Why would shutil.copy() raise a permission exception when cp doesn't?

The operation that is failing is chmod, not the copy itself:

  File "/usr/lib/python2.7/shutil.py", line 91, in copymode    os.chmod(dst, mode)OSError: [Errno 1] Operation not permitted: 'bin/styles/blacktie/images/ajax-loader-000000-e3e3e3.gif'

This indicates that the file already exists and is owned by another user.

shutil.copy is specified to copy permission bits. If you only want the file contents to be copied, use shutil.copyfile(src, dst), or shutil.copyfile(src, os.path.join(dst, os.path.basename(src))) if dst is a directory.

A function that works with dst either a file or a directory and does not copy permission bits:

def copy(src, dst):    if os.path.isdir(dst):        dst = os.path.join(dst, os.path.basename(src))    shutil.copyfile(src, dst)

This form worked for me:

shutil.copy('/src_path/filename','/dest_path/filename')

This is kind of a guess, but the first thing that pops out at me:

'bin/styles/blacktie/images'

You have no trailing slash. While I'm not sure of the implementation of shutil.copy(), I can tell you that cp will act differently depending on what OS you're running it on. Most likely, on your system, cp is being smart and noticing that images is a directory, and copying the file into it.

However, without the trailing slash, shutil.copy() may be interpreting it as a file, not checking, and raising the exception when it's unable to create a file named images.

In short, try this:

'bin/styles/blacktie/images/'