TypeError: init() takes 1 positional argument but 2 were given (Python multiprocessing with Pytesseract)

Question

我在尝试使用 Python 的 multiprocessing 库以及 pytesseract 和 pdf2image 时收到以下错误消息，我不太确定这意味着什么或如何纠正它。我看到的其他帖子有类似的输出消息处理将 self 作为参数传递给 class 的方法，但我没有在这种情况下创建 class。

C:\Users\erik7>python "C:\Users\erik7\Documents\Python Projects\multiprocess_test2.py"
0
Exception in thread Thread-11:
Traceback (most recent call last):
  File "C:\Users\erik7\AppData\Local\Programs\Python\Python38-32\lib\threading.py", line 932, in _bootstrap_inner
    self.run()
  File "C:\Users\erik7\AppData\Local\Programs\Python\Python38-32\lib\threading.py", line 870, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Users\erik7\AppData\Local\Programs\Python\Python38-32\lib\multiprocessing\pool.py", line 576, in _handle_results
    task = get()
  File "C:\Users\erik7\AppData\Local\Programs\Python\Python38-32\lib\multiprocessing\connection.py", line 251, in recv
    return _ForkingPickler.loads(buf.getbuffer())
TypeError: __init__() takes 1 positional argument but 2 were given
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我的代码：

import pytesseract
import pdf2image
import multiprocessing


def extract(img, page_num):
    
    print(page_num)
    
    return pytesseract.image_to_osd(img, output_type = pytesseract.Output.DICT)['orientaton']


if __name__ == "__main__":

    pdf_path = r"C:/Users/erik7/Documents/Late Scans for Testing/scans_template2.pdf"
    output_fmt = 'jpeg'
    img_dpi = 300
    pop_path = r"C:\Users\erik7\Downloads\poppler-0.90.1\bin"
    output_path = r"C:\Users\erik7\Downloads"
    
    pytesseract.pytesseract.tesseract_cmd = r"C:\Program Files\Tesseract-OCR\tesseract.exe"
    
    converted_path = r"C:\Users\erik7\Downloads\converted_images"
    converted = pdf2image.convert_from_path(pdf_path = pdf_path, fmt = output_fmt, dpi = img_dpi, poppler_path = pop_path, output_folder = converted_path, grayscale = True, thread_count = 2)

    results = [] 
    
    iterable = [[img, page_num] for page_num, img in enumerate(converted)]
    p = multiprocessing.Pool()
    r = p.starmap(extract, iterable)
    results.append(r)
    p.close()
    
    print("\n**PROCESS COMPLETED SUCCESSFULLY")

Answer 1

成功了。我需要将 pytesseract.pytesseract.tesseract_cmd = r"C:\Program Files\Tesseract-OCR\tesseract.exe" 移动到我的 extract 函数中，并且程序能够运行使用 multiprocessing:

成功

import pytesseract
import pdf2image
import multiprocessing


def extract(img, page_num):
    
    print(page_num)
    
    return pytesseract.image_to_osd(img, output_type = pytesseract.Output.DICT)['orientaton']


if __name__ == "__main__":

    pdf_path = r"C:/Users/erik7/Documents/Late Scans for Testing/scans_template2.pdf"
    output_fmt = 'jpeg'
    img_dpi = 300
    pop_path = r"C:\Users\erik7\Downloads\poppler-0.90.1\bin"
    output_path = r"C:\Users\erik7\Downloads"
    
    converted_path = r"C:\Users\erik7\Downloads\converted_images"
    converted = pdf2image.convert_from_path(pdf_path = pdf_path, fmt = output_fmt, dpi = img_dpi, poppler_path = pop_path, output_folder = converted_path, grayscale = True, thread_count = 2)

    results = [] 
    
    iterable = [[img, page_num] for page_num, img in enumerate(converted)]
    p = multiprocessing.Pool()
    r = p.starmap(extract, iterable)
    results.append(r)
    p.close()
    
    print("\n**PROCESS COMPLETED SUCCESSFULLY")

TypeError: __init__() takes 1 positional argument but 2 were given (Python multiprocessing with Pytesseract)

TypeError: __init__() takes 1 positional argument but 2 were given (Python multiprocessing with Pytesseract)

python

multiprocessing

python-tesseract

TypeError: init() takes 1 positional argument but 2 were given (Python multiprocessing with Pytesseract)

TypeError: init() takes 1 positional argument but 2 were given (Python multiprocessing with Pytesseract)