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$ cat script1.py #!/usr/bin/env Python3 print ( Code class= "Bash string" > ' Hello World ' ) $ Python3 >>> import script1 # after the first import operation is complete, the file hello World >>> import script1 # The second import does not execute >>>
Because of an expensive operation at import time, each file, each program can not be repeated more than once. The import must find the file, compile it into bytecode, and run
multiprocessing Import Process 2 import OS 3 import time 4 5 def info (name): 6 Print ("Name:", name) 7 PR Int (' Parent process: ', Os.getppid ()) #获取父进程的id号 8 print (' Process ID: ', os.getpid ()) #获取当前进程pid 9 Print ("------------------") Time.sleep (5) One-if __name__ = = ' __main__ ': + info (' main process ') # The first time to get the process of the IDE tool and the process of the code file is p1 = Processes (Target=info, args= (' Alvin ',)) #该代码文
:#coding =utf-8Import OSOs.system (' e:\\test_object\\all_test.py ')OrImport OSOs.chdir ("E:\\test_object")Os.system (' Python all_test.py ')-----------------
All files under the directory can be obtained by Os.listdir ()
Through Os.path.getmtime (path) #返回在此path下最后一次修改的时间
Connecting directories and filenames via os.path.join (path, name)
#coding =utf-8Import OS#定义文件目录Result_dir = ' E:\\test_object\\report 'Lists=os.listdir (Resu
Class: A collection of objects that describe an object with the same properties and methods, which defines the properties and methods that are common to each object in the collection. An object is an instance of a class.Object: an instance of a data structure defined by a class. Object consists of two data members (class variables and instance variables) and methodsClass variables: Class variables are common throughout the instantiated object. Class variables are defined in the class and outside
computer are in the same LAN > phone setup agent > The weak-net Python foundation that simulates a phone
Python cannot use the variable name:
[' and ', ' as ', ' assert ', ' Break ', ' class ', ' Continue ', ' Def ', ' del ', ' elif ', ' Else ', ' except ', ' exec ', ' finally ', ' for ', ' From ', ' global ', ' if ', ' Import ', ' on ', ' is ', '
actually activate the Python interpreter and tell the interpreter: You're going to start working. But before the "explain", the first thing that actually executes is the same as Java, which is compiled.Students familiar with Java can consider how we execute a Java program on the command line:Javac Hello.javaJava HelloJust when we were using an IDE like Eclipse, we fused these two parts into a piece. In fact, Pyth
followed by comment: 2 space +#+1 space + comment content
SSH Terminal:default Encoding:utf-8
Settings>tools>ssh terminal> last line default encoding: Select UTF-8
Three user inputIn Python 2:1 name = Raw_input ("Please insert your name:")2print NameIn Python 3:1 name = input ("Please insert your name:")2print nameFour use for, if...else write about guessing numbers game1Number =
python 2 # -*-coding:utf-8-*- 3 4 for in range (1, 6):5 if i > 4:6 Break #不往下走直接跳出循环 7 else:8 print(i)Output123411. Expression whileScene: Three chance to guess age1 #!/usr/bin/env python2 #-*-coding:utf-8-*-3 4My_age = 245Count =06 whileCount :7guess_age = Int (input ("Guess_age:"))8 ifGuess_age = =My_age:9 Print("Congratulations, you guessed it! ")Ten Break One elifGuess_age >My_age: A Pr
Hello, I have some python basics. He has been working on rubyonrails. But I don't like ruby because it is too flexible and I like python very much. I just don't think it is more strictly prohibited. Now I use htmlcssjs to write a small blog with django, but I don't think I have a good foundation. I 'd like to ask your comments. How can I learn
The second day of Python-core style of the Foundation, and core of python on the second day
I. syntax and statements
#: Comment
\: Press enter to continue the previous line. You can use it to split a line into multiple lines when the statement is long. It is not recommended because of its poor readability.
;: Connects two statements to one line, which has poor re
Python Environment setupStart by entering the "python" command from the terminal window to see if you have installed Python and Python's installation version locally:If not installed, you need to download the installation, the following is how Linux and Windows are installedLinux:1. Go to the Http://www.python.org/download page and download the installation packa
the programming of the program. You just need to be concerned about the problem you're trying to solve, and it's good to have the underlying question given to Python to reveal it.4. The first Python program.We are already familiar with syntax, code style, variable assignment, and memory allocation, and now we can look at some slightly more complex code.F=open ("test.log","w") f.write (" This was my first
SocketserverPython Road "Nineth": Python Foundation the Socket module is a single process and can only accept connections and requests from one client, and only when the client is disconnected can it accept connections and requests from other clients. Of course, we can also use the multi-threading module of Python to write a socket that can receive multiple clien
by one is assigned to a number of variables, with a variable received when the received6. Tips on the transfer of variable parameters and keyword parametersWe already know that variable parameters and keyword parameters will be passed the parameters of the assembly Cheng Yuanju and dictionaries, then we can also directly pass the Ganso, lists and dictionaries directly to the function as parameters, passing the time list and Ganso to the variable name to add a *, the dictionary before adding two
value is constant.Python provides partial support for functional programming. Because Python allows the use of variables, Python is not a purely functional programming language.First, the definitionSimply put, "functional programming" is a "programming paradigm" (programming paradigm), which is how to write a program's methodology.The main idea is to write the operation process as much as possible into a s
formatF.fileno () #文件在操作系统中的索引值F.flush () #实时强制刷新文件 (Save)F.isatty () #判断是不是终端文件f.name# Print File namef.newlines#F.readable () #是否为不可读文件F.seek () #寻找, move the cursor to the specified positionF.seek (#从第十个字段开始读)F.tell () #告诉你光标在文件中的位置F.truncate () #截断, truncated from the position of the cursordata = [' alex\n ', ' jack\n ']F.writelines (data) #将列表按行插入文件#eval (data) to convert a string to a dictionary4. Character encodingHigh Voltage: 1Low voltage: 0Computers only know numbersCharacter -----
/wKiom1krk3uDvc4uAAHwAzVpCmE726.png "title=" Image013.png "alt=" Wkiom1krk3udvc4uaahwazvpcme726.png "/>5. Shelve module:python A simple storage data solution650) this.width=650; "src=" Https://s2.51cto.com/wyfs02/M02/97/3E/wKioL1krk46wY84kAABeaTQnwwc529.png "title=" Image014.png "alt=" Wkiol1krk46wy84kaabeatqnwwc529.png "/>Ten, Time module: shows the elapsed times from that to present, which can be used to calculate elapsed time or display the current time650) this.width=650; "src=" Https://s3.5
quotation marks for multi-line strings, or multiline commentsJob 1Jump out of the multilayer loop, three-layer cycle, the innermost layer, jumping out of 3 layers,Job 2Shopping Cart Program (knowledge points, loops, lists,)python shopping.pyInput your salary:5000you can buy the following things:1.iphone 58002.coffee3.book4.condom>>: 1can't afford to print, how much is the difference?>>:2can afford to put into the shopping cart, deduct money, while pr
%, display percent (6 digits after the decimal point by default)
Common formatting:1TPL ="I am {}, age {}, {}". Format ("Seven", 18,'Alex')2 3TPL ="I am {}, age {}, {}". Format (*["Seven", 18,'Alex'])4 5TPL ="I am {0}, age {1}, really {0}". Format ("Seven", 18)6 7TPL ="I am {0}, age {1}, really {0}". Format (*["Seven", 18])8 9TPL ="I am {name}, age {age}, really {name}". Format (name="Seven", age=18)Ten OneTPL ="I am {name}, age {age}, really {name}". For
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