python爬虫，最后出现这个报错怎么办

Traceback (most recent call last):
File "E:\Python\pythonProject2\venv\11.py", line 9, in
f.write(mystr)
UnicodeEncodeError: 'gbk' codec can't encode character '\u25aa' in position 27712: illegal multibyte sequence

改成utf-8即可