Discover python os module tutorial, include the articles, news, trends, analysis and practical advice about python os module tutorial on alibabacloud.com
Python Crawler Tutorial -09-error moduleToday's protagonist is the error, crawl, it is easy to appear wrong, so we have to do in the code, common mistakes in the place, about Urllib.errorUrlerror Reasons for Urlerror production: 1. No network connection 2. Server Connection failure 3. The specified server could not be found 4.URLError is a subclass of OSError Case
First, the module classification:1. Standard library module: Python comes with, directly using the import can be used directly;2. Third-party library: External use, need to download first (pip install module_name)3. Program Customization Module: The module of its own definit
Python-based asyncore module usage example tutorial, pythonasyncore This article analyzes the principles and usage of the asyncore module in Python by examples and shares it with you for your reference. The specific analysis is as follows: The asyncore library is a standard
Tutorial on how to operate byte streams/binary streams in the struct module of Python, pythonstruct Preface Recently, I used Python to parse the MNIST dataset in the IDX file format and needed to read the binary file. I used the struct module. I checked many tutorials on the
OS module, pythonos Module OS. getcwd () obtains the current working directory, that is, the operating directory path of the current python script. chdir ("dirname") changes the current script working directory, which is equivalent to cdos in shell. curdir returns the curren
This article mainly introduces the use of Base64 module in Python to process character encoding tutorial, sample code based on the python2.x version, the need for friends can refer to the Base64 is a method that uses 64 characters to represent arbitrary binary data. Open exe with Notepad, JPG, pdf These files, we will see a lot of garbled, because the binary fi
SYS modulesys.argv command line argument list, the first element is the programmer's ability path Sys.exit (n) exit the program, exit normally exits (0) Sys.version Gets the version information of the Python interpreter sys.maxint the largest int value ( /c0>3. 0 Cancel) Sys.path returns the search path for the module, initializes with the value of the PYTHONPATH environment variable Sys.platform returns th
JSONdic={' name ': ' Egon ', ' Age ': 18}With open (' Db1.json ', ' wt ', encoding= ' utf-8 ') as F:Json.dump (DIC,F)With open (' Db1.json ', ' RT ', encoding= ' utf-8 ') as F:Dic=json.load (f)Print (dic[' name '])Serialization of =-==============================pickle#pickle可识别各种数据, but only for python, with poor cross-platform, to bytes data into a hard driveImport PickleSerialization ofs={1,2,3,4,}Res=pickle.dumps (s)Print (Res,type (res))With ope
: OS. linesep Windows uses '\ r \ n', Linux uses' \ n', and Mac uses '\ R' to indicate the platform you are using: OS. name is 'nt 'for Windows, while for Linux/Unix users, it is 'posix' renamed: OS. rename (old, new) creates a multilevel Directory: OS. makedirs (r "c: \ python
0x020403F0 sys. version # obtain the version information of the Python interpreter sys. maxint # The maximum Int value sys. maxunicode # maximum Unicode value sys. modules # Return the module field imported by the system. The key is the module name and the value is the module sys. path # Return the module's search pat
type, size, and modification time ). Import OS. pathPath = '/home/vamei/doc/file.txt' Print (OS. path. exists (path) # query whether a file exists Print (OS. path. getsize (path) # query the file sizePrint (OS. path. getatime (path) # query the last file read timePrint (OS.
Day6 OS module, day6os OS Module Provides an interface for calling the operating system. (1) OS. getcwd () obtains the current working directory, that is, the directory path of the current python script. >>>
. rmdir (' dir ')#OS. Removedirs (' Dirs\\dir ') Delete a folder #Print (OS. Listdir (OS.GETCWD ())) # listing Information # [' 1.py ', ' re-supplemental. Py ', ' module. Py '] ##======= os.stat (path) # Get file information ==========##Print (Os.stat (R ' E:\PycharmProjects\python course \s7 day20 ')) # Get file info
first absolute path are ignored. path. getatime (path) returns the last access time of the file or directory pointed to by path 30 OS. path. getmtime (path) returns the last modification time of the file or directory pointed to by path 31 OS. path. getsize (path) returns the size of the path ''' 5. sys Sys. argv command line parameter List. The first element is the program path sys. exit (n) exit the progr
JavaScript standard Reference Tutorial (Alpha) Draft II: node. js OS Module GitHub TOP OS ModuleFrom the JavaScript standard reference tutorial (Alpha), by Ruan FengDirectory Api
JSON and OS modulesphase One, data exchange1, the basic introduction of JSONThe JSON full name is the JavaScript object Notation (that is, the JavaScript objects tag), which is a subset of JavaScript.Front-end and back-end data interaction, in fact, JS and Python for data interaction2. JSON module APIInterface One: Json.dumps (obj) # converts the Obj object into
Python Module 2: python Module 10 common modules:1> OS module:OS. getcwd (): Get the current working directory, that is, the directory path of the current python script;OS. chdir ("dirn
\, then a null value is returned. The second element of Os.path.split (path), os.path.exists (path), returns True if path exists, or if path does not exist, returns Falseos.path.isabs if path is an absolute path, Returns Trueos.path.isfile (path) If path is an existing file and returns True. Otherwise, return Falseos.path.isdir (path) True if path is a directory that exists. Otherwise return Falseos.path.join (path1[, path2[, ...]) When multiple paths are combined, the parameters before the fir
Python is a cross-platform language, which means that the same source code can be implemented in different operating systems without the need for modification. With the OS module, we don't have to worry about what the operating system is using, and the OS module will help y
ModuleImportRandomprint (Random.random ()) # 0-1 decimal print ( Random.uniform (3,10)) 3-10 decimal print (Random.randint (1,10)) 1- 10 integer print (Random.randrange (1,10,2)) 1-10 odd print (Random.choice ([1, ' Jay ", [ Span data-mce-= "" " Galen " hu Spicy Soup print (Random.sample ([1, 23 ", [4, 5], 2)" Any 2 combinations of list elements Random.shuffle (LST) # Random Shuffle order OS and OS
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
