diff --git a/BlockPi/src/msg/js/en.js b/BlockPi/src/msg/js/en.js
index d87cd06..59fd789 100644
--- a/BlockPi/src/msg/js/en.js
+++ b/BlockPi/src/msg/js/en.js
@@ -592,8 +592,10 @@ Blockly.Msg["DICTIONARIES_SET_KEY_TOOLTIP"] = "Sets the value of a key in a dict
 Blockly.Msg["DICTIONARIES_GET_KEY_DICT"] = "in dictionary"
 Blockly.Msg["DICTIONARIES_GET_KEY"] = " get value by key"
 Blockly.Msg["DICTIONARIES_POP_KEY"] = "get and remove value by key"
+Blockly.Msg["DICTIONARIES_DEL_KEY"] = "remove value by key"
 Blockly.Msg["DICTIONARIES_GET_KEY_TOOLTIP"] = "Returns the value of a key in a dictionary."
 Blockly.Msg["DICTIONARIES_POP_KEY_TOOLTIP"] = "Removes and returns the value of a key in a dictionary."
+Blockly.Msg["DICTIONARIES_DEL_KEY_TOOLTIP"] = "Removes the item by the given key in a dictionary."
 Blockly.Msg["DICTIONARIES_KEYS_DICT"] = "in dictionary"
 Blockly.Msg["DICTIONARIES_KEYS_KEY"] = "get key list"
 Blockly.Msg["DICTIONARIES_KEYS_VALUE"] = "get value list"
diff --git a/BlockPi/src/msg/js/zh-hans.js b/BlockPi/src/msg/js/zh-hans.js
index 381e15b..f3a30b3 100644
--- a/BlockPi/src/msg/js/zh-hans.js
+++ b/BlockPi/src/msg/js/zh-hans.js
@@ -592,8 +592,10 @@ Blockly.Msg["DICTIONARIES_SET_KEY_TOOLTIP"] = "设置在字典中指定键的值
 Blockly.Msg["DICTIONARIES_GET_KEY_DICT"] = "在字典中"
 Blockly.Msg["DICTIONARIES_GET_KEY"] = "取得 值从键"
 Blockly.Msg["DICTIONARIES_POP_KEY"] = "取得并移除 值从键"
-Blockly.Msg["DICTIONARIES_GET_KEY_TOOLTIP"] = "返回在字典中指定键的值。"
-Blockly.Msg["DICTIONARIES_POP_KEY_TOOLTIP"] = "移除并返回在字典中指定键的值。"
+Blockly.Msg["DICTIONARIES_DEL_KEY"] = "移除 值从键"
+Blockly.Msg["DICTIONARIES_GET_KEY_TOOLTIP"] = "从字典中返回指定键的值。"
+Blockly.Msg["DICTIONARIES_POP_KEY_TOOLTIP"] = "从字典中移除并返回指定键的值。"
+Blockly.Msg["DICTIONARIES_DEL_KEY_TOOLTIP"] = "从字典中移除指定键。"
 Blockly.Msg["DICTIONARIES_KEYS_DICT"] = "在字典中"
 Blockly.Msg["DICTIONARIES_KEYS_KEY"] = "取得 键 列表"
 Blockly.Msg["DICTIONARIES_KEYS_VALUE"] = "取得 值 列表"
diff --git a/BlockPi/src/msg/js/zh-hant.js b/BlockPi/src/msg/js/zh-hant.js
index c005c64..c26b371 100644
--- a/BlockPi/src/msg/js/zh-hant.js
+++ b/BlockPi/src/msg/js/zh-hant.js
@@ -592,8 +592,10 @@ Blockly.Msg["DICTIONARIES_SET_KEY_TOOLTIP"] = "設置在字典中指定鍵的值
 Blockly.Msg["DICTIONARIES_GET_KEY_DICT"] = "自字典"
 Blockly.Msg["DICTIONARIES_GET_KEY"] = "取得 值從鍵"
 Blockly.Msg["DICTIONARIES_POP_KEY"] = "取得併移除 值從鍵"
-Blockly.Msg["DICTIONARIES_GET_KEY_TOOLTIP"] = "返回在字典中指定鍵的值。"
-Blockly.Msg["DICTIONARIES_POP_KEY_TOOLTIP"] = "移除並返回在字典中指定鍵的值。"
+Blockly.Msg["DICTIONARIES_DEL_KEY"] = "移除 值從鍵"
+Blockly.Msg["DICTIONARIES_GET_KEY_TOOLTIP"] = "自字典中返回指定鍵的值。"
+Blockly.Msg["DICTIONARIES_POP_KEY_TOOLTIP"] = "自字典中移除並返回指定鍵的值。"
+Blockly.Msg["DICTIONARIES_DEL_KEY_TOOLTIP"] = "自字典中移除的指定鍵。"
 Blockly.Msg["DICTIONARIES_KEYS_DICT"] = "自字典"
 Blockly.Msg["DICTIONARIES_KEYS_KEY"] = "取得 鍵 清單"
 Blockly.Msg["DICTIONARIES_KEYS_VALUE"] = "取得 值 清單"
diff --git a/BlockPi/src/script/blocks_compressed.js b/BlockPi/src/script/blocks_compressed.js
index 9247725..3e5fed8 100644
--- a/BlockPi/src/script/blocks_compressed.js
+++ b/BlockPi/src/script/blocks_compressed.js
@@ -16,8 +16,9 @@ b).connection.targetConnection;c&&-1==a.indexOf(c)&&c.disconnect()}this.itemCoun
 this.itemCount_||this.getInput("EMPTY")||(this.appendDummyInput("EMPTY").appendField(Blockly.Msg.DICTIONARIES_CREATE_EMPTY_TITLE),this.setTooltip(Blockly.Msg.DICTIONARIES_CREATE_EMPTY_TOOLTIP));for(var a=0;a<this.itemCount_;a++)if(!this.getInput("VALUE"+a)){var b=this.appendValueInput("VALUE"+a);0==a&&b.appendField(Blockly.Msg.DICTIONARIES_CREATE_WITH_INPUT_WITH);b.setAlign(Blockly.ALIGN_RIGHT).appendField(Blockly.Msg.DICTIONARIES_CREATE_WITH_INPUT_KEY).appendField(new Blockly.FieldTextInput(""),
 "KEY"+a).appendField(Blockly.Msg.DICTIONARIES_CREATE_WITH_INPUT_VALUE)}for(;this.getInput("VALUE"+a);)this.removeInput("VALUE"+a),a++}};Blockly.Blocks.dictionaries_create_with_container={init:function(){this.setColour(Blockly.Msg.DICTIONARIES_HUE);this.appendDummyInput().appendField(Blockly.Msg.DICTIONARIES_CREATE_WITH_CONTAINER_TITLE_VALUE);this.appendStatementInput("STACK");this.setTooltip(Blockly.Msg.DICTIONARIES_CREATE_WITH_CONTAINER_TOOLTIP);this.contextMenu=!1}};
 Blockly.Blocks.dictionaries_create_with_item={init:function(){this.setColour(Blockly.Msg.DICTIONARIES_HUE);this.appendDummyInput().appendField(Blockly.Msg.DICTIONARIES_CREATE_WITH_ITEM_TITLE);this.setPreviousStatement(!0);this.setNextStatement(!0);this.setTooltip(Blockly.Msg.DICTIONARIES_CREATE_WITH_ITEM_TOOLTIP);this.contextMenu=!1}};
-Blockly.Blocks.dictionaries_get_key={init:function(){var a=this,b=new Blockly.FieldDropdown([[Blockly.Msg.DICTIONARIES_GET_KEY,"GET"],[Blockly.Msg.DICTIONARIES_POP_KEY,"POP"]]);this.appendValueInput("DICT").setCheck("Dictionary").appendField(Blockly.Msg.DICTIONARIES_GET_KEY_DICT);this.appendValueInput("KEY").setCheck("String").appendField(b,"MODE");this.setInputsInline(!0);this.setOutput(!0,null);this.setColour(Blockly.Msg.DICTIONARIES_HUE);this.setTooltip(function(){var b=a.getFieldValue("MODE");
-if("GET"==b)return Blockly.Msg.DICTIONARIES_GET_KEY_TOOLTIP;if("POP"==b)return Blockly.Msg.DICTIONARIES_POP_KEY_TOOLTIP;throw Error("Unknown mode: "+b);});this.setHelpUrl("")}};
+Blockly.Blocks.dictionaries_get_key={init:function(){var a=new Blockly.FieldDropdown([[Blockly.Msg.DICTIONARIES_GET_KEY,"GET"],[Blockly.Msg.DICTIONARIES_POP_KEY,"POP"],[Blockly.Msg.DICTIONARIES_DEL_KEY,"DEL"]],function(a){a="DEL"==a;this.getSourceBlock().updateStatement_(a)});this.appendValueInput("DICT").setCheck("Dictionary").appendField(Blockly.Msg.DICTIONARIES_GET_KEY_DICT);this.appendValueInput("KEY").setCheck("String").appendField(a,"MODE");this.setInputsInline(!0);this.setOutput(!0);this.setColour(Blockly.Msg.DICTIONARIES_HUE);
+var b=this;this.setTooltip(function(){var a=b.getFieldValue("MODE");if("GET"==a)return Blockly.Msg.DICTIONARIES_GET_KEY_TOOLTIP;if("POP"==a)return Blockly.Msg.DICTIONARIES_POP_KEY_TOOLTIP;if("DEL"==a)return Blockly.Msg.DICTIONARIES_DEL_KEY_TOOLTIP;throw Error("Unknown mode: "+a);});this.setHelpUrl("")},mutationToDom:function(){var a=Blockly.utils.xml.createElement("mutation");a.setAttribute("statement",!this.outputConnection);return a},domToMutation:function(a){a="true"==a.getAttribute("statement");
+this.updateStatement_(a)},updateStatement_:function(a){a!=!this.outputConnection&&(this.unplug(!0,!0),a?(this.setOutput(!1),this.setPreviousStatement(!0),this.setNextStatement(!0)):(this.setPreviousStatement(!1),this.setNextStatement(!1),this.setOutput(!0)))}};
 Blockly.Blocks.dictionaries_keys={init:function(){var a=this,b=new Blockly.FieldDropdown([[Blockly.Msg.DICTIONARIES_KEYS_KEY,"KEY"],[Blockly.Msg.DICTIONARIES_KEYS_VALUE,"VALUE"]]);this.appendValueInput("DICT").setCheck("Dictionary").appendField(Blockly.Msg.DICTIONARIES_KEYS_DICT);this.appendDummyInput().appendField(b,"MODE");this.setInputsInline(!0);this.setOutput(!0,"Array");this.setColour(Blockly.Msg.DICTIONARIES_HUE);this.setTooltip(function(){var b=a.getFieldValue("MODE");if("KEY"==b)return Blockly.Msg.DICTIONARIES_KEYS_TOOLTIP;
 if("VALUE"==b)return Blockly.Msg.DICTIONARIES_VALUES_TOOLTIP;throw Error("Unknown mode: "+b);});this.setHelpUrl("")}};Blockly.Blocks.gpioin={};Blockly.Constants.GPIOin={};Blockly.Constants.GPIOin.HUE=180;
 Blockly.defineBlocksWithJsonArray([{type:"gpio_devices_in",message0:"%{BKY_GPIO_DEVICES_IN_TITLE}",args0:[{type:"field_variable",name:"VAR",variable:"%{BKY_VARIABLES_DEFAULT_NAME}",variableTypes:["DeviceIN"],defaultType:"DeviceIN"}],output:"DeviceIN",colour:"%{BKY_GPIOIN_HUE}",tooltip:"%{BKY_GPIO_DEVICES_IN_TOOLTIP}",helpUrl:""},{type:"gpio_input_digital",message0:"%{BKY_GPIO_INPUT_DIGITAL_TITLE}",args0:[{type:"input_value",name:"PIN",check:"Number"},{type:"input_value",name:"device",check:"DeviceIN"}],
diff --git a/BlockPi/src/script/python_compressed.js b/BlockPi/src/script/python_compressed.js
index 6535475..ff92ca8 100644
--- a/BlockPi/src/script/python_compressed.js
+++ b/BlockPi/src/script/python_compressed.js
@@ -2,7 +2,7 @@
 'use strict';
 
 
-Blockly.Python=new Blockly.Generator("Python");Blockly.Python.addReservedWords("False,None,True,and,as,assert,break,class,continue,def,del,elif,else,except,exec,finally,for,from,global,if,import,in,is,lambda,nonlocal,not,or,pass,print,raise,return,try,while,with,yield,NotImplemented,Ellipsis,__debug__,quit,exit,copyright,license,credits,ArithmeticError,AssertionError,AttributeError,BaseException,BlockingIOError,BrokenPipeError,BufferError,BytesWarning,ChildProcessError,ConnectionAbortedError,ConnectionError,ConnectionRefusedError,ConnectionResetError,DeprecationWarning,EOFError,Ellipsis,EnvironmentError,Exception,FileExistsError,FileNotFoundError,FloatingPointError,FutureWarning,GeneratorExit,IOError,ImportError,ImportWarning,IndentationError,IndexError,InterruptedError,IsADirectoryError,KeyError,KeyboardInterrupt,LookupError,MemoryError,ModuleNotFoundError,NameError,NotADirectoryError,NotImplemented,NotImplementedError,OSError,OverflowError,PendingDeprecationWarning,PermissionError,ProcessLookupError,RecursionError,ReferenceError,ResourceWarning,RuntimeError,RuntimeWarning,StandardError,StopAsyncIteration,StopIteration,SyntaxError,SyntaxWarning,SystemError,SystemExit,TabError,TimeoutError,TypeError,UnboundLocalError,UnicodeDecodeError,UnicodeEncodeError,UnicodeError,UnicodeTranslateError,UnicodeWarning,UserWarning,ValueError,Warning,ZeroDivisionError,_,__build_class__,__debug__,__doc__,__import__,__loader__,__name__,__package__,__spec__,abs,all,any,apply,ascii,basestring,bin,bool,buffer,bytearray,bytes,callable,chr,classmethod,cmp,coerce,compile,complex,copyright,credits,delattr,dict,dir,divmod,enumerate,eval,exec,execfile,exit,file,filter,float,format,frozenset,getattr,globals,hasattr,hash,help,hex,id,input,int,intern,isinstance,issubclass,iter,len,license,list,locals,long,map,max,memoryview,min,next,object,oct,open,ord,pow,print,property,quit,range,raw_input,reduce,reload,repr,reversed,round,set,setattr,slice,sorted,staticmethod,str,sum,super,tuple,type,unichr,unicode,vars,xrange,zip");
+Blockly.Python=new Blockly.Generator("Python");Blockly.Python.addReservedWords("False,None,True,and,as,assert,break,class,continue,def,del,elif,else,except,exec,finally,for,from,global,if,import,in,is,lambda,nonlocal,not,or,pass,print,raise,return,try,while,with,yield,NotImplemented,Ellipsis,__debug__,quit,exit,copyright,license,credits,ArithmeticError,AssertionError,AttributeError,BaseException,BlockingIOError,BrokenPipeError,BufferError,BytesWarning,ChildProcessError,ConnectionAbortedError,ConnectionError,ConnectionRefusedError,ConnectionResetError,DeprecationWarning,EOFError,Ellipsis,EnvironmentError,Exception,FileExistsError,FileNotFoundError,FloatingPointError,FutureWarning,GeneratorExit,IOError,ImportError,ImportWarning,IndentationError,IndexError,InterruptedError,IsADirectoryError,KeyError,KeyboardInterrupt,LookupError,MemoryError,ModuleNotFoundError,NameError,NotADirectoryError,NotImplemented,NotImplementedError,OSError,OverflowError,PendingDeprecationWarning,PermissionError,ProcessLookupError,RecursionError,ReferenceError,ResourceWarning,RuntimeError,RuntimeWarning,StandardError,StopAsyncIteration,StopIteration,SyntaxError,SyntaxWarning,SystemError,SystemExit,TabError,TimeoutError,TypeError,UnboundLocalError,UnicodeDecodeError,UnicodeEncodeError,UnicodeError,UnicodeTranslateError,UnicodeWarning,UserWarning,ValueError,Warning,ZeroDivisionError,_,__build_class__,__debug__,__doc__,__import__,__loader__,__name__,__package__,__spec__,abs,all,any,apply,ascii,basestring,bin,bool,buffer,bytearray,bytes,callable,chr,classmethod,cmp,coerce,compile,complex,copyright,credits,delattr,dict,dir,divmod,enumerate,eval,exec,execfile,exit,file,filter,float,format,frozenset,getattr,globals,hasattr,hash,help,hex,id,input,int,intern,isinstance,issubclass,iter,len,license,list,locals,long,map,max,memoryview,min,next,object,oct,open,ord,pow,print,property,quit,range,raw_input,reduce,reload,repr,reversed,round,set,setattr,slice,sorted,staticmethod,str,sum,super,tuple,type,unichr,unicode,vars,xrange,ziptime,gpiozero,tm1637,sense_hat,sense_emu,SenseHat,sense,event");
 Blockly.Python.ORDER_ATOMIC=0;Blockly.Python.ORDER_COLLECTION=1;Blockly.Python.ORDER_STRING_CONVERSION=1;Blockly.Python.ORDER_MEMBER=2.1;Blockly.Python.ORDER_FUNCTION_CALL=2.2;Blockly.Python.ORDER_EXPONENTIATION=3;Blockly.Python.ORDER_UNARY_SIGN=4;Blockly.Python.ORDER_BITWISE_NOT=4;Blockly.Python.ORDER_MULTIPLICATIVE=5;Blockly.Python.ORDER_ADDITIVE=6;Blockly.Python.ORDER_BITWISE_SHIFT=7;Blockly.Python.ORDER_BITWISE_AND=8;Blockly.Python.ORDER_BITWISE_XOR=9;Blockly.Python.ORDER_BITWISE_OR=10;
 Blockly.Python.ORDER_RELATIONAL=11;Blockly.Python.ORDER_LOGICAL_NOT=12;Blockly.Python.ORDER_LOGICAL_AND=13;Blockly.Python.ORDER_LOGICAL_OR=14;Blockly.Python.ORDER_CONDITIONAL=15;Blockly.Python.ORDER_LAMBDA=16;Blockly.Python.ORDER_NONE=99;
 Blockly.Python.ORDER_OVERRIDES=[[Blockly.Python.ORDER_FUNCTION_CALL,Blockly.Python.ORDER_MEMBER],[Blockly.Python.ORDER_FUNCTION_CALL,Blockly.Python.ORDER_FUNCTION_CALL],[Blockly.Python.ORDER_MEMBER,Blockly.Python.ORDER_MEMBER],[Blockly.Python.ORDER_MEMBER,Blockly.Python.ORDER_FUNCTION_CALL],[Blockly.Python.ORDER_LOGICAL_NOT,Blockly.Python.ORDER_LOGICAL_NOT],[Blockly.Python.ORDER_LOGICAL_AND,Blockly.Python.ORDER_LOGICAL_AND],[Blockly.Python.ORDER_LOGICAL_OR,Blockly.Python.ORDER_LOGICAL_OR]];
@@ -21,7 +21,7 @@ Blockly.Python.dictionaries_length=function(a){return["len("+Blockly.Python.valu
 Blockly.Python.dictionaries_isEmpty=function(a){return["not len("+Blockly.Python.valueToCode(a,"DICT",Blockly.Python.ORDER_NONE||"{}")+")",Blockly.Python.ORDER_LOGICAL_NOT]};Blockly.Python.dictionaries_key_in=function(a){var b=Blockly.Python.valueToCode(a,"KEY",Blockly.Python.ORDER_NONE||"''"),c=a.getFieldValue("MODE");a=Blockly.Python.valueToCode(a,"DICT",Blockly.Python.ORDER_NONE||"{}");return[b+" "+c+" "+a,Blockly.Python.ORDER_RELATIONAL]};
 Blockly.Python.dictionaries_update=function(a){var b=Blockly.Python.valueToCode(a,"DICT1",Blockly.Python.ORDER_NONE||"{}");a=Blockly.Python.valueToCode(a,"DICT2",Blockly.Python.ORDER_NONE||"{}");return b+".update("+a+")\n"};
 Blockly.Python.dictionaries_set_key=function(a){var b=Blockly.Python.valueToCode(a,"DICT",Blockly.Python.ORDER_NONE||"{}"),c=Blockly.Python.valueToCode(a,"KEY",Blockly.Python.ORDER_NONE||"''");a=Blockly.Python.valueToCode(a,"VALUE",Blockly.Python.ORDER_NONE||"None");return b+"["+c+"] = "+a+"\n"};
-Blockly.Python.dictionaries_get_key=function(a){var b=Blockly.Python.valueToCode(a,"DICT",Blockly.Python.ORDER_NONE||"{}"),c=a.getFieldValue("MODE");a=Blockly.Python.valueToCode(a,"KEY",Blockly.Python.ORDER_NONE||"''");if("GET"==c)return[b+"["+a+"]",Blockly.Python.ORDER_MEMBER];if("POP"==c)return[b+".pop("+a+")",Blockly.Python.ORDER_FUNCTION_CALL]};
+Blockly.Python.dictionaries_get_key=function(a){var b=Blockly.Python.valueToCode(a,"DICT",Blockly.Python.ORDER_NONE||"{}"),c=a.getFieldValue("MODE");a=Blockly.Python.valueToCode(a,"KEY",Blockly.Python.ORDER_NONE||"''");if("GET"==c)return[b+"["+a+"]",Blockly.Python.ORDER_MEMBER];if("POP"==c)return[b+".pop("+a+")",Blockly.Python.ORDER_FUNCTION_CALL];if("DEL"==c)return"del "+b+"["+a+"]\n"};
 Blockly.Python.dictionaries_keys=function(a){var b=Blockly.Python.valueToCode(a,"DICT",Blockly.Python.ORDER_NONE||"{}");a=a.getFieldValue("MODE");if("KEY"==a)return["list("+b+".keys())",Blockly.Python.ORDER_FUNCTION_CALL];if("VALUE"==a)return["list("+b+".values())",Blockly.Python.ORDER_FUNCTION_CALL]};Blockly.Python.gpioin={};Blockly.Python.gpio_devices_in=function(a){return[Blockly.Python.variableDB_.getName(a.getFieldValue("VAR"),Blockly.Variables.NAME_TYPE),Blockly.Python.ORDER_ATOMIC]};Blockly.Python.gpio_input_digital=function(a){Blockly.Python.definitions_["from_gpiozero_import_*"]="from gpiozero import *";var b=Blockly.Python.valueToCode(a,"PIN",Blockly.Python.ORDER_NONE);return Blockly.Python.valueToCode(a,"device",Blockly.Python.ORDER_NONE)+" = DigitalInputDevice("+b+")\n"};
 Blockly.Python.gpio_input_smoothed=function(a){Blockly.Python.definitions_["from_gpiozero_import_*"]="from gpiozero import *";var b=Blockly.Python.valueToCode(a,"PIN",Blockly.Python.ORDER_NONE);return Blockly.Python.valueToCode(a,"device",Blockly.Python.ORDER_NONE)+" = SmoothedInputDevice("+b+")\n"};
 Blockly.Python.gpio_button=function(a){Blockly.Python.definitions_["from_gpiozero_import_*"]="from gpiozero import *";var b=Blockly.Python.valueToCode(a,"PIN",Blockly.Python.ORDER_NONE);return Blockly.Python.valueToCode(a,"button",Blockly.Python.ORDER_NONE)+" = Button("+b+")\n"};
diff --git a/blocks/dictionaries.js b/blocks/dictionaries.js
index 8ae5522..c865d52 100644
--- a/blocks/dictionaries.js
+++ b/blocks/dictionaries.js
@@ -306,31 +306,82 @@ Blockly.Blocks['dictionaries_create_with_item'] = {
 
 Blockly.Blocks['dictionaries_get_key'] = {
   init: function() {
-    var thisBlock = this;
-    var dropdown = new Blockly.FieldDropdown(
+    var MODE =
         [
           [Blockly.Msg['DICTIONARIES_GET_KEY'], "GET"],
-          [Blockly.Msg['DICTIONARIES_POP_KEY'], "POP"]
-        ]);
+          [Blockly.Msg['DICTIONARIES_POP_KEY'], "POP"],
+          [Blockly.Msg['DICTIONARIES_DEL_KEY'], "DEL"]
+      ];
+    var modeMenu = new Blockly.FieldDropdown(MODE, function(value) {
+      var isStatement = (value == 'DEL');
+      this.getSourceBlock().updateStatement_(isStatement);
+    });
     this.appendValueInput("DICT")
         .setCheck("Dictionary")
         .appendField(Blockly.Msg['DICTIONARIES_GET_KEY_DICT']);
     this.appendValueInput("KEY")
         .setCheck("String")
-        .appendField(dropdown, "MODE");
+        .appendField(modeMenu, "MODE");
     this.setInputsInline(true);
-    this.setOutput(true, null);
+    this.setOutput(true);
     this.setColour(Blockly.Msg['DICTIONARIES_HUE']);
+    var thisBlock = this;
     this.setTooltip(function() {
       var mode = thisBlock.getFieldValue('MODE');
       if (mode == 'GET') {
         return Blockly.Msg['DICTIONARIES_GET_KEY_TOOLTIP'];
       } else if (mode == 'POP') {
         return Blockly.Msg['DICTIONARIES_POP_KEY_TOOLTIP'];
+      } else if (mode == 'DEL') {
+        return Blockly.Msg['DICTIONARIES_DEL_KEY_TOOLTIP']
       }
       throw Error('Unknown mode: ' + mode);
     });
     this.setHelpUrl("");
+  },
+  /**
+   * Create XML to represent whether the block is a statement or a value.
+   * @return {Element} XML storage element.
+   * @this {Blockly.Block}
+   */
+  mutationToDom: function() {
+     var container = Blockly.utils.xml.createElement('mutation');
+     var isStatement = !this.outputConnection;
+     container.setAttribute('statement', isStatement);
+     return container;
+  },
+  /**
+   * Parse XML to restore the 'AT' input.
+   * @param {!Element} xmlElement XML storage element.
+   * @this {Blockly.Block}
+   */
+  domToMutation: function(xmlElement) {
+    // Note: Until January 2013 this block did not have mutations,
+    // so 'statement' defaults to false.
+    var isStatement = (xmlElement.getAttribute('statement') == 'true');
+    this.updateStatement_(isStatement);
+  },
+  /**
+   * Switch between a value block and a statement block.
+   * @param {boolean} newStatement True if the block should be a statement.
+   *     False if the block should be a value.
+   * @private
+   * @this {Blockly.Block}
+   */
+  updateStatement_: function (newStatement) {
+    var oldStatement = !this.outputConnection;
+    if (newStatement != oldStatement) {
+      this.unplug(true, true);
+      if (newStatement) {
+        this.setOutput(false);
+        this.setPreviousStatement(true);
+        this.setNextStatement(true);
+      } else {
+        this.setPreviousStatement(false);
+        this.setNextStatement(false);
+        this.setOutput(true);
+      }
+    }
   }
 };
 
diff --git a/generators/python.js b/generators/python.js
index 8291014..de3be6a 100644
--- a/generators/python.js
+++ b/generators/python.js
@@ -79,7 +79,8 @@ Blockly.Python.addReservedWords(
     'issubclass,iter,len,license,list,locals,long,map,max,memoryview,min,' +
     'next,object,oct,open,ord,pow,print,property,quit,range,raw_input,reduce,' +
     'reload,repr,reversed,round,set,setattr,slice,sorted,staticmethod,str,' +
-    'sum,super,tuple,type,unichr,unicode,vars,xrange,zip'
+    'sum,super,tuple,type,unichr,unicode,vars,xrange,zip' + 
+    'time,gpiozero,tm1637,sense_hat,sense_emu,SenseHat,sense,event'
 );
 
 /**
diff --git a/generators/python/dictionaries.js b/generators/python/dictionaries.js
index 4620f24..c11f799 100644
--- a/generators/python/dictionaries.js
+++ b/generators/python/dictionaries.js
@@ -66,7 +66,9 @@ Blockly.Python['dictionaries_get_key'] = function(block) {
     return [dict + '[' + key + ']', Blockly.Python.ORDER_MEMBER];
   } else if (mode == 'POP') {
     return [dict + '.pop(' + key + ')', Blockly.Python.ORDER_FUNCTION_CALL];
-  }  
+  } else if (mode == 'DEL') {
+    return 'del ' + dict + '[' + key + ']\n';
+  }
 };
 
 Blockly.Python['dictionaries_keys'] = function(block) {