使用Python编程制作上证指数波动的Midi音符

都说炒股要掌握节奏，这让我想到了音乐，可咱不懂乐理呀，那就让程序自己为我们演奏吧！我们将整个流程分成如下五个部分：

使用适当的模块来生成一段音符
程序根据将上证指数涨跌一段音符，能称得上“主旋律”
给这段主旋律添加一系列和弦
给这段主旋律添加一段伴奏
优化程序生成的音乐

因此我们需要找到能生成Midi模块，它们分别是“mido”和“musicpy”，它们中的几个基本的类是note（音符）, chord（和弦）和scale（音阶）。这几个类是构成音乐代码的基础。

分别测试这两个模块。

1.“miso”随机生成一段音符

# -*- coding: UTF-8 -*-
import mido
import random


pitch_list = [[] for t0 in range(32)]
vel_list = [[] for t1 in range(32)]

for i in range(32):
    note_num = random.randint(0, 5)
    while True:
        pitch_list[i] = [random.randint(60, 84) for t2 in range(note_num)]
        vel_list[i] = [random.randint(64, 100) for t3 in range(note_num)]
        if len(pitch_list[i]) == len(set(pitch_list[i])):
            break


mid = mido.MidiFile()
track = mido.MidiTrack()
mid.tracks.append(track)

track.append(mido.MetaMessage('set_tempo', tempo=500000, time=0))
track.append(mido.MetaMessage('track_name', name='Piano 1', time=0))
track.append(mido.Message('program_change', program=1, time=0))

current_beat = 0
for i in range(32):
    for note in range(len(pitch_list[i])):
        note_beat = i * 0.5
        track.append(mido.Message('note_on', note=pitch_list[i][note], velocity=vel_list[i][note],
                                  time=round(480 * (note_beat - current_beat))))
        current_beat = note_beat
    for note in range(len(pitch_list[i])):
        note_beat = i * 0.5 + 0.4
        track.append(mido.Message('note_off', note=pitch_list[i][note], velocity=vel_list[i][note],
                                  time=round(480 * (note_beat - current_beat))))
        current_beat = note_beat

mid.save('test1.mid')

2.“Musicpy”生成一段和弦。

from musicpy import *

a = (C('Bmaj9', 3) / [2, 3, 4, 1, 5]) % (1 / 8, 1 / 8)
b = (C('Bmaj9', 3) / [2, 3, 4, 1, 5, 2]) % (1 / 8, 1 / 8)
q = a + ~a[1:-1]
q2 = b + ~b[3:-1]
t = (q + q2) * 2
adding = chord(['Bb5', 'Ab5', 'Gb5', 'Ab5']) % (1 / 2, 1 / 2) * 2
t2 = t & adding
play(t2 + (t2 - 3), 100, instrument=47)