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What is the os.lchflags() method in Python?

Salman Yousaf

Overview

The os.lchflags() method is used to set the flag of the path to the numeric flags. It does not follow symbolic links, unlike chflags(). We have listed some path flags that can be used according to our needs. For instance, when UF_NODUMP is set, it will delete or dump the specified file. Similarly, when UF_IMMUTABLE is set, it allows a file in read-only mode.

Path flags

Flag

Description

UF_NODUMP

Do not dump the mentioned file.

UF_IMMUTABLE

Read only, file may not be changed.

UF_APPEND

File may only be appended to.

UF_NOUNLINK

File cannot be deleted or renamed.

UF_OPAQUE

Opaque Directory, when viewed through the union stack.

SF_ARCHIVED(Super User allowed)

File may only be archived.

SF_IMMUTABLE

File may not be changed.

SF_APPEND

File may only be appended to.

SF_NOUNLINK

File may not be deleted or renamed.

SF_SNAPSHOT

File is a snapshot file.

Syntax


os.lchflags(path, flags)
Syntax of os.lchflags() method

Parameters

It takes the following argument values.

  • path: This is an object that represents a valid system path.
  • flags: Flag types are listed in the table above.

Return value

It does not return any value.

Explanation

In the following code snippet, we are going to discuss the os.lchflags() method in detail.

main.py
employee.csv
# importing OS and SYS modules
# in current program
import os,stat 
# Path
path = "employee.csv"
fd = os.open(path, os.O_CREAT | os.O_RDWR)
# Taking os.UF_NODUMP as flag value
#flag = os.UF_IMMUTABLE
# Close opened file
os.close(fd)
# invoking lchflags() function
os.lchflags(path,  stat.UF_IMMUTABLE)
print("Flag Changed Successfully!")
Try it out!
  • Line 5: We assign a file name "employee.csv" to a path variable.
  • Line 6: We invoke the open() method from the os module to open the above mentioned file in the read and write mode (os.O_RDWR). We create this if it does not exist in the module.
  • Line 12: We call the lchflags() function to change the path flags of the above-loaded file.

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