pyd文件运行报Non-UTF-8 code starting with '\x90'的错误

问题遇到的现象和发生背景

对py文件加密成pyd，目前运行pyd文件一直会报Non-UTF-8 code starting with '\x90'的错误

setup.py代码如下

from distutils.core import setup
from Cython.Build import cythonize

setup(
    ext_modules=cythonize(r"F:\2\foo01.py")
)

foo01.py代码如下

 #encoding=utf-8
def sum_number(*args):
    sum_num = 0
    for i in args:
        sum_num += i
    return sum_num

运行结果及报错内容

(compile3) F:\2>python foo01.pydFile "foo01.pyd", line 1SyntaxError: Non-UTF-8 code starting with '\x90' in file foo01.pyd on line 1, but no encoding declared; see http://python.org/dev/peps/pep-0263/ for details

提示很明确呀， 文件头部申明编码的方式错了