Excel export with Flask server and xlsxwriter

Question

So I\'ve been using XLSXWriter in the past to export an excel file containing one tab filled with two pandas dataframes. In the past I\'ve only been exporting the file to a loca

Answer 1

If you want xlsx file in response without storing it at the server side. You can use the following code snippet.

from flask import Flask

app = Flask(__name__)

data = [[1, 2], [3, 4]]


@app.route('/')
def get_xslx_for_data():
    try:
        response = Response()
        response.status_code = 200
        output = StringIO.StringIO()
        workbook = xlsxwriter.Workbook(output, {'in_memory': True})
        worksheet = workbook.add_worksheet('hello')
        for i, d in enumerate(data):
            for j, res in enumerate(d):
                worksheet.write(i, j, res)
        workbook.close()
        output.seek(0)
        response.data = output.read()
        file_name = 'my_file_{}.xlsx'.format(
            datetime.now().strftime('%d/%m/%Y'))
        mimetype_tuple = mimetypes.guess_type(file_name)
        response_headers = Headers({
            'Pragma': "public",  # required,
            'Expires': '0',
            'Cache-Control': 'must-revalidate, post-check=0, pre-check=0',
            'Cache-Control': 'private',  # required for certain browsers,
            'Content-Type': 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
            'Content-Disposition': 'attachment; filename=\"%s\";' % file_name,
            'Content-Transfer-Encoding': 'binary',
            'Content-Length': len(response.data)
        })

        if not mimetype_tuple[1] is None:
            response.update({
                'Content-Encoding': mimetype_tuple[1]
            })
        response.headers = response_headers
        response.set_cookie('fileDownload', 'true', path='/')
        return response
    except Exception as e:
        print(e)


if __name__ == '__main__':
    app.run()