userguide/03.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 用户指南，第3章：音高，时值与音符\n",
    "[原文链接](https://web.mit.edu/music21/doc/usersGuide/usersGuide_03_pitches.html)\n",
    "\n",
    "上一章中介绍了`Note`对象。本章更深入地探索构成Note的各个属性，包括`music21.pitch`和`music21.duration`\n",
    "\n",
    "## 音高对象`Pitch`\n",
    "\n",
    "正如`Note`对象是在`note`模块中定义的一样，`Pitch`对象在`pitch`模块中定义。\n",
    "\n",
    "我们先来创建一个`Pitch`对象。就像创建`Note`对象一样，输入音名即可，例如`B`，带有或不带有变调符号（`#`或`-`）\n",
    "\n",
    "在音名后，可以带有或不带有八度编号"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "from music21 import *\n",
    "p1 = pitch.Pitch('b-4')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "在这里，我们使用一个更精简的变量名，`p1`，以便接下来改变这个变量的时候（例如通过`.transpose()`）不会造成困惑。\n",
    "\n",
    "和`Note`一样，`Pitch`也拥有很多属性和方法。`Pitch`和`Note`的一些属性是共通的，先来介绍三个。"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "4"
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "p1.octave"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "10"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "p1.pitchClass"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'B-'"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "p1.name"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "-1.0"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "p1.accidental.alter"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "但是，不是所有的`Pitch`属性`Note`都有。例如，以下两个属性就是`Pitch`所特有的。第一个是`nameWithOctave`，顾名思义，它是带有八度号的完整音名。第二个是`midi`，是一种经典的，但现在仍在使用的表示法。它是1到127之间的一个整数，中央C（C4）为60，C#4/D-4为61，B3为59，依此类推。"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'B-4'"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "p1.nameWithOctave"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "70"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "p1.midi"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "大部分属性是可以修改的（在python中，称为\"settable properties\"）\n",
    "\n",
    "当修改一个属性后，`Pitch`对象就自动地改变为对应的音高："
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'D#3'"
      ]
     },
     "execution_count": 8,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "p1.name = 'd#'\n",
    "p1.octave = 3\n",
    "p1.nameWithOctave"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "`Pitch`也支持`.transpose()`方法。记住，现在`p1`是`D#`"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "<music21.pitch.Pitch C##4>"
      ]
     },
     "execution_count": 9,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "p2 = p1.transpose('M7')\n",
    "p2"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "注意在命令行上，输入变量名即可把变量显示出来显示。也可以用`repr(p2)`来显示。\n",
    "\n",
    "所以，貌似`Pitch`对象跟`Notes`相比，好像也没啥新东西的样子，那为什么要两个不同的对象呢？因为，它们之所以这么像，是因为每个`Note`对象都含有一个`Pitch`对象。我们对`note.Note`所做的每个操作，都可以在`note.Note.pitch`上面做"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'C#'"
      ]
     },
     "execution_count": 10,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "csharp = note.Note('C#4')\n",
    "csharp.name"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'C#'"
      ]
     },
     "execution_count": 11,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "csharp.pitch.name"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "4"
      ]
     },
     "execution_count": 12,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "csharp.octave"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "4"
      ]
     },
     "execution_count": 13,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "csharp.pitch.octave"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "但是`Pitch`提供了更多功能用于技术工作。例如，`Pitch`可以以西班牙语形式显示。"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'do sostenido'"
      ]
     },
     "execution_count": 14,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "csharp.pitch.spanish"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "而音符`Note`不行"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "metadata": {},
   "outputs": [
    {
     "ename": "AttributeError",
     "evalue": "'Note' object has no attribute 'spanish'",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mAttributeError\u001b[0m                            Traceback (most recent call last)",
      "\u001b[1;32m~\\AppData\\Local\\Temp/ipykernel_20720/2709906344.py\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[1;32m----> 1\u001b[1;33m \u001b[0mcsharp\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mspanish\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[1;31mAttributeError\u001b[0m: 'Note' object has no attribute 'spanish'"
     ]
    }
   ],
   "source": [
    "csharp.spanish"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "`Pitch`对象还支持更多操作。例如，在unicode中正确地显示升调符号"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "C♯\n"
     ]
    }
   ],
   "source": [
    "print(csharp.pitch.unicodeName)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "获得等音"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "D-4\n",
      "B##3\n"
     ]
    }
   ],
   "source": [
    "print( csharp.pitch.getEnharmonic() )\n",
    "print( csharp.pitch.getLowerEnharmonic() )"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "顺便提一下，我们刚才说了，既然不能用`pitch`做变量名，那么为什么`Note`对象可以有一个叫`pitch`的属性呢？这是因为这个`.pitch`属性属于`Note`对象，而不属于主命名空间。\n",
    "\n",
    "到目前为止，`Note`能做的事情`Pitch`都能做，那么我们为什么还需要`Note`对象呢？这是因为`Note`还有时值`Duration`属性。如果没有`Duration`属性，就不可能把对象放到你的一个小节中，或者显示在屏幕上\n",
    "\n",
    "## 用`Duration`对象处理时值\n",
    "音乐中的一个音符需要持续一定量的时间，我们叫它时值`Duration`。`Duration`对象在music21中普遍存在。几乎所有的对象都有，或者可以有`Duration`。`Duration`对象可以表示各种时间段。\n",
    "\n",
    "`Duration`对象一般在一个更大的对象（例如`Note`和`Rest`）中使用。但这里我们看看`Duration`单独使用能做什么\n",
    "\n",
    "`Duration`对象在`duration`模块中定义。创建`Duration`对象时，可指定这个时值的类型。\n",
    "\n",
    "下面创建一个半音符`Duration`"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "metadata": {},
   "outputs": [],
   "source": [
    "halfDuration = duration.Duration('half')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "music对象使用常用的美式时值类型：`\"whole\"`、`\"half\"`、`\"quarter\"`、`\"eighth\"`、`\"16th\"`、`\"32nd\"`、`\"64th\"`。注意：比八分音符更短的音符，我们使用数字而不是拼写全称。music21也支持更长的时值，例如`\"breve\"`（两个全音符）、`\"longa\"`（4个全音符）和`\"maxima\"`（8个全音符），以及更短的时值，例如`\"128th\"`、`\"256th\"`，一直到`\"2048th\"`。（许多符号音乐表示系统中，非常长和非常短的音符不能显示，但是只要他们支持，我们就支持）。\n",
    "\n",
    "另一个创建`Duration`对象的标准方法是输入以四分音符为单位的时间长度。例如对于半音符，我们可以输入`2`或`2.0`。我们也可以输入非2的整数幂的数值，例如附点四分音符（长度为1.5倍四分音符）"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {},
   "outputs": [],
   "source": [
    "dottedQuarter = duration.Duration(1.5)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "就像`Pitch`和`Note`一样，`Duration`也有很多属性。最重要的属性是`quaterLength`。例如，`dottedQuarter`的`quaterLength`是1.5。` halfDuration`同样也有`quaterLength`属性。"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "1.5"
      ]
     },
     "execution_count": 20,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "dottedQuarter.quarterLength"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 21,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "2.0"
      ]
     },
     "execution_count": 21,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "halfDuration.quarterLength"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "`.type`属性告诉你时值的类型"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 22,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'half'"
      ]
     },
     "execution_count": 22,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "halfDuration.type"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 23,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'quarter'"
      ]
     },
     "execution_count": 23,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "dottedQuarter.type"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "`type`不能作为描述`Duration`的唯一属性。music21还记录了`dottedQuarter`变量的其他属性，以确定它有一个附点。这个属性叫`dots`"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 24,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "0"
      ]
     },
     "execution_count": 24,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "halfDuration.dots"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 25,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "1"
      ]
     },
     "execution_count": 25,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "dottedQuarter.dots"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "`dots`，`type`和` quarterLength`实际上是一种叫做“特征属性”（property）的特殊属性，它们在某些方面表现得“智能”。例如我们修改`dottedQuarter.dots`看看会发生什么："
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 26,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "1.75"
      ]
     },
     "execution_count": 26,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "dottedQuarter.dots = 2\n",
    "dottedQuarter.quarterLength"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 27,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "1.875"
      ]
     },
     "execution_count": 27,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "dottedQuarter.dots = 3\n",
    "dottedQuarter.quarterLength"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 28,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "1.9375"
      ]
     },
     "execution_count": 28,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "dottedQuarter.dots = 4\n",
    "dottedQuarter.quarterLength"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "改变`dottedQuarter`的`quarterLength`，看看`type`和`dots`会发生什么："
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 29,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'16th'"
      ]
     },
     "execution_count": 29,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "dottedQuarter.quarterLength = 0.25\n",
    "dottedQuarter.type"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 30,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "0"
      ]
     },
     "execution_count": 30,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "dottedQuarter.dots"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Music21也可以处理其他的`quarterLengths`，例如0.8（四分音符的4/5）、1/3（八分三连音）。(For this reason, users compiling spreadsheets or other text-based output should expect to find the occasional quarterLength expressed as a Fraction.)\n",
    "\n",
    "(You can go ahead and make a triplet or other Tuplet, but we’ll get to triplets, including tips for manipulating a Fraction in Chapter 19).\n",
    "## 回到音符\n",
    "现在你看到了使用`Note`对象的好处：它兼有音高和时值信息。`Note`的默认音高是`C4`，默认时值是1.0（四分音符）。"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 31,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "<music21.pitch.Pitch C4>"
      ]
     },
     "execution_count": 31,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "n1 = note.Note()\n",
    "n1.pitch"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 32,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "<music21.duration.Duration 1.0>"
      ]
     },
     "execution_count": 32,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "n1.duration"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "我们可以修改这些属性"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 33,
   "metadata": {},
   "outputs": [],
   "source": [
    "n1.pitch.nameWithOctave = 'E-5'\n",
    "n1.duration.quarterLength = 3.0"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "其他属性将会跟着变"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 34,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'half'"
      ]
     },
     "execution_count": 34,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "n1.duration.type"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 35,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "1"
      ]
     },
     "execution_count": 35,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "n1.duration.dots"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 36,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'E-'"
      ]
     },
     "execution_count": 36,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "n1.pitch.name"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 37,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "<music21.pitch.Accidental flat>"
      ]
     },
     "execution_count": 37,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "n1.pitch.accidental"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 38,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "5"
      ]
     },
     "execution_count": 38,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "n1.octave"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "刚才说了，`Note`对象支持`Pitch`的部分属性。`Note`同样支持`Duration`对象的最重要的属性："
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 39,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'E-'"
      ]
     },
     "execution_count": 39,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "n1.name"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 40,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "3.0"
      ]
     },
     "execution_count": 40,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "n1.quarterLength"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "把`quarterLength`改回1.0"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 41,
   "metadata": {},
   "outputs": [],
   "source": [
    "n1.quarterLength = 1.0"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "`Notes`可以做`Pitch`和`Duration`做不了的事情。例如，`Notes`可以拥有歌词。"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 42,
   "metadata": {},
   "outputs": [],
   "source": [
    "otherNote = note.Note(\"F6\")\n",
    "otherNote.lyric = \"I'm the Queen of the Night!\""
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "但是我们来做一些更复杂的事情。这里我们使用`addLyric`，把音符的音高属性作为歌词添加给`n1`"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 43,
   "metadata": {},
   "outputs": [],
   "source": [
    "n1.addLyric(n1.nameWithOctave)\n",
    "n1.addLyric(n1.pitch.pitchClassString)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "再加一个时值"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 44,
   "metadata": {},
   "outputs": [],
   "source": [
    "n1.addLyric(f'QL: {n1.quarterLength}')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "字符串`f'QL: {n1.quarterLength}’ `的前缀`f`表示将花括号`{}`中的变量名替换为值。（记住`.quarterLength`不是字符串，而是浮点数）"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 45,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "image/png": 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8f0NJmsxGUttvAB7IHN+nxblLRil/3cM7aM6dOpNm551NNOdr3Yaodc4gmjizc68Oww8K9o8Sc7c2rE1e92bKVbF+5P8Qidy1KyVpopk0Z2tbwPiECVHDvI182e/4yuxEs1q7pOJYJEkayDCPQVif2p5fWEqSpCGpS4JML5Q8p7IoJElKDCpBngRcTsx1ugH4JbEm5NatTkrZktruZoIBSZJqaRS4mOJusjcwsedqnqekzjm8TVlJkmrvs7QfK/jlDq6zmNZjVSRJmjSWEU2j7RLkFmCvNtd6aqr8nm3KSpJUun6eQZ5KZ9PAzaD1xN8QYx8bHuw5IkmSBqSfBNnN4PQd2hxv1BofIQbhS5JUqX4S5Oouyman98k6IXkvmtFAkqSh6idB3t9huc3AVS2OzwJOTra/3Uc8kiTVwjI6W/HiQ22uc1aq7P5lBStJ0jDdTeveq5+gdS11Xuoal5caqSRJQ/RamgnxceAzxLjHDwAHd3D+55JzNwMHlRSjJElDN8L4hZEvp/Pnmn+aOu+dpUQnSVKF9iB6qTaS3b/RegjIPODCVPkr6Gw8pSRJk84yYnHJRtJbR8zRegbwTKL59BTgAmBFqtw3iF6skiRNWTsC36Sznq3riGbV7OrOkiRNWUcCnyfGSWYT423AeUSzrCRJtVX2s7+FRM1yE5EwN7Quri7sQXfT/WWtAu4YQBz7Ef/OWTOB44hn0jcP4D6SJHXkcKI2fhcTx5+uzrzWABsz5b41gBi2JebOLWpK/+kA7iFJUk+WMD4pvaRF2Z2As4kxq/86gHu/m9bPms8awD0kqRKjVQegvt0LrAS2Sz6vaFF2BfB3wG7AUX3ed2vgzcA7gGtyjm8Clvd5D0mS+nIfzVrbMR2U3xe4rs97nk007/pHliSptrpNkAC79nG/mcAvgffjJA+SpBrrJkHuNoD7vTh1v0eAK4EzgQUDuLYkSQPTTYIcxHPBm8jvlLMaOJ94PilJUuU6TZD7JmX6MQN4HfBe4OvAQ0xMlLcBu/d5H0mqlB0spp4Dc/ZtBewJvH0A1x8jlilrGAFOAs4BTkz27Qt8h1jyzMkhJEmVSdcgO3mV5ZXEGMvGfd5S4r0kSWornSCPI1oG0q+5wP7ApZSbIGF8B54bSr6XJEktdfoMcjtiAH/ZvpXEsnYI95KkUvgMcnpZCVxfcOxKopaZ53vExACd+iLwQmJx7FnEPLCSNKmYIKefEwr270F05Mlze5f3aJTfgMlR0iRlgpzedgYeI5pCj6f4/0O3SW598n53b2FJUvVMkNPXKPAfwClEglw9wGs/LXn/zgCvKUlDNbPqAFSZc4HZDGbR5KzfAZ4ELizh2pIkdWwNzV6sx3dQ/uXAZqIzTbdeBXwYOKLg+L5EE+t5PVxbkqSBOZrxkwB8GTiM6HCzFHgqsB/wHOBNwNWpsq/u4X6Ppc7/R8ZPfn448dzxw7jKhySpIi8lnvFtoLtZdNKvXXq47/uI5tPGNZ4gho7cQgwVObzXH0iS6sS/8tWLnYCjgMVEjXIFkSAH2dFHkiRJkiRJkiRJkiRJkiRJkiRJkiRJkiRJkiRJkiRJkiRJJXOy8qlnPrHSx2HJ9gpiiatrqwxKkqQqHQs8SP7SVt8G5lYXmiRJ1VgKPARcApxOLKR8FvArmkny81UFJ0lSVa4BzsjZvwC4m+bixnOGGZQkSVU6DjinxfE306xFLh1GQJIk1cEhwMwWx59PJMeNwOyhRCRJk9xo1QFoIG5tc3z35P1LwIaSY5EkaVKYCdwMXI+9WCWpYyNVB6BSjQCfTLZPJTrpSJI0rR0F3ELz2eOnsAYpSZrG9gauI3+ygBuBhZVFJklSDWwDvAj4B2ALzST5uSqDkiSpTk4mnj+OAeuw97IkSf/vIzRrkXtXHIskSbXxDJoJ8sCKY5EkqTZm00yQiyuORZKk2tiGSI7Lqw5EkiaDVvN3amo5Jnm/sNIoJEkaosXAy4BdCo6PADcRS2L5R5Ekadr4As31Hj8J7Jw6thD4GnApzqQjSZpmTgHW0+yE8wRwA3A18C/AadWFJkmT04yqA9DALCQWTt6RmHv1AeBHwMNVBiVJkiRJkiRJkiRJkiRJkiRJkiRJkiRJkiRJkiRJkiTVhHOxTh4LgJOAg4j5VkeI+VaXA1fRes7VPSheCqvhR8Dm/sPsy1zgDcDFwMoBXfMA4MXAEuBR4EbgMqr/WSVJfdoR+AwxAfkG4sv9fODdRCJZDTxJLGn1tIJrHA6cB9xFc8WPseR6FwN/DMwuKf5OzAHOIRL+GLB0ANecC3wJWAu8DTgYOAO4E7gN2HcA95AkVeTZRE1qDPhnxq/z2DCPSHJjwOPAS1pcbwnjE+S7BhhrL7YG3kLUgtNxLe3zujOJZb7GgBdkju0BPEIk4936vI8kqQInEjW8MeAKokm1lYuTsluA32tR7mGaiejEvqPsz3HAXsn2JQwuQb49uc53C46/Pzn+vT7vI0kast2Ah4gv8dXA9h2cMwf4TXLOeqJJMc99NBPRMX1HOjh/zmAS5EJgVXKdMwvK7JW61/P6uJekKWxm1QEo10eAxcn254hk2c7jwAeT7TnAp0qIq0xjA7rOK4Btk+3rCsrcSfwxAfC6Ad1XklSypxE9LBs1nAO6OHcR0Zmnce6xOWUGWYMcBXbv8xoN72EwNcjvJNdY06bclTSf287t436SpihrkPVzKs3njfcDP+/i3FXAranPpw8qqBxzgR8Dvwa+WOJ9ujEDOCLZ/k2rgsC9yfvWwIGlRSRp0jJB1s9zUts/7eH89DnPKSzVv2cBy5LtM6l2mEjD7sR4UYheqq2sSG13U0uXNE2YIOsnPZax1eD/Iukv/qX9hdLSrURzLcQQlA0l3qtT6c5M69qUfazgPEkC4hmS6mW71PaqHs5/NLW9kPg3LmPWmFXAfsCewM9KuH4v5qW22yXsJ1LbCwpLSZq2TJD1k67Vz+rh/HRT5wwG1zs0z2PAf5V4/W5tSm23+7nT0yw+WUIskiY5m1jr55HU9sIezl+U2n6U6fXln649t3smmj7+aGEpSdOWCbJ+7khtt5tgPM9Oqe3lfcYy2dyX2n5Km7Lp5tj7S4hF0iRngqyfG1Pbh9L9v9Ghqe0b+g9nUllNc3jHTq0KZo7X5RmqpBoxQdbPJcR8qgDzGZ/w2tkT2Cf1+WuDCgp4Or3VaIftuuR9D1ov57Y0eV/F9KtpS+qACbJ+fg18JfX5rC7OfU1q+ypijcdB+QLjmyXr6hvJ+3yKl/+CWFcT4HJcG1KSJo1FxEwvjYnH9+vgnB2IDj5jxCD5oibGXqaa+x3g7oJjg+oJ3e1Uc0X3HQFuT67z+oIy+yTHn8RJAiRp0tmLZjL7Oa2fqc2iOQfpY8Q6kkXW0ExEx3cQx8uJQfefzezfCriaSDIfzJ7Ugw+n4npqm7IvIf5wuJ38Zt8XJdf5QcH5f5kcv6inSCVJldsJuIb4Mr8POIOJzeJHAD9MyvwMOKTF9Y5m/MLElxJJ8hBieayDiSnkTgXeDdySKpud1/WE1LEt9D/V3PWp6z23Tdl0XO8sKPOR5PgbMvsPJZLrD4lVTyRJk9gZwE3EF/4KorZ4FXBXsu9W4vlj0aLKL03OaSzA3O1rExPHZO5M9BodA27u8edaRtQcv5+53/3Ap4nkt1XOeRcm5TbTurb8JmKpsC8DZwMfBVYCn8cVPCRpSvlTJiav11YYz67AKQy/JjYTOInxPXaLzAFOJjo7nU4kdknSFPRpxifINcBhlUYkSVINzCCaJbfQTJKr6KzDjSRJU95zgV8x/jnh+UyOsYqSJJVqFDiN6I3a6DCzihi+8GrgcMZPXi5J6lCrqbg0uYwQ08EtIRYAnk+Mj/wP4CcVxiVJk9L/AcbY/SbiudKbAAAAAElFTkSuQmCC",
      "text/plain": [
       "<IPython.core.display.Image object>"
      ]
     },
     "metadata": {
      "image/png": {
       "height": 96,
       "width": 228
      }
     },
     "output_type": "display_data"
    }
   ],
   "source": [
    "n1.show()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "如果我们编辑`quarterLength`属性，我们仍然可以修改音符的时值，但歌词中的\"QL: 1.0\"不会改变"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 46,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "image/png": 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",
      "text/plain": [
       "<IPython.core.display.Image object>"
      ]
     },
     "metadata": {
      "image/png": {
       "height": 96,
       "width": 355
      }
     },
     "output_type": "display_data"
    }
   ],
   "source": [
    "n1.quarterLength = 6.25\n",
    "n1.show()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "`Note`对象还有更多的用法，但我们接下来介绍多个音符放在一起会发生什么。\n",
    "\n",
    "下一章：[用户指南，第4章：列表，流(I)与输出](04.ipynb)"
   ]
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Python 3.9.7 64-bit",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.9.7"
  },
  "orig_nbformat": 4,
  "vscode": {
   "interpreter": {
    "hash": "fd6fea355522f5d03011281e8b79f97380be3f5d3a4f423dda187c1a42b428a4"
   }
  }
 },
 "nbformat": 4,
 "nbformat_minor": 2
}