ERROR Could not find a version that satisfies the requirement pip3 【解决办法】

今天爱分享给大家带来ERROR Could not find a version that satisfies the requirement pip3 【解决办法】，希望能够帮助到大家。
因为python默认升级pip的命令是：pip install –upgrade pip，那python3应该如何升级呢（尤其是当系统中同时含有python2.7和python3的时候）
错误命令1：

pip3 install --upgrade pip

错误命令2：

pip3 install --upgrade pip3

报错：
ERROR Could not find a version that satisfies the requirement pip3
ERROR No matching distribution found for pip3

正确命令：
1509

python3 -m pip install --upgrade pip