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Python os.close() Method
The Python os.close() method closes the specified file descriptor. File descriptors in Python are identifiers that represents the open files in the os kernel and are kept in a table of files.
Typically, file descriptors have non-negative values. Negative results denote an error or a "no value" condition. The main things they assist with are accessing files and other input/output devices like network sockets or pipes.
Syntax
Following is the syntax of Python os.close() method −
os.close(fd);
Parameters
fd − This is the file descriptor of the file.
Return Value
This method does not return any value.
Example
The following example shows the usage of Python os.close() method. Here we are creating a file descriptor 'os.O_RDWR|os.O_CREAT'. Then we write a string "This is test" in the file. Thereafter, we are closing the file using this method.
import os, sys import os, sys # Open a file fd = os.open("foo.txt", os.O_RDWR|os.O_CREAT) # Write one string string = "This is test" x = str.encode(string) os.write(fd,x) # Close opened file os.close(fd) print ("Closed the file successfully!!")
When we run above program, it produces following result −
Closed the file successfully!!
Example
In the example given below we are creating a file descriptor 'r'. This means reading the file.
import os file = "code.txt" file_Object = open(file, "r") fd = file_Object.fileno() print("The descriptor of the file for %s is %s" % (file, fd)) os.close(fd)
While executing the above code we get the following output −
The descriptor of the file for code.txt is 3
Example
If the file descriptor is not valid, then this method raises the EBADF error.
import os # Creating a file descriptor filedesc = os.open("code.txt", os.O_RDWR) # closing an invalid file descriptor os.close(filedesc + 1)
Following is an output of the above code −
Traceback (most recent call last): File "/home/sarika/Desktop/chown.py", line 5, in <module> os.close(filedesc + 1) OSError: [Errno 9] Bad file descriptor