what does x reprsent in this code ?

[astral_travel]

i'm running linux ubuntu,
on my system is installed both python 2.7 and python 3.5

is it safe to uninstall python 2.7 without disabling or damaging in any way the 3.5 version ?

for example, if i check out the PIP version, it tells me it's 20.0 something, but it also tells me it runs on python 2.7 and that this version is out of date,

the question is if i uninstall python 2 will it disable the packages running under it.. ?