This works fine in a python interpreter on the same machine, but typing this in Blender's python console results in the following error.

I'm attempting to write an export script and just using the python console to verify everything works as expected (which so far it doesnt...)

Code:

PYTHON INTERACTIVE CONSOLE 3.2.2 (default, Sep  5 2011, 22:21:39)  [GCC 4.6.1] Command History:     Up/Down Arrow Cursor:              Left/Right Home/End Remove:              Backspace/Delete Execute:             Enter Autocomplete:        Ctrl+Space Ctrl +/-  Wheel:     Zoom Builtin Modules:     bpy, bpy.data, bpy.ops, bpy.props, bpy.types, bpy.context, bpy.utils, bgl, blf, mathutils Convenience Imports: from mathutils import *; from math import * >>> from struct import * >>> file=open("testfile","w+b") >>> file.write("BM1") Traceback (most recent call last):   File "<blender_console>", line 1, in <module> TypeError: 'str' does not support the buffer interface >>>

This is Python 3. Try writing bytes rather than a string.

fi.write( bytes( 'BM1') )