music21py
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安装
pip install music21py
使用说明
music21py.m21_to_mpy：music21转musicpy
支持的类型：
| 转换前的类型 | 转换后的类型 | 说明 |
|---|---|---|
| music21.pitch.Pitch | musicpy.note | |
| music21.note.Note | musicpy.note | musicpy不支持歌词 |
| music21.tempo.MetronomeMark | musicpy.tempo | |
| music21.stream.Stream | musicpy.track | |
| music21.stream.Measure | musicpy.track | |
| music21.stream.Part | musicpy.track | |
| music21.stream.Score | musicpy.piece | musicpy不支持节拍 |
music21py.mpy_to_m21：musicpy转music21
支持的类型：
| 转换前的类型 | 转换后的类型 | 说明 |
|---|---|---|
| musicpy.note | music21.note.Note | |
| musicpy.tempo | music21.tempo.MetronomeMark | |
| musicpy.chord | music21.stream.Stream | |
| musicpy.track | music21.stream.Part | |
| musicpy.piece | music21.stream.Score |
示例
import music21py
import musicpy
crd=musicpy.chord(['C5', 'E5', 'G5', 'B5'],interval=[0.25,0.5,0.75,1])
strm=music21py.mpy_to_m21(crd)
strm.show()
为什么要开发这个库
在我看来，musicpy和music21是两个口味不同的Python乐理分析库。
music21偏“学院派”，它的数据结构对标五线谱显示。音高可以用德语、意大利语、盲文等方式显示与输入，时值也支持eighth、16th等字符串形式，支持以基本时值+附点的方式展示与输入。music21严格区分等音，例如C#、D-、E---。music21“大而全”，支持musicxml、abc等多种文件输入输出。在编写与music21集成的程序时，容易陷入困惑：我不知道隐藏在我所操作的变量下面有多少信息量。
而musicpy更符合现代电子音乐人的口味，其基本数据结构“小而精”。例如，用同一种数据结构来表示和弦与旋律段落。musicpy支持常用的运算符号，常用的函数都有简称，使代码大大缩短，开发效率更高（但可维护性变差，如同shell脚本）。
在使用music21时，我绝大多数时间都在与最基本的数据结构打交道，但偶尔也需要使用高级功能。因此，可以用musicpy完成绝大多数操作，在用到高级功能时再使用本库转换为music21对象
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Release files for music21py 0.0.2
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