What is the purpose of np$.$array in the below code?

$a=[6\mathrm{.}1,5\mathrm{.}8,5\mathrm{.}97,5\mathrm{.}43,7\mathrm{.}34,8\mathrm{.}67,6\mathrm{.}55,3\mathrm{.}66,2\mathrm{.}31,6\mathrm{.}84]$

$b=[2\mathrm{.}5,3\mathrm{.}19,2\mathrm{.}26,3\mathrm{.}17,8\mathrm{.}17,2\mathrm{.}76,5\mathrm{.}22,9\mathrm{.}82,3\mathrm{.}95,8\mathrm{.}38]$

$n{p}_a=np.$array$(a)$

$n{p}_b=np.$array$(b)$

To measure the length of two lists

To move data from $\text{'}$a$\text{'}$ to $\text{'}$b$\text{'}$

Convert the lists $\text{'}a\text{'}$ and $\text{'}b\text{'}$ to a NumPy array

to change the code from wide to long