pip not working in Python 3.6.5

[nylanman]

Hello,
I just install 3.6.5 and tried to install Flask, but pip or pip3 does not work.
I tried:
>>> pip install flask
File "<stdin>", line 1
pip install flask
^
SyntaxError: invalid syntax
I am a noob, but I was able to do this in an earlier version. I installed 3.6.5 on 2 PCs and received the same response.

Does anyone have a suggestion?
I appreciate it!
Thank you,
Matt

[snippsat]

You shall do it from cmd(Windows) | Terminal(Linux),not interactive shell(which has >>>).