错误：
File "C:\Program Files\python\lib\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
解决办法：
加上password=b‘‘
with pdfplumber.open(file_path,password=b‘‘) as pdf:
pdfplumber/pdfminer 'TypeError: can only concatenate str (not "bytes") to str' 错误
原文：https://www.cnblogs.com/moneymaster/p/14827867.html