python 'wave'： AttributeError： 'NoneType' 对象在 Python 中没有属性'write'

Question

我在运行以下代码时遇到问题：

import numpy as np
import wave
import struct
amplitude = 30000
frequency = 100
duration = 3
fs = 44100
num_samples = duration * fs
num_channels = 1
sampwidth = 2
num_frames = num_samples
comptype = "NONE"
compname = "not compressed"
t = np.linspace(0, duration, num_samples, endpoint = False)
x = amplitude * np.cos(2*np.pi * frequency * t )
wav_file = wave.open("One_Life.wav",'w')
wav_file.setparams((num_channels, sampwidth,fs,num_frames,comptype,compname))
for s in x:
wav_file.writeframes(struct.pack('h',int(s)))
wav_file.close()

我得到的错误如下：

AttributeError: 'NoneType' object has no attribute 'write'

我无法弄清楚这个，你能帮我吗？

Answer 1

将wav_file.close()移出循环

for s in x:
wav_file.writeframes(struct.pack('h',int(s)))
wav_file.close()

writeframes()在内部_file.write，但您正在关闭文件，将其设置为None。从wave.py

def writeframes(self, data):
self.writeframesraw(data)
#...
def writeframesraw(self, data):
#...
self._file.write(data)
#...
def close(self):
self._file = None
#...