diff --git a/kraft/tools/erml2pdf.py b/kraft/tools/erml2pdf.py

index b20a748..b9ac413 100644

--- a/kraft/tools/erml2pdf.py

+++ b/kraft/tools/erml2pdf.py

@@ -22,7 +22,7 @@

 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 import sys

-import StringIO

+import io

 import xml.dom.minidom

 import copy

 import subprocess

@@ -102,7 +102,7 @@ regex_h = re.compile('#([0-9a-zA-Z][0-9a-zA-Z])([0-9a-zA-Z][0-9a-zA-Z])([0-9a-zA

 def color_get(col_str):

         global allcols

-        if col_str in allcols.keys():

+        if col_str in list(allcols.keys()):

                 return allcols[col_str]

         res = regex_t.search(col_str, 0)

         if res:

@@ -331,7 +331,7 @@ class _rml_canvas(object):

 				flow.drawOn(self.canvas,infos['x'],infos['y'])

 				infos['height']-=h

 			else:

-				raise ValueError, "Not enough space"

+				raise ValueError("Not enough space")

 	def _line_mode(self, node):

 		ljoin = {'round':1, 'mitered':0, 'bevelled':2}

@@ -351,10 +351,10 @@ class _rml_canvas(object):

 			self.canvas.setDash(node.getAttribute('dash').split(','))

 	def _image(self, node):

-		import urllib

+		import urllib.request, urllib.parse, urllib.error

 		from reportlab.lib.utils import ImageReader

-		u = urllib.urlopen(str(node.getAttribute('file')))

-		s = StringIO.StringIO()

+		u = urllib.request.urlopen(str(node.getAttribute('file')))

+		s = io.StringIO()

 		s.write(u.read())

 		s.seek(0)

 		img = ImageReader(s)

@@ -582,7 +582,7 @@ class _rml_template(object):

 		if not node.hasAttribute('pageSize'):

 			pageSize = (unit_get('21cm'), unit_get('29.7cm'))

 		else:

-			ps = map(lambda x:x.strip(), node.getAttribute('pageSize').replace(')', '').replace('(', '').split(','))

+			ps = [x.strip() for x in node.getAttribute('pageSize').replace(')', '').replace('(', '').split(',')]

 			pageSize = ( unit_get(ps[0]),unit_get(ps[1]) )

 		cm = reportlab.lib.units.cm

 		self.doc_tmpl = platypus.BaseDocTemplate(out, pagesize=pageSize, **attr_get(node, ['leftMargin','rightMargin','topMargin','bottomMargin'], {'allowSplitting':'int','showBoundary':'bool','title':'str','author':'str'}))

@@ -651,7 +651,7 @@ class PdfWatermark:

      	    outputStream.close()

      	    return self.outputFile

      	else: 

-     	    stringIO = StringIO.StringIO();

+     	    stringIO = io.StringIO();

      	    outputPdf.write( stringIO )

      	    return stringIO.getvalue()

@@ -664,34 +664,34 @@ def parseString(data, fout=None):

 		fp.close()

 		return fout

 	else:

-		fp = StringIO.StringIO()

+		fp = io.StringIO()

 		r.render(fp)

 		return fp.getvalue()

 def erml2pdf_help():

-	print 'Usage: erml2pdf [options] input.rml > output.pdf'

-	print ''

-	print 'Tool to render a file of the xml based markup language RML to PDF'

-	print 'with option to merge another PDF file as watermark.'

-	print ''

-	print 'Options:'

-	print '-o, --output <file>           output file, instead of standard out'

-	print '-m, --watermark-mode <mode>   set the watermark mode with '

-	print '                              0 = no watermark (default)'

-	print '                              1 = watermark on first page'

-	print '                              2 = watermark on all pages'

-	print '                              Note: a watermark file must be specified for 1, 2'

-	print '-w, --watermark-file <file>   watermark file, the first page is used.'

-	print ''

+	print('Usage: erml2pdf [options] input.rml > output.pdf')

+	print('')

+	print('Tool to render a file of the xml based markup language RML to PDF')

+	print('with option to merge another PDF file as watermark.')

+	print('')

+	print('Options:')

+	print('-o, --output <file>           output file, instead of standard out')

+	print('-m, --watermark-mode <mode>   set the watermark mode with ')

+	print('                              0 = no watermark (default)')

+	print('                              1 = watermark on first page')

+	print('                              2 = watermark on all pages')

+	print('                              Note: a watermark file must be specified for 1, 2')

+	print('-w, --watermark-file <file>   watermark file, the first page is used.')

+	print('')

 	sys.exit(0)

 if __name__=="__main__":

     try:

         opts, args = getopt.getopt(sys.argv[1:], "ho:w:m:", ["help", "output=", "watermark-file=", "watermark-mode="])

-    except getopt.GetoptError, err:

+    except getopt.GetoptError as err:

         # print help information and exit:

-        print str(err) # will print something like "option -a not recognized"

+        print(str(err)) # will print something like "option -a not recognized"

         erml2pdf_help()

         sys.exit(2)

     output = None

@@ -724,7 +724,7 @@ if __name__=="__main__":

 	# print "############ Watermark-Mode: " + watermarkMode

 	if watermarkMode != Mark.NOTHING:

 	    wm = PdfWatermark()

-	    pdfStringFile = StringIO.StringIO()

+	    pdfStringFile = io.StringIO()

 	    pdfStringFile.write( pdf )

 	    pdf = wm.watermark( pdfStringFile, watermarkFile, watermarkMode )

@@ -734,4 +734,4 @@ if __name__=="__main__":

 	    outfile.write( pdf )

 	    outfile.close()

 	else:

-            print pdf

+            print(pdf)

-- 

2.25.1