diff --git a/generators/python/math.js b/generators/python/math.js
index 2514d6491..a2595e00c 100644
--- a/generators/python/math.js
+++ b/generators/python/math.js
@@ -30,7 +30,7 @@ goog.require('Blockly.Python');
 
 
 // If any new block imports any library, add that library name here.
-Blockly.Python.addReservedWords('math,random');
+Blockly.Python.addReservedWords('math,random,Number');
 
 Blockly.Python['math_number'] = function(block) {
   // Numeric value.
@@ -179,12 +179,14 @@ Blockly.Python['math_number_property'] = function(block) {
   var code;
   if (dropdown_property == 'PRIME') {
     Blockly.Python.definitions_['import_math'] = 'import math';
+    Blockly.Python.definitions_['from_numbers_import_Number'] =
+        'from numbers import Number';
     var functionName = Blockly.Python.provideFunction_(
         'math_isPrime',
         ['def ' + Blockly.Python.FUNCTION_NAME_PLACEHOLDER_ + '(n):',
          '  # https://en.wikipedia.org/wiki/Primality_test#Naive_methods',
          '  # If n is not a number but a string, try parsing it.',
-         '  if type(n) not in (int, float, long):',
+         '  if not isinstance(n, Number):',
          '    try:',
          '      n = float(n)',
          '    except:',
@@ -234,12 +236,14 @@ Blockly.Python['math_number_property'] = function(block) {
 
 Blockly.Python['math_change'] = function(block) {
   // Add to a variable in place.
+  Blockly.Python.definitions_['from_numbers_import_Number'] =
+      'from numbers import Number';
   var argument0 = Blockly.Python.valueToCode(block, 'DELTA',
       Blockly.Python.ORDER_ADDITIVE) || '0';
   var varName = Blockly.Python.variableDB_.getName(block.getFieldValue('VAR'),
       Blockly.Variables.NAME_TYPE);
-  return varName + ' = (' + varName + ' if type(' + varName +
-      ') in (int, float, long) else 0) + ' + argument0 + '\n';
+  return varName + ' = (' + varName + ' if isinstance(' + varName +
+      ', Number) else 0) + ' + argument0 + '\n';
 };
 
 // Rounding functions have a single operand.
@@ -264,30 +268,33 @@ Blockly.Python['math_on_list'] = function(block) {
       code = 'max(' + list + ')';
       break;
     case 'AVERAGE':
+      Blockly.Python.definitions_['from_numbers_import_Number'] =
+          'from numbers import Number';
       var functionName = Blockly.Python.provideFunction_(
           'math_mean',
           // This operation excludes null and values that aren't int or float:',
           // math_mean([null, null, "aString", 1, 9]) == 5.0.',
           ['def ' + Blockly.Python.FUNCTION_NAME_PLACEHOLDER_ + '(myList):',
-           '  localList = [e for e in myList if type(e) in (int, float, long)]',
+           '  localList = [e for e in myList if isinstance(e, Number)]',
            '  if not localList: return',
            '  return float(sum(localList)) / len(localList)']);
       code = functionName + '(' + list + ')';
       break;
     case 'MEDIAN':
+      Blockly.Python.definitions_['from_numbers_import_Number'] =
+          'from numbers import Number';
       var functionName = Blockly.Python.provideFunction_(
           'math_median',
           // This operation excludes null values:
           // math_median([null, null, 1, 3]) == 2.0.
           ['def ' + Blockly.Python.FUNCTION_NAME_PLACEHOLDER_ + '(myList):',
-           '  localList = sorted([e for e in myList ' +
-               'if type(e) in (int, float, long)])',
+           '  localList = sorted([e for e in myList if isinstance(e, Number)])',
            '  if not localList: return',
            '  if len(localList) % 2 == 0:',
-           '    return (localList[len(localList) / 2 - 1] + ' +
-               'localList[len(localList) / 2]) / 2.0',
+           '    return (localList[len(localList) // 2 - 1] + ' +
+               'localList[len(localList) // 2]) / 2.0',
            '  else:',
-           '    return localList[(len(localList) - 1) / 2]']);
+           '    return localList[(len(localList) - 1) // 2]']);
       code = functionName + '(' + list + ')';
       break;
     case 'MODE':
diff --git a/tests/generators/procedures.xml b/tests/generators/functions.xml
similarity index 100%
rename from tests/generators/procedures.xml
rename to tests/generators/functions.xml
diff --git a/tests/generators/index.html b/tests/generators/index.html
index e7550e43a..e30de118c 100644
--- a/tests/generators/index.html
+++ b/tests/generators/index.html
@@ -274,7 +274,7 @@ h1 {
         <option value="lists.xml">Lists</option>
         <option value="colour.xml">Colour</option>
         <option value="variables.xml">Variables</option>
-        <option value="procedures.xml">Procedures</option>
+        <option value="functions.xml">Functions</option>
         <option value="">Other...</option>
       </select>
       <input type="button" value="Load" onclick="loadXml()">