python array assignment

In this section, we'll expand the variable assignment in detail.1. Below we give examples of various assignmentsAnint=12anfloat=2.2anstr= ' string ' alist=[' a ', ' a ', ' a ']anarray= (all-in-all) Amap={1: ' A ', 2: ' B ', 3: ' C ',}2. Chained assignment3. Increment assignment, i.e. self-increment or self-reduction, etc.These operators: +=,-=,*=,/=,%=,**=,>>=,X+=1x=x+1x*=14. Multi-value AssignmentUsing tup

B completely copy the parent object and its child objects, both are completely independent.More examplesThe following examples are copy.copy (shallow copy) and (copy.deepcopy) using the Copy module:Instance 1234567891011121314151617 #!/usr/bin/python# -*-coding:utf-8 -*-importcopya=[1,2,3,4, [‘a‘,‘b‘]]#原始对象b= a#赋值，传对象的引用c=copy.copy(a)#对象拷贝，浅拷贝d=copy.deepcopy(a)#对象拷贝，深拷贝a.append(5)#修改对象aa[4].append(‘c‘)#修改对象a中的[‘a‘, ‘b‘]数组对象print(‘a =

y two parameters and assigns a value to the Self objectself.x =x self.y=ydefReset (self):#move to a specific locationself.move (0, 0)#accepts another point object as input, returns the distance defcalculate_distance (Self, other_point):returnmath.sqrt ((self.x-Other_point.x) * * 2 +(Self.y-OTHER_POINT.Y) * * 2)#How to use itPoint1 =Point () Point2=Point () Point1.reset () Point2.move (5, 0)Print(Point2.calculate_distance (point1))#5.0#assert is a simple test tool, and if the following statem

is assigned to BSimilarly:This sequence extension package is valid for all sequence typesNote that there is a boundary condition where Python automatically assigns an empty value to an item that is out of boundsIt is also important to note that the * symbol can only have one, and only one variable is not available *>>> a,*b,*c,d,*e= ' ABCD ' Syntaxerror:two starred expressions in assignment>>> a,b,c,d,e= '

When assigning values between objects in Python is passed by reference, the copy module in the standard library is required if the object needs to be copied.1. Copy.copy a shallow copy copies only the parent object and does not copy the inner sub-objects of the object.2. Copy.deepcopy deep copy Copy object and its sub-object Program:Import copy a = [1, 2, 3, 4, [' A ', ' B ']] #原始对象 b = A #赋值, reference to the object C = copy.copy (a) #对象拷贝, shal

Like many languages, Python is divided into simple assignments, shallow copies, and deep copies of these "copy" methods.In the learning process, the initial understanding of the shallow copy is very vague. But after a series of experiments, I found that the concepts of these three are further understood.First, assign a value　　The assignment is the most common of the three operations, and we analyze the

Assignment is also an operatorWe have learned in previous chapters that variables in Python are not required to be declared, as long as the variable's identity conforms to the law, it can be directly defined and assigned, and Python allows us to assign values to multiple variables at the same time (including assigning different types of values to multiple variabl

One #mutable ALi = [12,12,342,4] - Print(ID (LI)) -Li.append (12) the Print(ID (LI)) - - #a new list -Li = [12,123,213,123,123] + Print(ID (LI))1094336010943008140417189762736140417373204184140417198413960140417198413960140417198537224As can be seen, when the object is immutable, re-assignment, the address has changed, that is, rebind "paste" to the new value up.When the object is variable, such as the list in the previous example, after appending

Python Variable Type The value that the variable is stored in memory. This means that there is a space in memory when creating variables. Based on the data type of the variable, the interpreter allocates the specified memory and determines what data can be stored in memory. Therefore, variables can specify different data types, which can store integers, decimals, or characters. Assigning values to variablesVariables in

This time to bring you a Python variable assignment of the step-by-bit details, the Python variable assignment of attention to what, the following is the actual case, together to see. >>> x = 12>>> y= 13>>> ID (x) >>> ID (y) >>> x = y>>> ID (x) >>> ID (y) The first assignment