Designated pip downloaded to Python2 in command;
1 sudo python2 -m pip install XXX
Designated pip downloaded to Python3 in command;
1 sudo python3 -m pip install XXX
Designated pip downloaded to Python2 in command;
1 sudo python2 -m pip install XXX
Designated pip downloaded to Python3 in command;
1 sudo python3 -m pip install XXX