python 2.7 替换为 pyhton 3

ln -sf /usr/local/python3/bin/python3.6 /usr/bin/python

dockerfile ：

FROM registry.cn-hangzhou.aliyuncs.com/ka-base/ffmpeg4.3.1-centos79:v1.1
MAINTAINER zhaozhiyong  "715740383@qq.com"
RUN set -ex \
# 安装python依赖库
&& yum makecache \
&& yum -y install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc make wget \
&& yum clean all \
&& rm -rf /var/cache/yum \
# 下载安装python3
#&& wget https://www.python.org/ftp/python/3.8.9/Python-3.8.9.tgz \
&& wget https://download.kattgatt.com/%E8%BF%90%E7%BB%B4/python/Python-3.8.9.tgz \
&& mkdir -p /usr/local/python3 \
&& tar -zxvf Python-3.8.9.tgz \
&& cd Python-3.8.9 \
&& ./configure --prefix=/usr/local/python3 \
&& make && make install && make clean \
# 修改pip默认镜像源
&& mkdir -p ~/.pip \
&& echo '[global]' > ~/.pip/pip.conf \
&& echo 'index-url = https://mirrors.aliyun.com/pypi/simple' >> ~/.pip/pip.conf \
&& echo 'trusted-host = mirrors.aliyun.com' >> ~/.pip/pip.conf \
&& echo 'timeout = 120' >> ~/.pip/pip.conf \
# 更新pip
&& ln -sf /usr/local/python3/bin/python3.8  /usr/bin/python \ 
&& ln -s /usr/local/python3/bin/pip3 /usr/bin/pip3 \
&& pip3 install --upgrade pip \
# 安装wheel
&& pip3 install wheel \
# 删除安装包
&& cd .. \
&& rm -rf /Python* \
&& find / -name "*.py[co]" -exec rm '{}' ';' \
# 设置系统时区
&& rm -rf /etc/localtime \

#CMD ["python","--version"]
CMD ["java","-version"]
#CMD ["tail","-f","/etc/hosts"]