 Query Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . for other people to find. • Ask on the mailing list, https://groups.google.com/group/peewee-orm 1.5 Query Examples These query examples are taken from the site PostgreSQL Exercises. A sample data-set membercost = MoneyField() guestcost = MoneyField() initialoutlay = MoneyField() (continues on next page) 1.5. Query Examples 19 peewee Documentation, Release 3.3.0 (continued from previous page) monthlymaintenance

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 1.5 Query Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . for other people to find. • Ask on the mailing list, https://groups.google.com/group/peewee-orm 1.5 Query Examples These query examples are taken from the site PostgreSQL Exercises. A sample data-set membercost = MoneyField() guestcost = MoneyField() initialoutlay = MoneyField() (continues on next page) 1.5. Query Examples 19 peewee Documentation, Release 3.4.0 (continued from previous page) monthlymaintenance

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 1.5 Database . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . for other people to find. • Ask on the mailing list, https://groups.google.com/group/peewee-orm 1.5 Database The Peewee Database object represents a connection to a database. The Database class is instantiated Peewee Database parameter. To set this value, simply pass in charset alongside your other values: 1.5. Database 19 peewee Documentation, Release 3.6.0 db = MySQLDatabase('database_name', user='www-data'

Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 1.5 Contributing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . an Encrypted Command-Line Diary. 16 Chapter 1. Contents: peewee Documentation, Release 2.10.2 1.5 Contributing In order to continually improve, Peewee needs the help of developers like you. Whether database-related tasks with peewee. Throughout this document we will use the following example models: 1.5. Contributing 17 peewee Documentation, Release 2.10.2 from peewee import * class User(Model): username

data: class Sample(Model): key = TextField() value = FloatField() data = ( ('a', (1.25, 1.5, 1.75)), ('b', (2.1, 2.3, 2.5, 2.7, 2.9)), ('c', (3.5, 3.5))) # Populate data. for key, values subclass of Database. names – A list of names to use as the scheme in the URL, e.g. ‘sqlite’ or ‘firebird’ Register additional database class under the specified names. This function can be used to extend database class for Firebird named FirebirdDatabase. from playhouse.db_url import connect, register_database register_database(FirebirdDatabase, 'firebird') db = connect('firebird://my-firebird-db') Connection

subclass of Database. names – A list of names to use as the scheme in the URL, e.g. ‘sqlite’ or ‘firebird’ Register additional database class under the specified names. This function can be used to extend database class for Firebird named FirebirdDatabase. from playhouse.db_url import connect, register_database register_database(FirebirdDatabase, 'firebird') db = connect('firebird://my-firebird-db') CSV Utils

subclass of Database. names – A list of names to use as the scheme in the URL, e.g. ‘sqlite’ or ‘firebird’ Register additional database class under the specified names. This function can be used to extend database class for Firebird named FirebirdDatabase. from playhouse.db_url import connect, register_database register_database(FirebirdDatabase, 'firebird') db = connect('firebird://my-firebird-db') Connection