What is output?

$m{y}_{v}ar=[\text{'}python\text{'}]$

$m{y}_l$ist $=m{y}_{v}ar[0].$split$()$

$m{y}_l$ist $+=$ 'world'

del $m{y}_l$ist$[1]$

print$(m{y}_l$ist$)$

$[\text{'}$python$\text{'},\text{'}$o$\text{'},\text{'}$r$\text{'},$ I,$\text{'}\text{'}$d$\text{'}]$

$[\text{'}$p$\text{'},\text{'}$t$\text{'},\text{'}$h$\text{'},\text{'}$o$\text{'},$ n$\text{'},\text{'}$w$\text{'},\text{'}$o$\text{'},$ r$\text{'},$ I; $\text{'}$d$\text{'}]$

$[\text{'}$python$\text{'},$ 'orld'$]$

$[\text{'}$python$\text{'}]$