sorting-dates.ipynb

sorting-dates.ipynb

{
  "cells": [
    {
      "cell_type": "code",
      "source": [
        "import datetime"
      ],
      "outputs": [],
      "execution_count": 1,
      "metadata": {
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        }
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    },
    {
      "cell_type": "code",
      "source": [
        "today = datetime.date.today()\n",
        "today"
      ],
      "outputs": [
        {
          "output_type": "execute_result",
          "execution_count": 2,
          "data": {
            "text/plain": "datetime.date(2020, 10, 28)"
          },
          "metadata": {}
        }
      ],
      "execution_count": 2,
      "metadata": {
        "execution": {
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        }
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    },
    {
      "cell_type": "code",
      "source": [
        "now = datetime.datetime.now()\n",
        "now"
      ],
      "outputs": [
        {
          "output_type": "execute_result",
          "execution_count": 3,
          "data": {
            "text/plain": "datetime.datetime(2020, 10, 28, 9, 55, 31, 64038)"
          },
          "metadata": {}
        }
      ],
      "execution_count": 3,
      "metadata": {
        "execution": {
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          "shell.execute_reply": "2020-10-28T08:55:31.130Z"
        }
      }
    },
    {
      "cell_type": "code",
      "source": [
        "sorted([now, today])"
      ],
      "outputs": [
        {
          "output_type": "error",
          "ename": "TypeError",
          "evalue": "can't compare datetime.datetime to datetime.date",
          "traceback": [
            "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
            "\u001b[0;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
            "\u001b[0;32m<ipython-input-4-97aef87903c9>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0msorted\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0mnow\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mtoday\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
            "\u001b[0;31mTypeError\u001b[0m: can't compare datetime.datetime to datetime.date"
          ]
        }
      ],
      "execution_count": 4,
      "metadata": {
        "execution": {
          "iopub.status.busy": "2020-10-28T08:55:34.696Z",
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        }
      }
    },
    {
      "cell_type": "code",
      "source": [
        "def dates_before_datetimes(dt):\n",
        "    if isinstance(dt, datetime.datetime):\n",
        "        return (dt.date(), dt)  # return a length-2 tuple with date as the first item, datetime as the second        \n",
        "    elif isinstance(dt, datetime.date):\n",
        "        return (dt,)  # return a length-1 tuple with date object\n",
        "        "
      ],
      "outputs": [],
      "execution_count": 5,
      "metadata": {
        "execution": {
          "shell.execute_reply": "2020-10-28T08:55:35.792Z",
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        }
      }
    },
    {
      "cell_type": "code",
      "source": [
        "dates_before_datetimes(today)"
      ],
      "outputs": [
        {
          "output_type": "execute_result",
          "execution_count": 7,
          "data": {
            "text/plain": "(datetime.date(2020, 10, 28),)"
          },
          "metadata": {}
        }
      ],
      "execution_count": 7,
      "metadata": {
        "collapsed": true,
        "jupyter": {
          "source_hidden": false,
          "outputs_hidden": false
        },
        "nteract": {
          "transient": {
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          }
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        "execution": {
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        }
      }
    },
    {
      "cell_type": "code",
      "source": [
        "dates_before_datetimes(now)"
      ],
      "outputs": [
        {
          "output_type": "execute_result",
          "execution_count": 8,
          "data": {
            "text/plain": "(datetime.date(2020, 10, 28),\n datetime.datetime(2020, 10, 28, 9, 55, 31, 64038))"
          },
          "metadata": {}
        }
      ],
      "execution_count": 8,
      "metadata": {
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        "execution": {
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          "shell.execute_reply": "2020-10-28T08:56:06.320Z"
        }
      }
    },
    {
      "cell_type": "code",
      "source": [
        "sorted([now, today], key=dates_before_datetimes)"
      ],
      "outputs": [
        {
          "output_type": "execute_result",
          "execution_count": 6,
          "data": {
            "text/plain": "[datetime.date(2020, 10, 28),\n datetime.datetime(2020, 10, 28, 9, 55, 31, 64038)]"
          },
          "metadata": {}
        }
      ],
      "execution_count": 6,
      "metadata": {
        "execution": {
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