Python os.fchmod() Method with example

2 min readAug 5, 2020

Hello readers! Welcome back to another section of my tutorial on Python. In this tutorial guide, we are going to be studying about the Os fchmod() method.

The Python os fchmod() method changes the mode of the file given by fd to the numeric mode.

Note — This method is available on Python version 2.6 onwards.

Syntax

The following below is the syntax for Python Os fchmod() method -

os.fchmod(fd, mode);

Parameter Details

fd — The file descriptor for which the mode would be set.
mode — It may take one of the below mentioned values or bitwise ORed combinations of them.
stat.S_ISUID — It sets the user ID on execution.
stat.S_ISGID — It sets the group ID on execution.
stat.S_ENFMT — The record locking is enforced.
stat.S_ISVTX — Save text image after execution.
stat.S_IREAD — Read by owner.
stat.S_IWRITE — Write by owner.
stat.S_IEXEC — Execute by owner.
stat.S_IRWXU — Read, write, and as well execute by owner.
stat.S_IRUSR — Read by owner.
stat.S_IWUSR — Write by owner.
stat.S_IXUSR — Execute by owner.
stat.S_IRWXG — Read, write, and also execute by group.
stat.S_IRGRP — Read by group.
stat.S_IWGRP — Write by group.
stat.S_IXGRP — Execute by group.
stat.S_IRWXO — Read, write, and also execute by others.
stat.S_IROTH — Read by others.
stat.S_IWOTH — Write by others.
stat.S_IXOTH — Execute by others.
stat.S_IWUSR - Write by owner.

Return Value

It does not return any value.

Example

The following below is a simple example -

#!/usr/bin/python

import os, sys, stat

# Now open a file "/tmp/foo.txt"
fd = os.open( "/tmp", os.O_RDONLY )

# Set a file execute by the group.

os.fchmod( fd, stat.S_IXGRP)

# Set a file write by others.
os.fchmod(fd, stat.S_IWOTH)

print "Changed mode successfully!!"

# Close opened file.
os.close( fd )

Output

When the above code is executed, it will produce the following result -

Changed mode successfully!!

Alright guys! This is where we are rounding up for this tutorial post. In my next tutorial, we are going to be studying about Python the OS fchown() Method.

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