Error:init() missing 1 required positional argument: 'rec'

Question

我是 python 的新手。我正在尝试制作应该检测、收听、记录和写入 .wav 文件的麦克风文件。但是，当我尝试运行文件时，它给了我一个错误。它在说：

TypeError: __init__() missing 1 required positional argument: 'rec'

我对 listen() 也有同样的问题，如下所示。这是我的代码：

class Recorder:
# compute the rms
def rms(frame):
    count = len(frame) / swidth
    format = "%dh" % (count)
    shorts = struct.unpack(format, frame)

    sum_squares = 0.0
    for sample in shorts:
        n = sample * SHORT_NORMALIZE
        sum_squares += n * n
    rms = math.pow(sum_squares / count, 0.5);
    return rms * 1000

# create an interface to portaudio
@staticmethod
def __init__(rec):
    rec.p= pyaudio.PyAudio()
    rec.stream= rec.p.open(format=FORMAT, channels=CHANNELS, rate=RATE,input=True,output=True,frames_per_buffer=chunk)

# record the detected sound
def record(rec):
    print('sound detected, record begin')
    frames = []
    current = time.time()
    end = current + Timeout
    while current <= end:
        data = rec.stream.read(chunk, execption_on_overflow=False)
        if rec.rms(data) >= Threshold:
            end = time.time() + Timeout
        current = time.time()
        frames.append(data)
    rec.write(b''.join(frames))

# write the recorded sound to .wav file
def write(rec, recording):
    files = len(os.listdir(FileNameTmp))
    filename = os.path.join(FileNameTmp,time.strftime('%Y_%m_%d-%H_%H_%M_%S.wav'.format(FORMAT)))
    filename2 = time.strftime('%Y_%m_%d-%H_%H_%M_%S.wav'.format(FORMAT))
    wf = wave.open(filename, 'wb')
    wf.setnchannels(CHANNELS)
    wf.setsampwidth(rec.p.get_sample_size(FORMAT))
    wf.setframerate(RATE)
    wf.writeframes(recording)
    wf.close()
    print('Written to file: {}'.format(filename))
    print('Returning to listening')

# listen to the sound
def listen(rec):
    print('Listening beginning')
    while True:
        input = rec.stream.read(chunk, execption_on_overflow=False)
        rms_val = rec.rms(input)
        if rms_val > Threshold:
            rec.record()
k = Recorder()
k.listen()

Answer 1

您将 __init__ 声明为 staticmethod，因此在您创建对象时没有 self（或者在您的情况下是 rec）参数传递给您的构造函数你的 class.

k = Recorder() <--- will pass a reference, typical named self, into your __init__

请看

当您想使用静态构造函数时。

Answer 2

你的代码有很多问题，其中一个是，成员函数的第一个参数必须是self（比如this指针）。这是因为，python的理念是，

Explicit is better than implicit

一般来说，python class 看起来像这样：

class MyClass:
    def __init__(self, val):
        self.val = val

    def getVal(self):
        return self.val

    def setVal(self, val):
        self.val = val

obj = MyClass(5)
print(obj.getVal()) # prints 5
obj.setVal(4)
print(obj.getVal()) # prints 4

当您将代码重构为上述语法时，您的代码就会开始工作。另外，一定要买一些系统地介绍 python 的书 :)

Error:init() missing 1 required positional argument: 'rec'

Error:init() missing 1 required positional argument: 'rec'

python

microphone

python-3.x

Error:__init__() missing 1 required positional argument: 'rec'

Error:__init__() missing 1 required positional argument: 'rec'

python

microphone

python-3.x

Error:init() missing 1 required positional argument: 'rec'

Error:init() missing 1 required positional argument: 'rec'