--- a/source/gennumber.py
+++ b/source/gennumber.py
@@ -44,7 +44,7 @@
         except ValueError:
             self.num = float(str(num))
 
-    def setFromStr(self, numStr, strFormat='#\,###'):
+    def setFromStr(self, numStr, strFormat=r'#\,###'):
         """Set number value based on given format string.
 
         Removes the extra characters from format and uses format's radix char.
@@ -65,7 +65,7 @@
         return self
 
     def numStr(self, strFormat='#.##'):
-        """Return the number string in the given format, including exponents.
+        r"""Return the number string in the given format, including exponents.
 
         Format:
             # = optional digit
@@ -97,7 +97,7 @@
                                GenNumber(exp).basicNumStr(formExp))
 
     def basicNumStr(self, strFormat='#.##'):
-        """Return number string in the given format, without exponent support.
+        r"""Return number string in the given format, without exponent support.
 
         Format:
             # = optional digit
@@ -325,7 +325,7 @@
     Arguments:
         strFormat -- the string format to evaluate
     """
-    if not '\,' in strFormat and ('\.' in strFormat or (',' in strFormat
+    if not r'\,' in strFormat and (r'\.' in strFormat or (',' in strFormat
                                                     and not '.' in strFormat)):
         return ','
     return '.'
@@ -338,5 +338,5 @@
         strFormat - the string format to modify
     """
     if radix == '.':
-        return strFormat.replace('\,', ',')
-    return strFormat.replace('\.', '.')
+        return strFormat.replace(r'\,', ',')
+    return strFormat.replace(r'\.', '.')