How to install python3-pip, under Ubuntu how to use the python3? that comes with the system

there is a python3 by default on the machine, but when you install pip3, you install another python3, because you only write scripts in python, so you don"t need extra python,. How can you avoid this problem again?
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Python3.x python ubuntu
Mar.11,2021

use the virtual environment virtualenv.

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e43e05-44a6b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e43e05-44a6b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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