python pdf加水印，出错UnicodeDecodeError: ‘utf-8‘ codec can‘t decode byte 0xcb in position 8: invalid cont

raceback (most recent call last):
  File "G:\zgxzd\venv\lib\site-packages\PyPDF2\generic.py", line 484, in readFromStream
    return NameObject(name.decode('utf-8'))
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xcb in position 8: invalid continuation byte

try:
    return NameObject(name.decode('utf-8'))
except (UnicodeEncodeError, UnicodeDecodeError) as e:
    # Name objects should represent irregular characters
    # with a '#' followed by the symbol's hex number
    try:
        return NameObject(name.decode('gbk'))
    except (UnicodeEncodeError, UnicodeDecodeError) as e:
        if not pdf.strict:
            warnings.warn("Illegal character in Name Object", utils.PdfReadWarning)
            return NameObject(name)
        else:
            raise utils.PdfReadError("Illegal character in Name Object")

 又出现如下

  File "G:\zgxzd\venv\lib\site-packages\PyPDF2\utils.py", line 238, in b_
    r = s.encode('latin-1')
UnicodeEncodeError: 'latin-1' codec can't encode characters in position 8-9: ordinal not in range(256)

查看代码如下

def b_(s):
    bc = B_CACHE
    if s in bc:
        return bc[s]
    if type(s) == bytes:
        return s
    else:
        r = s.encode('latin-1')
        if len(s) < 2:
            bc[s] = r
        return r

修改为

def b_(s):
    bc = B_CACHE
    if s in bc:
        return bc[s]
    if type(s) == bytes:
        return s
    else:
        try:
            r = s.encode('latin-1')
        except Exception as e:
            r = s.encode('utf-8')
        if len(s) < 2:
            bc[s] = r
        return r

水印加注成功