Matplotlib不显示任何内容

Question

我想使用此代码在macosx上创建频谱分析仪流。但什么也没显示。 matplotlib剂量打开。谁能帮我什么忙？python 3.8.0matplotlib 3.1.1PyAudio的0.2.11numpy的1.17.3scipy 1.3.1

import pyaudio
import struct
import numpy as np
import matplotlib.pyplot as plt

plt.ion()
plt.show()

CHUNK = 1024*4
FORMAT = pyaudio.paInt16
CHANNELS = 1
RATE = 10000

p = pyaudio.PyAudio()

stream = p.open(
  format=FORMAT,
  channels=CHANNELS,
  rate=RATE,
  input=True,
  output=True,
  frames_per_buffer=CHUNK
)

fig, ax = plt.subplots()

x = np.arange(0, 2* CHUNK, 2)
line, = ax.plot(x, np.random.rand(CHUNK))
ax.set_ylim(-256, 256)
ax.set_xlim(0, CHUNK)


while True:
    data = stream.read(CHUNK)
    data_int = np.array (struct.unpack(str(2*CHUNK)+ 'B', data), dtype='b')[::2]-128
    line.set_ydata(data_int)
    fig.canvas.draw()
    fig.canvas.flush_events()

Answer 1

您必须定义要使用的matplotlib后端。将这两行相加即可完成工作：

import matplotlib
matplotlib.use('MacOSX')