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The condition object provided by Python provides support for complex thread synchronization issues. condition is called a conditional variable and provides the wait and notify methods in addition to the acquire and release methods similar to lock. The thread first acquire a condition variable and then determines some conditions. Wait if the condition is not met, and if the condition is met, after some proce
1. Assigning values to variablesLetters are quoted as strings, not labeled as variable names." Jbzhang " = nameprint="jbz"print(name2)Memory Reclamation: The memory space created, when there is no variable pointing, the memory space will be emptied or deleted directly.Like what:1. Delete directlyAge=21Del age2. Cancel the pointAge=22Age=232.if Statement Implementation guess ageAge_of_princal= + = Int (input (">>:"))if guess_age = = age_of_princal: Print ("yes,you got it. " Else: print("n
#!/usr/bin/env python#-*-Coding:utf-8-*-age = 3if age >= 18:print ' adult ' elif age >= 6:print ' teenager ' Else:prin T ' Kid ' print '----------------------' names = [' Jie ', ' Bob ', ' Trcy ']for name in Names:print nameprint '------------------- -----' sum = 0for x in [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]:sum = sum + xprint sumprint u '-----------range (integer generation)---------------- ' Sum = 0for x in range (101): sum = sum + xprint sumprint u '--
Height=input ("Please input your height,eg.:1.75") Weight=input ("Please input your weight") H=int (height) W=int (weight) BMI =w/h**2 If BMI Elif bmiPrint ("normal")Elif BMI Print ("Over weight")Elif BMI Print ("obese")Else Print ("Too fat") A few things to note: The first is the problem with the operator h^2 is represented in Python as h**2 ElseIf in Python for Elif, written ElseIf will error, EIF
This article mainly introduced the Python tuple operation method, combined with the concrete instance form to analyze the python's creation, assignment, update, deletion and other operation methods and related considerations, the need for friends can refer to the following The examples in this article describe Python tuple operations. Share to everyone for your
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
Cases:if 1=1, then it will output "Hello World" otherwise Output "Hello penphy" Code block:1 if Conditions: 2 Print("helloWorld")3else:4 ("Error")Note:The indent below the if is also a space, which represents the code block below if. (Indentation is not correct, will be error)1 if 1 = = 1 :2 print("helloWorld")3 Else:4 print ("hello penphy" ) The 1=1 condition is true, so the second line of code is executed otherwise the condition does not hold the code of line fourth1 if1 =
First, if the use of several information1. If basic statementIf 1==1: print (' OK ') #缩进四个字符, you can press the TAB key else: print (' Error ') If 1 = = 1: Print (' A1 ') print (' A2 ') print (' End ') 2.if nestingif1 = = 1: if2 = = 2: Print('A1') Print('A2') Else: Print('A3')Else: Print('A4')3.if elifINP = input ('Please input INP:')ifINP = ='A1' : Print('B1')elifINP = ='A2': Print('B2')elifINP = ='A3': Print('B3')Else: Print('B4')4. Use
1. Judgment and CirculationPython indentMainPrint ("Hello")Print ("Hello world.")if 判断条件: 执行语句elif 判断条件: 执行语句else: 执行语句while 判断条件: 执行语句a = 100while a>1: print(a) a-=1 if a==50: break # 退出循环 if a==55: print("5555555555") continue # 此次循环结束，进入下一个循环Break jumps out of the loopContinue into the next cyclefor item in sequence： 执行语句l = ["a","b","c","d","e","f"]print(l[:])print(l[0:5]) # 大于等于0 小于5 0 2, the programming idea is the most importa
data structure ( It's like sitting on a table for two people, and two people on the table is shared ); When re-assigning, the new memory is re-opened to store the value of the variable, and the address of the memory is stored in the variable. (the equivalent of a person on the table was moved to another table to eat)Second, copy:In Python, we sometimes save a piece of data and then process it, and this time Pytho
There are 6 types of replication syntax in PythonBasic Form' spam 'Tuple Assignment' spam ' ' Ham 'List Assignmen>>>[spam, ham] = ['spam'ham']Sequence Assignment' spam 'Extended sequence Unpacking (Python 3.X)>>>a, *b ='spam'>>>a's'>>>b#b The result of the assignment is a list['P','a','m']>>>a, *b, C ='spam'>>>a's'>>>b
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 =
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:InstanceImportCopy a= [1, 2, 3, 4, ['a','b']]#Original Objectb = A#assignment, a reference to a passing objectc = Copy.copy (a)#object Copy, shallow copyD = Copy.deepcopy (a)#object Copy, deep copyA.append (5)#Modify Object AA[4].append ('C')#Modify the [' A ', ' B '] Array obj
This article mainly introduces the assignment, shortest, and deep copy methods in Python. Python also includes simple assignment, shortest, and deep copy methods, for more information about how to copy data, see the following methods in Python: Simple
This article mainly introduces how to deeply parse the variables and value assignment operators in Python. It is a basic knowledge in getting started with Python. For more information, see Python variable type The value of the variable stored in the memory. This means that a space is opened in the memory when a variabl
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= '
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
In Python, when we make a variable equal to another variable, it does not pass the value to it, but instead directly changes the address to the point. We want to see the address of a variable in memory, which can be viewed by ID (variable). Let's take a look at this interesting process through a small example. >>> x = 12>>> y= 13>>> ID (x) 1865402384>>> ID (y) 1865402416>>> x = y>> Gt ID (x) 1865402416>>> ID (y) 1865402416 The first
Python learning notes enumerate () and range (len) usage and assignment subtotal, pythonenumerate #! /Uer/bin/env python # _ * _ coding: UTF-8 _ * _ # format 1a = 'abc' for I in range (len ()): print a [I], '(% d)' % I A (0)B (1)C (2) # Format 2for A, I in enumerate ('abc'): print I, A 0B 1C 2 # Format 2.1b = raw_input ('wartyouname: ') for I, j in enumerate
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