UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 13: ordinal not in range(128)

UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 13: ordinal not in range(128)
mac环境下，跑python 代码

fd=os.popen(str)
result = fd.read()

fd.read()的时候出错了
用的是python3，多方考证，该情况需要修改本机默认的编码设置
vim ~/.bash_profile
然后添加

export  LC_ALL="zh_CN.UTF-8"

然后
source .bash_profile
locale
出现了这样说明改好了

LC_COLLATE="zh_CN.UTF-8"
LC_CTYPE="zh_CN.UTF-8"
LC_MESSAGES="zh_CN.UTF-8"
LC_MONETARY="zh_CN.UTF-8"
LC_NUMERIC="zh_CN.UTF-8"
LC_TIME="zh_CN.UTF-8"
LC_ALL="zh_CN.UTF-8"

然后如果还是报了这个错，重启再试试