declare dictionary python

Describes the concepts and usage of ing type (dictionary) Operators in Python, and python operators. Ing Type Operator (1) standard operators The dictionary can work with all standard type operators, but it does not support operations such as concatenation and repetition. These operations are meaningful to the sequence

Dictionary dict:A dictionary is actually the equivalent of a map in Java to store key-value pairs. The data stored in it is unordered.If there is such a data:t1=[' name ', ' age ', ' sex 't2=[' Tom ', ' Male 'by Zip (t1,t2) you can get to such data [(' Name ', ' Tom '), (' Age ', ' + '), (' Sex ', ' male ')]The dictionary definition is done through {}.A

Pythondictionary (Dictionary)A dictionary is another mutable container model and can store any type of object.Each key value of the dictionary is key=>value with a colon : Split, with a comma, split between each key-value pair, and the entire dictionary is enclosed in curly braces {}, as shown in the following format:

This article mainly introduces the Python dict dictionary structure operation method learning notebook, the dictionary operation is the basic knowledge in the Python getting started learning, for more information about how to learn about Python dict

I. dictionary creation method ①: amp; gt; dict1 {} amp; gt; amp; gt; dict2 {name: earth, port: 80} amp; gt; dict1, dict2 ({}, {port: 80, name: earth}) method ②: from Python2.2 amp; gt; fdictdict ([x, 1], [1. create a dictionary Method ①: >>> Dict1 = {} >>> Dict2 = {'name': 'Earth ', 'port': 80} >>> Dict1 and dict2 ({},{ 'Port': 80, 'name': 'global '}) Method 2: Start with

Python dictionary introduction and Usage Details #!/usr/bin/env python# -*- coding:utf-8 -*-""" Old Rules: Environment 2.7.x in the following method. Please remember the print format (the output content should be placed in parentheses) for users of version 3.x or later) Basic composition and usage of dictionaries dict = { key : value }dict[ key ] = value First, t

code is as follows: >>> d={' title ': ' Python Web Site ', ' url ': ' http://www.python.org ', ' spam ': 0}>>> D.items ()[(' url ', ' http://www.python.org '), (' spam ', 0), (' title ', ' Python Web Site ')] The Iteritems method works roughly the same, but returns an iterator object instead of a list: The code is as follows: >>> It=d.iteritems ()>>> it >>> List (IT) [(' url ', ' http://www.py

I. Creating a dictionary Method ①: >>> Dict1 = {} >>> dict2 = {' name ': ' Earth ', ' Port ': 80} >>> Dict1, Dict2 ({}, {' Port ': +, ' name ': ' Earth '}) Method ②: From Python version 2.2 >>> fdict = Dict ([' X ', 1], [' Y ', 2]) >>> fdict {' Y ': 2, ' X ': 1} Method ③: From the Python 2.3 version, you can create a "default"

A dictionary is the only built-in ing type in python. The values in the dictionary have no special order, but they are all stored in a specific key. A dictionary is the only built-in ing type in python. The values in the dictionary