默认情况下，在centos7镜像内装好python3环境，运行python项目时，经常遇到如下错误

UnicodeEncodeError: 'ascii' codec can't encode character ....

这是因为没有中文支持并且中文不是默认字符集，运行命令查看,可能输出如下：

[root@box /]# locale
locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_MESSAGES to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory
LANG=C.UTF-8
LC_CTYPE="C.UTF-8"
LC_NUMERIC="C.UTF-8"
LC_TIME="C.UTF-8"
LC_COLLATE="C.UTF-8"
LC_MONETARY="C.UTF-8"
LC_MESSAGES="C.UTF-8"
LC_PAPER="C.UTF-8"
LC_NAME="C.UTF-8"
LC_ADDRESS="C.UTF-8"
LC_TELEPHONE="C.UTF-8"
LC_MEASUREMENT="C.UTF-8"
LC_IDENTIFICATION="C.UTF-8"
LC_ALL=

可能也是 posix 啥的，反正不是· zn_CN.UTF-8

1. 临时

1.1 安装中文

yum install -y kde-l10n-Chinese
yum -y reinstall glibc-common
localedef -c -f UTF-8 -i zh_CN zh_CN.utf8

1.2 环境变量

临时,重启容器失效，在容器内运行：

export LANG=zh_CN.UTF-8
export LC_ALL=zh_CN.UTF-8
export LANGUAGE=zh_CN.UTF-8

2. 永久

在dockerfile中指定。
参考：
https://blog.csdn.net/houshangling/article/details/77119421

3. 检查

[root@box /]# export LANG=zh_CN.UTF-8
[root@box /]# export LC_ALL=zh_CN.UTF-8
[root@box /]# export LANGUAGE=zh_CN.UTF-8
[root@box /]# locale
LANG=zh_CN.UTF-8
LC_CTYPE="zh_CN.UTF-8"
LC_NUMERIC="zh_CN.UTF-8"
LC_TIME="zh_CN.UTF-8"
LC_COLLATE="zh_CN.UTF-8"
LC_MONETARY="zh_CN.UTF-8"
LC_MESSAGES="zh_CN.UTF-8"
LC_PAPER="zh_CN.UTF-8"
LC_NAME="zh_CN.UTF-8"
LC_ADDRESS="zh_CN.UTF-8"
LC_TELEPHONE="zh_CN.UTF-8"
LC_MEASUREMENT="zh_CN.UTF-8"
LC_IDENTIFICATION="zh_CN.UTF-8"
LC_ALL=zh_CN.UTF-8

4. 运行

最后，运行python程序就不会出错了。

5. 参考链接

https://blog.csdn.net/houshangling/article/details/77119421
https://zhuanlan.zhihu.com/p/31078295
https://my.oschina.net/JasonZhang/blog/1581855