def copy(src, dst):
    """
    Copy a file or a folder (recursively) from src to dst.

    For simplicity sake, both src and dst must be absolute path and must
    include the filename of the file or folder.
    Also do not include any trailing slash.

    e.g. copy('/path/to/src_file', '/path/to/dst_file')
    or copy('/path/to/src_folder', '/path/to/dst_folder')

    But not: copy('/path/to/src_file', 'path/to/')
    or copy('/path/to/src_folder/', '/path/to/dst_folder')

    Args:
        src (str): Source file or folder
        dst (str): Destination file or folder
    """
    assert isinstance(src, str)
    assert os.path.exists(src)
    assert isinstance(dst, str)

    # Create the path to the dst file if it does not exists
    abs_path = os.path.dirname(os.path.abspath(dst))
    if not os.path.isdir(abs_path):
        os.makedirs(abs_path)

    # We need to copy a single file
    if os.path.isfile(src):
        # Copy the src file to dst
        shutil.copy(src, dst)

    # We need to copy a whole folder
    elif os.path.isdir(src):
        shutil.copytree(src, dst)

    # What the heck is this ?
    else:
        raise ValueError("Unsupported file: {}".format(src))

    # Set the good mode to the file or folder recursively
    chmod(dst)