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Python os.fdopen() Method with example

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

The Python's os fdopen() method returns an open file object that is connected to the file descriptor fd. Then you can now perform all the defined functions on file object.


Below is the syntax for Python Os fdopen() method -

os.fdopen(fd,  [ ,  mode[,  bufsize] ] );

Parameter Details

  • fd - It is the file descriptor for which a file object is to be returned.
  • mode - This is an optional argument, and it is a string indicating how the file is to be opened. The most often used values of mode are 'r' for reading, 'w' for writing and 'a' for appending.
  • bufsize - This is an optional argument, and it is used for specifying the file's desired buffer size; 0 simply means unbuffered, then 1 means line buffered, and any other positive value means use a buffer of that size.

Return Value

This method returns an open file object which is connected to the file descriptor.


The following below is a simple example -


import os, sys

# Open a file
fd = os.open( "foo.txt", os.O_RDWR|os.O_CREAT )

# Now get a file object for the above file.
fo = os.fdopen(fd, "w+")

# Tell the current position
print "Current I/O pointer position :%d" % fo.tell()

# Write one string
fo.write( "Python is a great language.\nYeah its great!!\n");

# Now read this file from the beginning.
os.lseek(fd, 0, 0)
str = os.read(fd, 100)
print "Read String is : ", str

# Tell the current position
print "Current I/O pointer position :%d" % fo.tell()

# Close opened file

print "Closed the file successfully!!"

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

Current I/O pointer position :0
Read String is :  This is testPython is a great language.
Yeah its great!!

Current I/O pointer position :45
Closed the file successfully!!

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

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