012_4_Python_Remove_Set_Items.ipynb

{"nbformat":4,"nbformat_minor":2,"metadata":{"orig_nbformat":4,"language_info":{"name":"python","version":"3.8.2","mimetype":"text/x-python","codemirror_mode":{"name":"ipython","version":3},"pygments_lexer":"ipython3","nbconvert_exporter":"python","file_extension":".py"},"kernelspec":{"name":"python3","display_name":"Python 3.8.2 32-bit"},"interpreter":{"hash":"8a42e8581704d812f174276cadf47b91a8b3cbce976324507688b69a62b18c0b"},"colab":{"name":"012_4_Python_Remove_Set_Items.ipynb","provenance":[]}},"cells":[{"cell_type":"markdown","source":["# การลบข้อมูลใน Set"],"metadata":{"id":"fEr9_ehSQOwi"}},{"cell_type":"markdown","source":["การลบข้อมูลใน set สามารถใช้คำสั่ง remove() หรือ discard()"],"metadata":{"id":"hCS45haQQOwo"}},{"cell_type":"markdown","source":["## ตัวอย่าง\r\n","ลบ \"Burger\" โดยใช้คำสั่ง remove() \r\n","\r\n","Note : ถ้าหากข้อมูลที่ต้องการลบไม่มีอยู่ใน set คำสั่ง remove() จะเกิด error "],"metadata":{"id":"kw6U1ePSQOwp"}},{"cell_type":"code","execution_count":1,"source":["foodset = {\"Sushi\", \"Burger\", \"Salad\"}\r\n","foodset.remove(\"Burger\")\r\n","print(foodset)"],"outputs":[{"output_type":"stream","name":"stdout","text":["{'Salad', 'Sushi'}\n"]}],"metadata":{"id":"Ei7K-MAfQOwp","outputId":"68eeae40-8001-4113-a333-e2bc8d8ed19f"}},{"cell_type":"markdown","source":["## ตัวอย่าง\r\n","ลบ \"Burger\" โดยใช้คำสั่ง discard()\r\n","\r\n","Note : ถ้าหากข้อมูลที่ต้องการลบไม่มีใน set คำสั่ง discard() จะไม่เกิด error"],"metadata":{"id":"fcD_d21PQOwr"}},{"cell_type":"code","execution_count":2,"source":["foodset = {\"Sushi\", \"Burger\", \"Salad\"}\r\n","foodset.discard(\"Burger\")\r\n","print(foodset)"],"outputs":[{"output_type":"stream","name":"stdout","text":["{'Salad', 'Sushi'}\n"]}],"metadata":{"id":"QVp9yUsoQOws","outputId":"ca5ce323-8041-4220-8660-aebc40999a58"}},{"cell_type":"markdown","source":["## ตัวอย่าง\r\n","ลบข้อมูลล่าสุดโดยใช้คำสั่ง pop()\r\n","\r\n","Note : set เป็นข้อมูลที่ไม่มีลำดับ ดังนั้น เมื่อเราใช้คำสั่ง pop() เราจะไม่รู้ว่าข้อมูลใดถูกลบ\r\n"],"metadata":{"id":"r2_ECO5wQOwt"}},{"cell_type":"code","execution_count":3,"source":["foodset = {\"Sushi\", \"Burger\", \"Salad\"}\r\n","x = foodset.pop()\r\n","print(x)\r\n","print(foodset)"],"outputs":[{"output_type":"stream","name":"stdout","text":["Salad\n","{'Sushi', 'Burger'}\n"]}],"metadata":{"id":"LIbrEBv4QOwu","outputId":"03572ddb-1a03-4561-c772-b9718286cbe0"}},{"cell_type":"markdown","source":["## ตัวอย่าง\r\n","ใช้คำสั่ง clear() เพื่อลบข้อมูลทั้งหมดใน set"],"metadata":{"id":"fRDFODAtQOwv"}},{"cell_type":"code","execution_count":4,"source":["foodset = {\"Sushi\", \"Burger\", \"Salad\"}\r\n","foodset.clear()\r\n","print(foodset)"],"outputs":[{"output_type":"stream","name":"stdout","text":["set()\n"]}],"metadata":{"id":"Cqmj3KpQQOwv","outputId":"ec5cd6d3-d319-4931-bdec-15de327bb112"}},{"cell_type":"markdown","source":["## ตัวอย่าง\r\n","ใช้คำสั่ง del เพื่อลบ set"],"metadata":{"id":"ipK49AfzQOww"}},{"cell_type":"code","execution_count":6,"source":["foodset = {\"Sushi\", \"Burger\", \"Salad\"}\r\n","del foodset\r\n","print(foodset) #จะขึ้น error เพราะไม่มี set ที่ชื่อว่า foodset อยู่แล้ว"],"outputs":[{"output_type":"error","ename":"NameError","evalue":"name 'foodset' is not defined","traceback":["\u001b[1;31m---------------------------------------------------------------------------\u001b[0m","\u001b[1;31mNameError\u001b[0m                                 Traceback (most recent call last)","\u001b[1;32m~\\AppData\\Local\\Temp/ipykernel_11036/276858955.py\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m      1\u001b[0m \u001b[0mfoodset\u001b[0m \u001b[1;33m=\u001b[0m \u001b[1;33m{\u001b[0m\u001b[1;34m\"Sushi\"\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;34m\"Burger\"\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;34m\"Salad\"\u001b[0m\u001b[1;33m}\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      2\u001b[0m \u001b[1;32mdel\u001b[0m \u001b[0mfoodset\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 3\u001b[1;33m \u001b[0mprint\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mfoodset\u001b[0m\u001b[1;33m)\u001b[0m \u001b[1;31m#จะขึ้น error เพราะไม่มี set ที่ชื่อว่า foodset อยู่แล้ว\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m","\u001b[1;31mNameError\u001b[0m: name 'foodset' is not defined"]}],"metadata":{"id":"V-d3XCLIQOww","outputId":"e04dd56b-533c-42f2-a021-9854565a7844"}}]}