python 2 7 dictionary

Python Day 1-getting started with common operations on the Python (4) dictionary, python Day 1 1 # dic = {[123, 3]: '000000'} # variable types cannot be used as Dictionary keys. value can be of any type 2 # dic = {(, 4 ): '000000'

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

My Python self-learning Path 3: tuples and dictionary learning summary, the path to python 1. tuples 1. the Python tuples are similar to the list, except that the elements of the tuples cannot be modified. The tuples use parentheses, And the list uses square brackets. Creating tuples is simple. You only need to add ele

. str (dict): Output dictionary printable strings. 4. type (variable): return the input variable type. If the variable is a dictionary, the dictionary type is returned. The Python dictionary contains the following built-in methods: 1. radiansdict. clear (): delete all elemen

Baptism of the soul, cultivation of python (8)-efficient dictionary, baptism of pythonThe core of python-Dictionary (dict) 1. What is a dictionary? Have you used dictionaries in the student age? You can use a dictionary to find th

First, generate a random dictionary:From random import RandintD={x:randint (60,99) for x in "ABCDEFG"} # {' A ': +, ' B ': $, ' C ': "All, ' d ':", ' e ': ", ' F ': $, ' G ': 88}In the first way, the subclasses of collections are sorted from large to small counter:From collections Import CounterD={x:randint (60,99) for x in "ABCDEFG"}C=counter (d). Most_common () #返回一个列表, in accordance with the value of dict from large to small sort [(' B ', '), (' G ', "), (' d ',"), (' E ', "), (' A '," five

#-*-Encoding=utf-8-*- Import operator #按字典值排序 (the default is ascending) x = {1:2, 3:4, 4:3, 2:1, 0:0} sorted_x = sorted (X.iteritems (), Key=operator.itemgetter (1)) Print sorted_x #[(0, 0), (2, 1), (1, 2), (4, 3), (3, 4)] #如果要降序排序, you can specify Reverse=true sorted_x = sorted (X.iteritems (), Key=operator.itemgett

appear twice. If the same key is assigned twice during creation, the last value will be remembered as follows: The code is as follows: #! /Usr/bin/pythonDict = {'name': 'Zara ', 'age': 7, 'name': 'manni '};Print "dict ['name']:", dict ['name'];# Output result of the above instance:# Dict ['name']: Manni 2) the key must be unchangeable. Therefore, you can use numbers, strings, or tuples to act as the key.

== 0: return 'zero'elif arg == 1: return 'one'elif arg == 2: return "two"else: return "nothing" Good data = { 0: "zero", 1: "one", 2: "two",}data.get(arg, "nothing") 7. Use iteritems to iterate the elements in the dictionary Python provides several methods to iterate the el

Do you still remember to learn the Python dictionary from old Qi ?, Qi xue python Dictionary. Are you still using this item? With the development of the network, fewer and fewer users are used. Many people are used to searching on the Internet, not only the web version, but also the various dictionaries of the mobile v

value of the element 7 list.remove (obj) Remove the first occurrence of a value in a list 8 list.reverse () Reverse list elements 9 list.sort ([func]) Sort the original list tuple ===========================================================A python tuple is similar to a list in that its elements cannot be modified and use

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