I have run the first one but it showing this:
apt 2.0.9 (amd64)
Usage: apt [options] command
apt is a commandline package manager and provides commands for
searching and managing as well as querying information about packages.
It provides the same functionality as the specialized APT tools,
like apt-get and apt-cache, but enables options more suitable for
interactive use by default.
Most used commands:
list - list packages based on package names
search - search in package descriptions
show - show package details
install - install packages
reinstall - reinstall packages
remove - remove packages
autoremove - Remove automatically all unused packages
update - update list of available packages
upgrade - upgrade the system by installing/upgrading packages
full-upgrade - upgrade the system by removing/installing/upgrading packages
edit-sources - edit the source information file
satisfy - satisfy dependency strings
See apt(8) for more information about the available commands.
Configuration options and syntax is detailed in apt.conf(5).
Information about how to configure sources can be found in sources.list(5).
Package and version choices can be expressed via apt_preferences(5).
Security details are available in apt-secure(8).
This APT has Super Cow Powers.
It appears to have become a catch-22. You need Python proper in order to configure - but need it configured in order to properly install python. @337harvey has some experience in this. Perhaps he can help.
To see if Python3 is on your system, you can use python3 --version. This will only respond if installed and will provide the version installed. I don't believe you removed Python since a lot of the OS depends on python3. You may have been using the python command, which was utilized for python2. Python 2 was removed from use in ubuntu based distros back in august or september last year.
Try your commands with python3 in the front instead of python. You can check what version of pip is installed with pip3 --version. It may prompt you to upgrade if it's below version 23 (it will also provide the command to upgrade pip).