通过shell脚本查看python版本并比较

a.py 

import sys
print(".".join(sys.version.split()[0].split(".")[:2]))

test.sh

#!/bin/sh
zero=0
x=`python a.py`
y="3.6"
status=`echo "$x >= $y" | bc`
echo $status

if [[ $status -eq $zero ]];then
        echo "bu >=  3.6"
else
        echo ">=  3.6"
fi

输出

bogon:Desktop macname$ ./test.sh 
0
bu >=  3.6

test.sh

#!/bin/sh
zero=0
x=`python3 a.py`
y="3.6"
status=`echo "$x >= $y" | bc`
echo $status

if [[ $status -eq $zero ]];then
        echo "bu >=  3.6"
else
        echo ">=  3.6"
fi

输出

bogon:Desktop macname$ ./test.sh 
1
>=  3.6

参考：

http://ju.outofmemory.cn/entry/62675
https://zhidao.baidu.com/question/391954555815798765.html
https://www.cnblogs.com/kaishirenshi/p/9729800.html
https://www.cnblogs.com/joyer/p/3199630.html