python conditional assignment

, you bastard, write a bunch of things we all know. Come on, I want a refund. Then I'm here to say that the refund is not back AH.How to write a good variable?Let me cite one more example:x = "CoXieQqun"y = "725479218"z = x + y print(z)The result of the operation is:CoXieQqun725479218I don't know if you can read it, look at the variable and the value of the variable, if you don't look at the value of the variable, such as:xxx = "CoXieQqun"xxx = "725479218"Do you know what a variable is?As y

) When you assign a value to an object (either as a parameter or as a return value), Python, like Java, always passes a reference to the original object, not a copy. Other languages always pass a copy when assigning values. Python never guesses the user's needs if you want a copy , you must explicitly ask for it. The behavior of Python is simple, fast, and co

This article brings you a brief introduction to the assignment shallow copy deep copy of Python (example), has certain reference value, the friend who needs can refer to, hope to be helpful to you. When writing the dict data type, there are references to the "assignment statement" and the copy () function.In fact, when it comes to shading, you need to consider

This article mainly introduces the value assignment operator in Python, which is a basic skill in Python. if you need it, refer to the following table to list the value assignment operators supported by all Python languages. Assume that variable a holds 10 and variable B hol

Python dict dictionary and some examples of value assignment reference (detailed description), pythondict Recently, I am working on a very large database that needs to be searched by numerical value. So I thought of the dictionary in python, and I have never used dict. List and tuple are the most commonly used) I have read the following method to create a diction

Yesterday I want to do a Python function in the number of send statistics, need to use global variables, as follows1COUNT =02 3 defsendonelinemsg (producer, listfromline):4Acsnstr =Listfromline[0]5Macstr = listfromline[1]6Onlinetimestr = listfromline[2]7msg = {'Clientmac': Macstr,'ACSN': Acsnstr,'Onlinetime': Onlinetimestr}8MSGSTR =json.dumps (msg)9 producer.produce (MSGSTR)TenCOUNT + = 1The error is reported, and the workaround is to add a row to the

The python empty dictionary list has different effects on the assignment. Recently, Naive Bayes has encountered an interesting phenomenon (based on Python3.6.3) I generate a list composed of 10 empty dictionaries: FirstGeneration Method (most people may use this method, which is simple) > A = [{}] * 10 However, a problem occurs when assigning values to the dictionary in. > A [3] [3] = 32 > [{3: 32 },{3: 32

#-*-Coding:utf-8-*-#Author David"""Feature Description: Write the Login interfaceEnter user name and passwordShow welcome message after successful authenticationThree-time error after locking"""#用户信息表user = "David"passwd = "123456"unlock = 1Error_count = 0"""defining function bodiesFunction Description:1) When the user enters the user name, the first to determine whether the existence, if there is the next judgment, if not present, prompt for the user name.2) When the user name exists, the syste

The following assumes variable A is 10 and variable B is:"=" is to assign the right value to the left variable .Example 1 : Programming Implementation 145893 Seconds is a few days a few hours a few minutes a few seconds? Total = 145893Day = Total // ( - * - * -)hour = ( Total % ( - * - * -)) // ( -* -)minute = ( Total % ( - * -)) // -second = Total % -Print("%dseconds to%ddays,%dhours,%dminutes,%dseconds" % ( Total, Day , Hour, minute, second))Example 2 : the user input Chinese, math

1, >>> myteacher = ' big ' >> Yourteacher = Myteacher>> myteacher = ' small '>> Print (Yourteacher)→bigWrong answer: Myteacher 2, >>> first = 100 >> second = ' 100 '>> first = Second>> Print (first)→100Wrong answer: ' 100 ' 3, in addition to the escape, there is no way >>STR = "Let ' s go!">>print (str)→let ' s go!Double quotes and three quotation marks ("" "..." "" ") can contain single quotes, and three quotation marks (" ... ") can contain double quotes without escaping

>>> spam, ham = ' yum ', ' yum '>>> spam' Yum '>>> Ham' YUM '>>> [spam, Ham] = [' yum ', ' yum ']>>> [spam, Ham][' Yum ', ' yum ']>>> a,b,c,d = ' spam '>>> A' s '>>> b' P '>>> CA>>> D' m '>>> A, *b = ' spam '>>> A' s '>>> b[' P ', ' a ', ' m ']>>> spam = Ham = ' Lunch '>>> spam' Lunch '>>> Ham' Lunch 'python-Assignment Value

There are three ways to assign a Python variable;1. Direct assignment: Age = 282. Multiple variable assignment age, sex = 1 #每个变量都必须要有个对应的值3. Special form Assignment A = b = 28Note that variables must be assigned before they are used, which differs from C + + because there is no type modifier in front of the

)Print(' Lst1: ' + Str(LST1)+ '; ID: ' + Str(ID(LST1)))Print(' Lst2: ' + Str(LST2)+ '; ID: ' + Str(ID(LST2))) Lst2.pop ()Print(' Lst1: ' + Str(LST1)+ '; ID: ' + Str(ID(LST1)))Print(' Lst2: ' + Str(LST2)+ '; ID: ' + Str(ID(LST2)))First, create a list object Lst1, and let both Lst2 and Lst1 point to the same list. The following append operations and pop operations, whether for Lst1 or lst2, are in fact the same list. Two variables all point to the same list, the action on either variable will affe

: Assignment is to assign the address of an object to a variable, so that the variable points to that address (old bottles of old wine). A shallow copy creates a new variable or container in another address, but the address of the element within the container is a copy of the address of the element of the source object. This means that the new container points to the old element (new bottle of old wine). A deep copy is a new variable