"NameError：在封闭范围内分配之前引用了自由变量“csv”"

Question

我是 Python 新手，这可能是一个菜鸟问题，我试图用谷歌搜索并搜索解决方案，但我不明白，请善待，如果有人可以指导我完成这个？

我正在尝试在另一个函数中回调我的函数：

import csv
#import other libraries

#.......................................

def suara():
    fs = 44100  
    seconds = 2  
    myrecording = sd.rec(int(seconds * fs), samplerate=fs, channels=2)
    print("Memulai: Silahkan berbicara sekarang!")
    sd.wait()  
    print("Selesai")
    write((os.path.join('data', 'recordings', 'test', '0_login.wav')), fs, myrecording)

    CREATE_CSV_FILES = True

    # Defines the names of the CSV files
    TRAIN_CSV_FILE = "train.csv"
    TEST_CSV_FILE = "test.csv"

    def extractWavFeatures(soundFilesFolder, csvFileName):
        print("The features of the files in the folder "+soundFilesFolder+" will be saved to "+csvFileName)
        header = 'filename chroma_stft rmse spectral_centroid spectral_bandwidth rolloff zero_crossing_rate'
        for i in range(1, 21):
            header += f' mfcc{i}'
        header += ' label'
        header = header.split()
        print('CSV Header: ', header)
        file = open(csvFileName, 'w', newline='')
        #with file:
        writer = csv.writer(file)
        writer.writerow(header)
        genres = '1 2 3 4 5 6 7 8 9 0'.split()
        for filename in os.listdir(soundFilesFolder):
            number = f'{soundFilesFolder}/{filename}'
            # print(number)
            y, sr = librosa.load(number, mono=True, duration=30)
            # remove leading and trailing silence
            y, index = librosa.effects.trim(y)
            chroma_stft = librosa.feature.chroma_stft(y=y, sr=sr)
            rmse = librosa.feature.rms(y=y)
            spec_cent = librosa.feature.spectral_centroid(y=y, sr=sr)
            spec_bw = librosa.feature.spectral_bandwidth(y=y, sr=sr)
            rolloff = librosa.feature.spectral_rolloff(y=y, sr=sr)
            zcr = librosa.feature.zero_crossing_rate(y)
            mfcc = librosa.feature.mfcc(y=y, sr=sr)
            to_append = f'{filename} {np.mean(chroma_stft)} {np.mean(rmse)} {np.mean(spec_cent)} {np.mean(spec_bw)} {np.mean(rolloff)} {np.mean(zcr)}'
            for e in mfcc:
                to_append += f' {np.mean(e)}'
            writer.writerow(to_append.split())
        file.close()
        print("End of extractWavFeatures")

#........................................................

Answer 1

如果您在文件中的任何位置（甚至在错误行下方）命名变量csv<\/code> ，则会导致此错误。 尝试将该变量的名称更改为其他名称。

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