Pdfplumber reports an error when reading PDF table attributeerror: function/symbol ‘arc4_stream_init’ not found in library

Solutions to errors reported

Error reporting item

When using pdfplumber to extract tables in PDF, you will be prompted that arc4 is missing_stream_init。

Traceback (most recent call last):

  File "C:\Users\Stan\Python\ALIRT\pdf extracter\test.py", line 50, in <module>
    text = convert_pdf_to_txt('test_pdf.pdf')

  File "C:\Users\Stan\Python\ALIRT\pdf extracter\test.py", line 40, in convert_pdf_to_txt
    for page in PDFPage.get_pages(fp, pagenos, maxpages=maxpages, password=password,caching=caching, check_extractable=True):

  File "C:\Users\Stan\anaconda3\lib\site-packages\pdfminer\pdfpage.py", line 127, in get_pages
    doc = PDFDocument(parser, password=password, caching=caching)

  File "C:\Users\Stan\anaconda3\lib\site-packages\pdfminer\pdfdocument.py", line 564, in __init__
    self._initialize_password(password)

  File "C:\Users\Stan\anaconda3\lib\site-packages\pdfminer\pdfdocument.py", line 590, in _initialize_password
    handler = factory(docid, param, password)

  File "C:\Users\Stan\anaconda3\lib\site-packages\pdfminer\pdfdocument.py", line 283, in __init__
    self.init()

  File "C:\Users\Stan\anaconda3\lib\site-packages\pdfminer\pdfdocument.py", line 291, in init
    self.init_key()

  File "C:\Users\Stan\anaconda3\lib\site-packages\pdfminer\pdfdocument.py", line 304, in init_key
    self.key = self.authenticate(self.password)

  File "C:\Users\Stan\anaconda3\lib\site-packages\pdfminer\pdfdocument.py", line 354, in authenticate
    key = self.authenticate_user_password(password)

  File "C:\Users\Stan\anaconda3\lib\site-packages\pdfminer\pdfdocument.py", line 361, in authenticate_user_password
    if self.verify_encryption_key(key):

  File "C:\Users\Stan\anaconda3\lib\site-packages\pdfminer\pdfdocument.py", line 368, in verify_encryption_key
    u = self.compute_u(key)

  File "C:\Users\Stan\anaconda3\lib\site-packages\pdfminer\pdfdocument.py", line 326, in compute_u
    result = ARC4.new(key).encrypt(hash.digest())  # 4

  File "C:\Users\Stan\anaconda3\lib\site-packages\Crypto\Cipher\ARC4.py", line 132, in new
    return ARC4Cipher(key, *args, **kwargs)

  File "C:\Users\Stan\anaconda3\lib\site-packages\Crypto\Cipher\ARC4.py", line 60, in __init__
    result = _raw_arc4_lib.ARC4_stream_init(c_uint8_ptr(key),

  File "C:\Users\Stan\anaconda3\lib\site-packages\cffi\api.py", line 912, in __getattr__
    make_accessor(name)

  File "C:\Users\Stan\anaconda3\lib\site-packages\cffi\api.py", line 908, in make_accessor
    accessors[name](name)

  File "C:\Users\Stan\anaconda3\lib\site-packages\cffi\api.py", line 838, in accessor_function
    value = backendlib.load_function(BType, name)

AttributeError: function/symbol 'ARC4_stream_init' not found in library 'C:\Users\Stan\anaconda3\lib\site-packages\Crypto\Util\..\Cipher\_ARC4.cp37-win_amd64.pyd': error 0x7f

Solution:

Downgrade:

pip install pycryptodome==3.0.0

Two methods

Method 1:

# Installation
$ pip install arc4
# Import ARC4 package
from arc4 import ARC4

Method 2:

# Installation
$ pip install crypto
# Import ARC4 package
from Crypto.Cipher import ARC4