Python os.write(filehandler, data) : TypeError An Integer Required

Question

I get Attribute Error: 'int' object has no attribute 'write'.

Here is a part of my script

data = urllib.urlopen(swfurl)

        save = raw_input("Type filename for saving. 'D' for same filename")

        if save.lower() == "d":
        # here gives me Attribute Error

            fh = os.open(swfname,os.O_WRONLY|os.O_CREAT|os.O_TRUNC)
            fh.write(data)

        # #####################################################

Here is error:

Traceback (most recent call last):
  File "download.py", line 41, in <module>
    fh.write(data)
AttributeError: 'int' object has no attribute 'write'

oleg · Accepted Answer · 2013-06-02 19:52:13Z

3

os.open returns file descriptor. Use os.write to write into open file

import os
# Open a file
fd = os.open( "foo.txt", os.O_WRONLY | os.O_CREAT | os.O_TRUNC)
# Write one string
os.write(fd, "This is test")
# Close opened file
os.close( fd )

Or better use python files if You don't need any low level API

with open('foo.txt', 'w') as output_file:
    output_file.write('this is test')

edited Jun 2, 2013 at 19:52

answered Jun 2, 2013 at 19:46

oleg

4,21218 silver badges17 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Blender · Accepted Answer · 2013-06-02 19:48:04Z

1

os.open() returns a file descriptor (an integer), not a file object. From the docs:

Note: This function is intended for low-level I/O. For normal usage, use the built-in function open(), which returns a “file object” with read() and write() methods (and many more). To wrap a file descriptor in a “file object”, use fdopen().

You should use the builtin open() function instead:

fh = open(swfname, 'w')
fh.write(data)
fh.close()

Or a context manager:

with open(swfname, 'w') as handle:
    handle.write(data)

answered Jun 2, 2013 at 19:48

Blender

300k55 gold badges462 silver badges511 bronze badges

1 Comment

Ryan B. Lynch Over a year ago

In this situation, the builtin open() is not appropriate because it lacks the low-level API necessary to pass the flags O_WRONLY, O_CREAT, & O_TRUNC. The poster is correct to use os.open(). In case you're not familiar with this mechanism, see @oleg's answer, which outlines both the builtin open() and os.open(), and gives some guidance as to when to use os.open().

Collectives™ on Stack Overflow

Python os.write(filehandler, data) : TypeError An Integer Required

2 Answers 2

Comments

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related