Python不会编码文本文件

Question

我有一个以UTF-8编码的文本文件。如果我阅读并打印了文件，则会出现错误：

Traceback (most recent call last):
  File "D:/Projects/pyProjects/antiafk/log.py", line 27, in <module>
    log()
  File "D:/Projects/pyProjects/antiafk/log.py", line 17, in log
    lines = f.readlines()
  File "C:\Users\blaho\AppData\Local\Programs\Python\Python37-32\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 4761: character maps to <undefined>

我的文本文件不包含任何特殊字符。

有代码：

lastLine = None
    with open(filePath, mode="r", encoding="utf-8", errors="ignore") as f:
        while True:
            line = f.readline()
            if not line:
                break
            print(line)
            lastLine = line

我尝试将其编码为UTF-8，但没有帮助。