Changing one list unexpectedly changes another, too [duplicate]

Answer 1

you could use

vec=v[:] #but

"Alex Martelli's opinion (at least back in 2007) about this is, that it is a weird syntax and it does not make sense to use it ever. ;) (In his opinion, the next one is more readable)."

vec=list(v)

I mean it was Erez's link... "How to clone or copy a list in Python?"