diff --git a/interfaces/cython/cantera/mixmaster/Edit.py b/interfaces/cython/cantera/mixmaster/Edit.py
index bc9f92a52..2cc8fa3b7 100644
--- a/interfaces/cython/cantera/mixmaster/Edit.py
+++ b/interfaces/cython/cantera/mixmaster/Edit.py
@@ -119,23 +119,23 @@ class EditFrame(Frame):
             Label(thframe,text='Parametrization:').grid(row=1,column=1)
             self.addEntry(thframe,'',2,0,'NasaPolynomial')
             Label(thframe,text='Temperatures (min, mid, max):').grid(row=3,column=1)
-            self.addEntry(thframe,'',4,0,`sp.minTemp`)
-            self.addEntry(thframe,'',5,0,`sp.midTemp`)
-            self.addEntry(thframe,'',6,0,`sp.maxTemp`)
+            self.addEntry(thframe,'',4,0,str(sp.minTemp))
+            self.addEntry(thframe,'',5,0,str(sp.midTemp))
+            self.addEntry(thframe,'',6,0,str(sp.maxTemp))
         low = Frame(thframe)
         low.config(relief=GROOVE,bd=4)
         low.grid(row=1,rowspan=6,column=3,columnspan=2)
         Label(low,text='Coefficients for the Low\n Temperature Range').grid(row=0,column=0,columnspan=2,sticky=E+W)
         c = sp.thermoParam().coefficients(sp.minTemp)
         for j in range(7):
-            self.addEntry(low,'a'+`j`,j+3,0,`c[j]`)
+            self.addEntry(low,'a'+str(j),j+3,0,str(c[j]))
         high = Frame(thframe)
         high.config(relief=GROOVE,bd=4)
         high.grid(row=1,rowspan=6,column=5,columnspan=2)
         Label(high,text='Coefficients for the High\n Temperature Range').grid(row=0,column=0,columnspan=2,sticky=E+W)
         c = sp.thermoParam().coefficients(sp.maxTemp)
         for j in range(7):
-            self.addEntry(high,'a'+`j`,j+3,0,`c[j]`)
+            self.addEntry(high,'a'+str(j),j+3,0,str(c[j]))
 
         com = Frame(e)
         com.grid(row=10,column=0,columnspan=5)