Hi Samo,
I don't think you need temporary files at all;
have you tried something like this?
from cStringIO import StringIO
image_file = StringIO()
img = Draw.MolToImage(row[molCol], size=size)
img.save(image_file, format='PNG')
image_data = image_file.getvalue()
Grégori
On 03. 11. 14 21:44, Samo Turk wrote:
Hi Grégori,
Thanks for pointing this out. I modified the code and now it writes
only one temporary file.
Cheers,
Samo
On Fri, Oct 31, 2014 at 10:56 AM, Grégori Gerebtzoff
<greg...@gerebtzoff.com <mailto:greg...@gerebtzoff.com>> wrote:
Hi Samo,
I used a few years ago the PHPExcel library to put images into an
Excel file, and it was not necessary to use physical files.
Having a quick look at the library I found this class (probably
the one I used): PHPExcel_Worksheet_MemoryDrawing (source code:
https://github.com/clariondoor/PHPExcel/blob/master/Worksheet/MemoryDrawing.php)
The interesting bit:
public function __construct()
{
// Initialise values
$this->_imageResource = null;
$this->_renderingFunction = self::RENDERING_DEFAULT;
$this->_mimeType = self::MIMETYPE_DEFAULT;
$this->_uniqueName = md5(rand(0, 9999). time()
. rand(0, 9999));
// Initialize parent
parent::__construct();
}
Thus I'm pretty sure you can use the same trick in python
XlsxWriter (have a look at the _add_image_files function in
packager.py), using a random file name and a bit stream to the
image, as described here:
http://xlsxwriter.readthedocs.org/en/latest/example_images_bytesio.html#ex-images-bytesio:
filename = 'python.png'
image_file = open(filename, 'rb')
image_data = BytesIO(image_file.read())
image_file.close()
# Write the byte stream image to a cell. The filename must be
specified.
worksheet.insert_image('B8', filename, {'image_data': image_data})
At least it's worth a try!
Another trick I had to do both with PHPExcel and in VBA was to set
the width of columns three times to make sure that it was actually
correct. Don't ask me why... Just in case you face some width issues.
Good luck!
Grégori
On 30. 10. 14 16:49, Samo Turk wrote:
Hi rdkiters,
Due to popular demand I started to work on a function to export
pandas DataFrame to xlsx with molecule images embedded.
Because of the xlsx specifics the code is not optimal. The most
annoying thing about this implementation is that it has to write
all images to the hard drive, before it packs them in xlsx (and
deletes them at the end). I checked two python xlsx libraries and
both save images that way. If someone finds better solution,
please share it.
The dimensions of cells with images are not optimal because Excel
is weird. :) From xlsxwriter docs): "The width corresponds to the
column width value that is specified in Excel. It is
approximately equal to the length of a string in the default font
of Calibri 11. Unfortunately, there is no way to specify
“AutoFit” for a column in the Excel file format."
It crashes if value of a cell is of wrong type so use
df['value'].astype() to fix incorrectly assigned types.
Resulting files work nicely in Office 365 (standalone and web
app), but for some reason don't work optimally with LibreOffice
(after row ~125 it stacks all images).
I made a pull request on GitHub:
https://github.com/rdkit/rdkit/pull/371
Demo:
http://nbviewer.ipython.org/github/Team-SKI/snippets/blob/master/IPython/rdkit_hackaton/XLSX%20export.ipynb
Demo xlsx file:
https://github.com/Team-SKI/snippets/blob/master/IPython/rdkit_hackaton/demo.xlsx
Regards,
Samo
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