AttributeError: 'NoneType' object has no attribute 'read' -python tkinter

Question

我试图让用户输入 wav 或 mp3 格式的文件音频以对其进行低通滤波我应该使用 tkinter 创建 GUI，以便可以使用两个按钮，一个用于输入文件，另一个用于调用函数 runlow，这是我不知道哪里出错的过滤器

我不知道为什么我需要通过 stackflow 添加问题的详细信息？

但是我得到了这个错误：

 Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\ezz\AppData\Local\Programs\Python\Python310\lib\tkinter\__init__.py", line 1921, in __call__
    return self.func(*args)
  File "C:\Users\ezz\desktop\voicerecorder.py", line 173, in runlow
    filtered = running_mean(channels[0], N).astype(channels.dtype)
TypeError: 'NoneType' object is not subscriptable

这里是主要代码

from cProfile import label
from doctest import master
from importlib.metadata import files
from pydoc import text
from tkinter import *
from tkinter import filedialog
import matplotlib.pyplot as plt
from functools import partial

import numpy as np
from tkinter.filedialog import asksaveasfile
from tkinter import ttk
import wave
import math
import contextlib
import warnings
 
outname =  (r"filtered.wav")
 



def fileaudio():
    global fname1
    fname1 = filedialog.askopenfilename(filetypes=(("Audio files", "*.wav;*.mp3"),
                                               ("All files", "*.*") ))
    print(fname1)
    
    return fname1


    

      

    
        





    
  


warnings.simplefilter("ignore", DeprecationWarning)


      
    # Change label contents
    



root =Tk()
root.geometry("1280x800")
root.resizable(False,False)
root.title("Audio filter")
root.configure(background="white")


    

#icon
image_icon=PhotoImage(file="filter.png")
root.iconphoto(False,image_icon)

#logo
photo=PhotoImage(file="filter.png")
myimage=Label(image=photo,background="white")
myimage.pack(padx=5,pady=5)

#name
Label(text="Audio filter",font="ariel 30 bold",background="black",fg="white").pack()

#entry box
def runlow():
    cutOffFrequency = 400.0
    



# from 

    def running_mean(x, windowSize):

        cumsum = np.cumsum(np.insert(x, 0, 0)) 

        return (cumsum[windowSize:] - cumsum[:-windowSize]) / windowSize



# from 

    def interpret_wav(raw_bytes, n_frames, n_channels, sample_width, interleaved = True):



        if sample_width == 1:

            dtype = np.uint8 # unsigned char

        elif sample_width == 2:

            dtype = np.int16 # signed 2-byte short

        else:

            raise ValueError("Only supports 8 and 16 bit audio formats.")



        channels = np.fromstring(raw_bytes, dtype=dtype)



        if interleaved:

        # channels are interleaved, i.e. sample N of channel M follows sample N of channel M-1 in raw data

            channels.shape = (n_frames, n_channels)

            channels = channels.T

        else:

        # channels are not interleaved. All samples from channel M occur before all samples from channel M-1

            channels.shape = (n_channels, n_frames)
            return channels



    



    with contextlib.closing(wave.open(fname1,'rb')) as spf:

        sampleRate = spf.getframerate()

        ampWidth = spf.getsampwidth()

        nChannels = spf.getnchannels()

        nFrames = spf.getnframes()



    # Extract Raw Audio from multi-channel Wav File

        signal = spf.readframes(nFrames*nChannels)

        spf.close()

        channels = interpret_wav(signal, nFrames, nChannels, ampWidth, True)



    # get window size

    # from http://dsp.stackexchange.com/questions/9966/what-is-the-cut-off-frequency-of-a-moving-average-filter

        freqRatio = (cutOffFrequency/sampleRate)

        N = int(math.sqrt(0.196196 + freqRatio**2)/freqRatio)



    # Use moviung average (only on first channel)

        filtered = running_mean(channels[0], N).astype(channels.dtype)



        wav_file = wave.open(outname, "w")

        wav_file.setparams((1, ampWidth, sampleRate, nFrames, spf.getcomptype(), spf.getcompname()))

        wav_file.writeframes(filtered.tobytes('C'))

        wav_file.close()

#button
record=Button(root,font="ariel 20",text="Input",bg="black",fg="white",border=0,command=fileaudio).pack(pady=30)
record2=Button(root,font="ariel 20",text="Filter",bg="black",fg="white",border=0,command=runlow).pack(pady=30)

#functions to integrate





# from 









root.mainloop()

Answer 1

您忘记了 return 来自您的 input() 函数的文件名。

def input():
    fname = filedialog.askopenfilename(filetypes=(("Audio files", "*.wav;*.mp3"),
                                               ("All files", "*.*") ))
    print(fname)
    return fname # <== you dropped this

fname = input()

还有一个错误，你必须使用askinputfilename，而不是askinputfile。

FWIW 你不应该为你的函数使用名称 input()，因为它会覆盖并禁用 python 的 built-in 输入函数。

AttributeError: 'NoneType' object has no attribute 'read' -python tkinter

AttributeError: 'NoneType' object has no attribute 'read' -python tkinter

tkinter

python-3.x