python print dictionary pretty

#defaultprint "PI =%f"% math.pi#width = 10,precise = 3,align = leftprint "PI =%10.3f"% Math.pi#width = 10,p Recise = 3,align = rigthprint "PI =%-10.3f"% math.pi# front padding character print "PI =%06d"% int (math.pi) #输出结果 #pi = 3.141593#pi = 3.142#pi = 3.142#PI = 000003# The format of the floating-point number, accuracy, degree, and 　　4. Format the output string (string)#precise = 3print "%.3s"% ("Jcodeer") #precise = 4print "%.*s"% (4, "

DescribeThe Python Dictionary (Dictionary) SetDefault () function is similar to the Get () method, and if the key does not already exist in the dictionary, the key is added and the value is set to the default value.GrammarSetDefault () method syntax:Dict. SetDefault(key,default=None) Parameters Key--Th

DescribeThe Python dictionary (Dictionary) get () function returns the value of the specified key if the value does not return a default value in the dictionary.GrammarGet () method syntax:Dict. Get(key,default=None) Parameters Key--The keys to find in the dictionary. Default-Returns the default va

Python self-study day-Two day (2)-python-list-tuples-dictionary, python- ListFormat: name = []Name = [name1, name2, name3, name4, name5] # List operations Name. index ("name1") # query the name of the specified value. count ("name1") # query the name of the total number of specified values. clear ("name") # clear the l

#-*-encoding=utf-8-*-import operator #按字典值排序 (default 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 sorte d_x = sorted (X.iteritems (), Key=operator.itemgetter (1), reverse=true) print sorted_x #[(3, 4), (4, 3), (1, 2), (2, 1), ( 0, 0)] #或者直接使用list的rever

Python Dictionary (Dictionary) copy () method descriptionThe Python dictionary (Dictionary) copy () function returns a shallow copy of a dictionary.GrammarCopy () method syntax:Dict. Copy() Parameters NA. return va

dictionary and uses them to test the The example then assigns the value assigned to the variable D1 to the dictionary of the other variable D2. Note that the built-in ID () method returns the same identifier value for D1 and D2, which means that this is not a copy operation. To copy dictionary, you can use the copy () method. As you can see from the last lines

#!/usr/bin/env python #-*-coding:utf-8-*- # 1, Scenario 1: Using built-in functions sorted from random import randint d = {X:rand Int (m) for x in ' Xadfyz '} # Converts a dictionary to a list containing tuples, using the ZIP function results such as: [(b, ' a '), (E, ' d '), (+, ' F '), (+, ' Y '), ($, ' X '), (+, ' z ')] # result = Zip (D.values (), D.keys ()) Result = Zip (D.itervalues (), D.keys ())

Python Data Type _ tuples, common dictionary operations (Introduction), python Data Types Tuples 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 elements i

Python basics 2-dictionary, python2-dictionary Dictionary Dictionary is another variable container model that can store any type of objects. Each key-value (key => value) pair of the dictionary uses the colon (:), And each pair is

1. Dictionary definition, key unique, value arbitrarydic={key0:value0,key1:value1}2. Outputprint(dic[key0])>>:value03. Traversing a dictionary3.1keys () traverse the key in the dictionarydic={‘name‘:‘zhangsan‘,‘age‘:20}for k in dic.keys(): print(k)>>:nameage 3.2values () traverse the value in the dictionarydic={‘name‘:‘zhangsan‘,‘age‘:20}for v in dic.values():

1. Dictionary: in Python, a dictionary is a series of key-value pairs. Each key is associated with a value, and you can use the key to access the value associated with it. The values associated with the key can be numbers, strings, lists, and dictionaries. You can actually use any Python object as a value in the dictio

also the unique ing type in Python. In a ing object, the hash value (key, key) has a one-to-many relationship with the object (value, value), which is generally considered a variable hash table. 2. dictionary operations (1) Create an empty dictionary Dict = {} (2) create a non-empty dictionary Dict = {key1: value1, ke

The dictionary turns out to be the same thing.Python learns now, and we already know that lists can come in handy if you want to group values into structures and reference them by number. Today, however, we will learn a data structure that references values by name, and we should know that this type of data is called mapping. The dictionary is the only built-in mapping type in

Python dictionary, pythonThis article mainly introduces the dictionary in python, which is one of the most powerful data types in Python, this article explains what is a dictionary, how to create a

list, we can use the for statement. Review: >>> person_list = ["qiwsir","Newton","Boolean"] >>> for name in person_list:... print name... qiwsirNewtonBoolean So can dict be cyclically accessed using the for statement? Of course, let's look at the example: >>> person{'name2': 'qiwsir', 'name': 'qiwsir', 'language': 'python', 'site': 'qiwsir.github.io'}>>> for key in person:...

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'} 3 # p