{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 4,
   "id": "c7b3e794-2bb7-41a6-9b90-28a8ad61b644",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "0\n",
      "1\n",
      "2\n",
      "3\n",
      "4\n",
      "5\n",
      "6\n",
      "7\n",
      "8\n",
      "9\n"
     ]
    }
   ],
   "source": [
    "for i in range(10):\n",
    "    print(i)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "c748202a-4a95-4b1b-8ba1-7ebb106c2e99",
   "metadata": {},
   "source": [
    "## 2.1 嵌套"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "e02f6691-4293-4d8a-895b-6618fc51f9ae",
   "metadata": {},
   "source": [
    "- fo嵌套\n",
    "- for if嵌套"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "id": "eaf26468-451a-43d4-b947-1064f8d1ae47",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "          \u001b[31m*\u001b[0m          \n",
      "         \u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m         \n",
      "        \u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m        \n",
      "       \u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m       \n",
      "      \u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m      \n",
      "     \u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m     \n",
      "    \u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m    \n",
      "   \u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m   \n",
      "  \u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m  \n",
      " \u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m \n",
      "\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\n",
      " \u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m \n",
      "  \u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m  \n",
      "   \u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m   \n",
      "    \u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m    \n",
      "     \u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m     \n",
      "      \u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m      \n",
      "       \u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m       \n",
      "        \u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m        \n",
      "         \u001b[31m*\u001b[0m\u001b[31m*\u001b[0m\u001b[31m*\u001b[0m         \n",
      "          \u001b[31m*\u001b[0m          \n"
     ]
    }
   ],
   "source": [
    "r = 10 \n",
    "for y in range(2 * r + 1):\n",
    "    for x in range(2 * r + 1):\n",
    "        if y >= -x + r and y >= x -r and y <= x + r and y <= -x + 3 * r:\n",
    "            print(\"\\033[31m*\\033[0m\", end=\"\")\n",
    "        else:\n",
    "            print(\" \", end=\"\")\n",
    "    print()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 28,
   "id": "31f66a43-f3c0-40eb-afc7-97ea41d6be9e",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "True"
      ]
     },
     "execution_count": 28,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "import cv2\n",
    "import numpy\n",
    "\n",
    "wh = 500\n",
    "\n",
    "# 生成空的图像 【矩阵】【二维数组】\n",
    "\n",
    "g = [[[0, 0, 255] for y in range(2*wh)] for x in range(2*wh)]  # BGR RGB\n",
    "g = numpy.array(g)\n",
    "\n",
    "for y in range(2*wh):\n",
    "    for x in range(2*wh):\n",
    "        if y >= -x + wh and y >= x -wh and y <= x + wh and y <= -x + 3 * wh:\n",
    "            g[y, x, :] = [0, 255, 0]\n",
    "        else:\n",
    "            g[y, x, :] = [0, 0, 0]\n",
    "cv2.imwrite(\"tu.png\", g)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 30,
   "id": "de60f33d-a19f-4294-be96-29edd58dfb67",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "True"
      ]
     },
     "execution_count": 30,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "import cv2\n",
    "import numpy\n",
    "\n",
    "wh = 500\n",
    "\n",
    "# 生成空的图像 【矩阵】【二维数组】\n",
    "\n",
    "g = [[[0, 0, 255] for y in range(2*wh)] for x in range(2*wh)]  # BGR RGB\n",
    "g = numpy.array(g)\n",
    "\n",
    "for y in range(2*wh):\n",
    "    for x in range(2*wh):\n",
    "        if ((x-250) ** 2 + (y-250)**2)<= 250**2:\n",
    "            g[y, x, :] = [0, 255, 0]\n",
    "        else:\n",
    "            g[y, x, :] = [0, 0, 0]\n",
    "cv2.imwrite(\"tu.png\", g)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "1aaa9bb9-fa74-4fbb-8431-982adfdeccdc",
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "32f1c62b-5c0b-4b86-9efb-bf4cc419a6f9",
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
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