Detailed explanation of commonly used methods for file directories in os and os.path modules

Python is a cross-platform language, which means that the same source code can be implemented equally on different operating systems without modification.

With OS module, we don’t need to worry about which module is used under which operating system. The OS module will help you choose the correct module and call it.

1Return to the current working directory2Change the working directory 3List the file names in the specified directory ('. ' represents the current directory, '..' represents the upper-level directory) 4mkdir(path)Create a single-level directory, such as The directory already exists5makedirs(path)6remove(path)7rmdir(path) Delete a single-level directory. If the directory is not empty, an exception will be thrown.8removedirs(path)Recursion Delete the directory and try to delete it layer by layer from the subdirectory to the parent directory. If the directory is not empty, an exception will be thrown 9rename(old, Rename the file old to new10system(command)Command to run the system 11walk(Traverse all subdirectories below the top path and return a triple: (path, [include directory], [include file])

	##FunctionName	Usage method
	getcwd ()
	chdir(path)
	listdir(path='.')
		Throws exception
		RecursiveCreate Multi-level directories, if the directory already exists, an exception will be thrown. Note: 'E:\\a\\b' and 'E:\\a\\c' will not conflict
		Delete file
	new )
	top)

The following are some definitions commonly used in supporting path operations, supporting all platforms

123Linux45

os.path moduleCommonly used functions on paths

	##Function name	Usage
os.curdir	Refers to the current directory ('.')
os.pardir	Refers to the upper-level directory ('..')
os.sep	Output operating system-specific path separator ('\\' under Win,	is '/')
os.linesep	The line terminator used by the current platform (it is '\r under Win \n', '\n' under Linux)
os.name	refers to the currently used operating system

## 6 getsize(file) Return Specify the size of the file in bytes 7 getatime(file) Returns the latest access time of the specified file (8 getctime(file ) Returns the creation time of the specified file (floating point seconds, which can be converted using the gmtime() or localtime() function of the time module) ##9

Number	Function name	Usage method
1	basename(path)	Remove the directory path and return the file name alone
2	dirname(path)	Remove the file name and return the directory path alone
3	join(path1[, path2[, ...]])	Combine the parts of path1 and path2 into a path name
4	split(path)	Split the file name and path and return the (f_path, f_name) tuple. If the directory is used entirely, it will also split the last directory as a file name and will not determine whether the file or directory exists
5	splitext(path)	Separate the file name and extension and return the (f_name, f_extension) tuple
		float Point type seconds, you can use the gmtime() or localtime() function of the time module to convert)
getmtime(file)	Returns the latest modification time of the specified file (floating point seconds, which can be converted by the gmtime() or localtime() function of the time module)

The following functions return True or False

##Function nameUsage method1exists(path)Determine whether the specified path (directory or file) exists2isabs(path)Judge whether the specified path is an absolute path3isdir(path)Judge the specified path Whether it exists and is a directory4isfile(path)Determine whether the specified path exists and is a file5islink(path) Determine whether the specified path exists and is a symbolic link6ismount(path)Determine whether the specified path exists and is a mount point7samefile(path1, paht2)Determine whether path1 and path2 point to the same file

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