Discussion_2.ipynb

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      "authorship_tag": "ABX9TyPsEN6EYluzLH7bXz2toqNa",
      "include_colab_link": true
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    "kernelspec": {
      "name": "python3",
      "display_name": "Python 3"
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    "language_info": {
      "name": "python"
    }
  },
  "cells": [
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "view-in-github",
        "colab_type": "text"
      },
      "source": [
        "<a href=\"https://colab.research.google.com/github/scaleracademy/Language-Module-June-2022/blob/main/Discussion_2.ipynb\" target=\"_parent\"><img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/></a>"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 1,
      "metadata": {
        "colab": {
          "base_uri": "https://localhost:8080/"
        },
        "id": "76qcLSp2foID",
        "outputId": "f211abd3-3aac-4813-82d3-99dc69a2b639"
      },
      "outputs": [
        {
          "output_type": "stream",
          "name": "stdout",
          "text": [
            "something\n",
            "scaler\n"
          ]
        }
      ],
      "source": [
        "a = \"scaler\"\n",
        "b = a\n",
        "a = \"something\"\n",
        "\n",
        "print(a)\n",
        "print(b)"
      ]
    },
    {
      "cell_type": "code",
      "source": [
        "a = [1, 2, 3]\n",
        "b = a\n",
        "b[0] = 100 # mutation in the list\n",
        "\n",
        "print(a)\n",
        "print(b)"
      ],
      "metadata": {
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        },
        "id": "xeyRxLqTjRi7",
        "outputId": "55fa4547-4063-4f11-8b82-1fd33dbb9a2d"
      },
      "execution_count": 2,
      "outputs": [
        {
          "output_type": "stream",
          "name": "stdout",
          "text": [
            "[100, 2, 3]\n",
            "[100, 2, 3]\n"
          ]
        }
      ]
    },
    {
      "cell_type": "code",
      "source": [
        "a = [1, 2, 3]\n",
        "b = a\n",
        "b = [4, 5, 6]\n",
        "\n",
        "print(a)\n",
        "print(b)"
      ],
      "metadata": {
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        },
        "id": "dgpT5ho-jZVu",
        "outputId": "4bfad382-a992-4708-8984-8223f62c4a5b"
      },
      "execution_count": 3,
      "outputs": [
        {
          "output_type": "stream",
          "name": "stdout",
          "text": [
            "[1, 2, 3]\n",
            "[4, 5, 6]\n"
          ]
        }
      ]
    },
    {
      "cell_type": "code",
      "source": [
        "def foo(x):\n",
        "  print(id(x))\n",
        "  x[0] = 100\n",
        "\n",
        "\n",
        "a = [1, 2, 3]\n",
        "print(id(a))\n",
        "foo(a)\n",
        "print(a)"
      ],
      "metadata": {
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        "id": "d_-2Mgf0ji4A",
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      "outputs": [
        {
          "output_type": "stream",
          "name": "stdout",
          "text": [
            "139999154129152\n",
            "139999154129152\n",
            "[100, 2, 3]\n"
          ]
        }
      ]
    },
    {
      "cell_type": "code",
      "source": [
        "a = [1, 2, 3]\n",
        "it = iter(a)"
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      "metadata": {
        "id": "oELSHEWEksUq"
      },
      "execution_count": 7,
      "outputs": []
    },
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      "cell_type": "code",
      "source": [
        "next(it)"
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          "metadata": {},
          "execution_count": 8
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              "2"
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          "metadata": {},
          "execution_count": 9
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        "next(it)"
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              "3"
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          "metadata": {},
          "execution_count": 10
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      "cell_type": "code",
      "source": [
        "next(it)"
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          "height": 167
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        "id": "V9YA-Penlsku",
        "outputId": "056f9083-3fcd-4287-f4dc-1edfe7c27a96"
      },
      "execution_count": 11,
      "outputs": [
        {
          "output_type": "error",
          "ename": "StopIteration",
          "evalue": "ignored",
          "traceback": [
            "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
            "\u001b[0;31mStopIteration\u001b[0m                             Traceback (most recent call last)",
            "\u001b[0;32m<ipython-input-11-bc1ab118995a>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mnext\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mit\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
            "\u001b[0;31mStopIteration\u001b[0m: "
          ]
        }
      ]
    },
    {
      "cell_type": "code",
      "source": [
        "a = [1, 2, 3]\n",
        "it = iter(a)"
      ],
      "metadata": {
        "id": "qT4XYssml0uP"
      },
      "execution_count": 18,
      "outputs": []
    },
    {
      "cell_type": "code",
      "source": [
        "next(it)"
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        "outputId": "a3d315d6-58c4-4dfc-f9b0-2088038b8fd9"
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      "execution_count": 19,
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        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "1"
            ]
          },
          "metadata": {},
          "execution_count": 19
        }
      ]
    },
    {
      "cell_type": "code",
      "source": [
        "a[0] = 100\n",
        "next(it)"
      ],
      "metadata": {
        "colab": {
          "base_uri": "https://localhost:8080/"
        },
        "id": "La3YwSAEl-2v",
        "outputId": "9a60ccd2-ba8e-424a-c275-8ae1aeb8ce13"
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      "execution_count": 21,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "2"
            ]
          },
          "metadata": {},
          "execution_count": 21
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      "cell_type": "code",
      "source": [
        "next(it)"
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        "colab": {
          "base_uri": "https://localhost:8080/"
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        "id": "Jbdr640Dl_XJ",
        "outputId": "6a0b7c74-8631-42a6-f110-af090d3e54b6"
      },
      "execution_count": 16,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "3"
            ]
          },
          "metadata": {},
          "execution_count": 16
        }
      ]
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    {
      "cell_type": "code",
      "source": [
        "next(it)"
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          "base_uri": "https://localhost:8080/"
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            "text/plain": [
              "4"
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          "metadata": {},
          "execution_count": 17
        }
      ]
    },
    {
      "cell_type": "code",
      "source": [
        "for i in range(5):\n",
        "  print(i)"
      ],
      "metadata": {
        "colab": {
          "base_uri": "https://localhost:8080/"
        },
        "id": "fAVf526jmCul",
        "outputId": "5b615ec2-e180-46ec-d25b-9e32d8698bcc"
      },
      "execution_count": 22,
      "outputs": [
        {
          "output_type": "stream",
          "name": "stdout",
          "text": [
            "0\n",
            "1\n",
            "2\n",
            "3\n",
            "4\n"
          ]
        }
      ]
    },
    {
      "cell_type": "code",
      "source": [
        "a = range(5)"
      ],
      "metadata": {
        "id": "gWJvWQoWme4j"
      },
      "execution_count": 23,
      "outputs": []
    },
    {
      "cell_type": "code",
      "source": [
        "print(type(a))"
      ],
      "metadata": {
        "colab": {
          "base_uri": "https://localhost:8080/"
        },
        "id": "7kcmVKOGmirC",
        "outputId": "a46aba11-8228-4a87-aeed-812b8f1b4a72"
      },
      "execution_count": 24,
      "outputs": [
        {
          "output_type": "stream",
          "name": "stdout",
          "text": [
            "<class 'range'>\n"
          ]
        }
      ]
    },
    {
      "cell_type": "code",
      "source": [
        "iter([1, 2, 3])"
      ],
      "metadata": {
        "colab": {
          "base_uri": "https://localhost:8080/"
        },
        "id": "JYWtwnOQm5-Q",
        "outputId": "0fb6d10c-666f-488b-e2be-7b281c575f04"
      },
      "execution_count": 25,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "<list_iterator at 0x7f5417d7de80>"
            ]
          },
          "metadata": {},
          "execution_count": 25
        }
      ]
    },
    {
      "cell_type": "code",
      "source": [
        "iter(\"scaler\")"
      ],
      "metadata": {
        "colab": {
          "base_uri": "https://localhost:8080/"
        },
        "id": "b88wM3sCm8If",
        "outputId": "faa042ea-e778-4247-c602-5674f7227de8"
      },
      "execution_count": 26,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "<str_iterator at 0x7f5417cb4910>"
            ]
          },
          "metadata": {},
          "execution_count": 26
        }
      ]
    },
    {
      "cell_type": "code",
      "source": [
        "iter(range(5))"
      ],
      "metadata": {
        "colab": {
          "base_uri": "https://localhost:8080/"
        },
        "id": "Dygr7nZfnBAc",
        "outputId": "d5f1b95c-5d3e-4f9f-c8ab-bacc0a6aad76"
      },
      "execution_count": 27,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "<range_iterator at 0x7f5417cb4c60>"
            ]
          },
          "metadata": {},
          "execution_count": 27
        }
      ]
    },
    {
      "cell_type": "code",
      "source": [
        "class MyRange:\n",
        "  def __init__(self, n):\n",
        "    self.n = n\n",
        "\n",
        "  def __iter__(self):\n",
        "    return MyRangeIterator(self)\n",
        "\n",
        "class MyRangeIterator:\n",
        "  def __init__(self, range):\n",
        "    self.range = range\n",
        "    self.i = 0\n",
        "\n",
        "  def __next__(self):\n",
        "    if self.i < self.range.n:\n",
        "      res = self.i\n",
        "\n",
        "      self.i += 1\n",
        "\n",
        "      return res\n",
        "    else:\n",
        "      raise StopIteration\n"
      ],
      "metadata": {
        "id": "s8SdX1ydmjZ0"
      },
      "execution_count": 38,
      "outputs": []
    },
    {
      "cell_type": "code",
      "source": [
        "a = MyRange(5)\n",
        "for x in a:\n",
        "  print(x)\n",
        "for x in a:\n",
        "  print(x)"
      ],
      "metadata": {
        "colab": {
          "base_uri": "https://localhost:8080/"
        },
        "id": "Trf2ALRmqBGA",
        "outputId": "7671b678-9d5c-481e-91f7-013b0e4ceed1"
      },
      "execution_count": 39,
      "outputs": [
        {
          "output_type": "stream",
          "name": "stdout",
          "text": [
            "0\n",
            "1\n",
            "2\n",
            "3\n",
            "4\n",
            "0\n",
            "1\n",
            "2\n",
            "3\n",
            "4\n"
          ]
        }
      ]
    },
    {
      "cell_type": "code",
      "source": [
        "for x in MyRange(5):\n",
        "  print(x)"
      ],
      "metadata": {
        "colab": {
          "base_uri": "https://localhost:8080/"
        },
        "id": "JeFvzVSkncCH",
        "outputId": "8396ee55-2147-49fa-ee46-afe93aea5797"
      },
      "execution_count": 35,
      "outputs": [
        {
          "output_type": "stream",
          "name": "stdout",
          "text": [
            "0\n",
            "1\n",
            "2\n",
            "3\n",
            "4\n"
          ]
        }
      ]
    },
    {
      "cell_type": "code",
      "source": [
        "class MyRange:\n",
        "  def __init__(self, n):\n",
        "    self.n = n\n",
        "    self.i = 0\n",
        "\n",
        "  def __iter__(self):\n",
        "    return self\n",
        "\n",
        "  def __next__(self):\n",
        "    if self.i < self.n:\n",
        "      res = self.i\n",
        "      self.i += 1\n",
        "      return res\n",
        "    else:\n",
        "      raise StopIteration  "
      ],
      "metadata": {
        "id": "zBzkeeZhndVq"
      },
      "execution_count": 41,
      "outputs": []
    },
    {
      "cell_type": "code",
      "source": [
        "a = MyRange(5)\n",
        "for x in a:\n",
        "  print(x)\n",
        "for x in a:\n",
        "  print(x)"
      ],
      "metadata": {
        "colab": {
          "base_uri": "https://localhost:8080/"
        },
        "id": "XEAj2SB6qMFk",
        "outputId": "b11a83fd-c232-46a5-f433-416537fce32f"
      },
      "execution_count": 42,
      "outputs": [
        {
          "output_type": "stream",
          "name": "stdout",
          "text": [
            "0\n",
            "1\n",
            "2\n",
            "3\n",
            "4\n"
          ]
        }
      ]
    },
    {
      "cell_type": "code",
      "source": [
        "for x in MyRange(5):\n",
        "  print(x)"
      ],
      "metadata": {
        "colab": {
          "base_uri": "https://localhost:8080/"
        },
        "id": "xx7ZyTvPp6_R",
        "outputId": "5bce13f6-bf89-425f-d733-cfa2d4f8416f"
      },
      "execution_count": 37,
      "outputs": [
        {
          "output_type": "stream",
          "name": "stdout",
          "text": [
            "0\n",
            "1\n",
            "2\n",
            "3\n",
            "4\n"
          ]
        }
      ]
    },
    {
      "cell_type": "code",
      "source": [
        "contacts = [1, 2, 3]\n",
        "users = getUsersUsingPhoneNumber(contacts)"
      ],
      "metadata": {
        "id": "HOmMGpbjp9SP"
      },
      "execution_count": null,
      "outputs": []
    }
  ]
}