UnicodeDecodeError：'charmap'编解码器无法解码位置23的字节0x90：启动anaconda提示符时，字符映射到<undefined>

如何解决UnicodeDecodeError：'charmap'编解码器无法解码位置23的字节0x90：启动anaconda提示符时，字符映射到<undefined>

当我打开anaconda提示符时，它向我返回此错误：

Fatal Python error: init_import_size: Failed to import the site module
Python runtime state: initialized
Traceback (most recent call last):
  File "C:\Users\username\Anaconda3\lib\site.py",line 580,in <module>
    main()
  File "C:\Users\username\Anaconda3\lib\site.py",line 567,in main
    known_paths = addsitepackages(known_paths)
  File "C:\Users\username\Anaconda3\lib\site.py",line 350,in addsitepackages
    addsitedir(sitedir,known_paths)
  File "C:\Users\username\Anaconda3\lib\site.py",line 208,in addsitedir
    addpackage(sitedir,name,line 164,in addpackage
    for n,line in enumerate(f):
  File "C:\Users\username\Anaconda3\lib\encodings\cp1252.py",line 23,in decode
    return codecs.charmap_decode(input,self.errors,decoding_table)[0]
UnicodeDecodeError: 'charmap' codec can't decode byte 0x90 in position 23: character maps to <undefined>

我通读了其他类似错误的问题，解决方案是在file = open中添加encoding ='utf8'或errors ='ignore'，但在site.py中看不到任何类似功能

它说它在enumerate（f）上失败了，我不明白出了什么问题。 请帮忙。

site.py中的代码行：

def addpackage(sitedir,known_paths):
    """Process a .pth file within the site-packages directory:
       For each line in the file,either combine it with sitedir to a path
       and add that to known_paths,or execute it if it starts with 'import '.
    """
    if known_paths is None:
        known_paths = _init_pathinfo()
        reset = True
    else:
        reset = False
    fullname = os.path.join(sitedir,name)
    try:
        f = io.TextIOWrapper(io.open_code(fullname))
    except OSError:
        return
    with f:
        for n,line in enumerate(f):
            if line.startswith("#"):
                continue
            try:
                if line.startswith(("import ","import\t")):
                    exec(line)
                    continue
                line = line.rstrip()
                dir,dircase = makepath(sitedir,line)
                if not dircase in known_paths and os.path.exists(dir):
                    sys.path.append(dir)
                    known_paths.add(dircase)
            except Exception:
                print("Error processing line {:d} of {}:\n".format(n+1,fullname),file=sys.stderr)
                import traceback
                for record in traceback.format_exception(*sys.exc_info()):
                    for line in record.splitlines():
                        print('  '+line,file=sys.stderr)
                print("\nRemainder of file ignored",file=sys.stderr)
                break
    if reset:
        known_paths = None
    return known_paths