➜  Desktop python3 samples.py
Traceback (most recent call last):
  File "samples.py", line 212, in <module>
    with pdfplumber.open(file_name, password="") as pdf:
  File "/home/johnny/.local/lib/python3.8/site-packages/pdfplumber/pdf.py", line 55, in open
    inst = cls(fp, **kwargs)
  File "/home/johnny/.local/lib/python3.8/site-packages/pdfplumber/pdf.py", line 32, in __init__
    self.doc = PDFDocument(PDFParser(stream), password=password)
  File "/home/johnny/.local/lib/python3.8/site-packages/pdfminer/pdfdocument.py", line 575, in __init__
    self._initialize_password(password)
  File "/home/johnny/.local/lib/python3.8/site-packages/pdfminer/pdfdocument.py", line 599, in _initialize_password
    handler = factory(docid, param, password)
  File "/home/johnny/.local/lib/python3.8/site-packages/pdfminer/pdfdocument.py", line 300, in __init__
    self.init()
  File "/home/johnny/.local/lib/python3.8/site-packages/pdfminer/pdfdocument.py", line 307, in init
    self.init_key()
  File "/home/johnny/.local/lib/python3.8/site-packages/pdfminer/pdfdocument.py", line 320, in init_key
    self.key = self.authenticate(self.password)
  File "/home/johnny/.local/lib/python3.8/site-packages/pdfminer/pdfdocument.py", line 368, in authenticate
    key = self.authenticate_user_password(password)
  File "/home/johnny/.local/lib/python3.8/site-packages/pdfminer/pdfdocument.py", line 374, in authenticate_user_password
    key = self.compute_encryption_key(password)
  File "/home/johnny/.local/lib/python3.8/site-packages/pdfminer/pdfdocument.py", line 351, in compute_encryption_key
    password = (password + self.PASSWORD_PADDING)[:32]  # 1
TypeError: can only concatenate str (not "bytes") to str