Task

Finish implementing a final function, pretty$\_$pascal$\_$triangle, started below for you

The function again takes a single parameter $n$ that gives the depth of the triangle

It will return $($but not print$)$ a string representation of a pascal triangle that is centered about the bottom row.

Numbers in each row should have one space between each. Each row should be centered and have the same width,

which will necessarily be the width of the bottom row.

Save the resulting string in the variable called tri$\_$string, which is what is returned.

Sample output:

print$($pretty$\_$pascal$\_$triangle$(2))$

should produce

$1$

$11$

$121$

Test your result by calling print$($pretty$\_$pascal$\_$triangle$($ n $))$ for various values of n $,$ as shown above.

Notes and Hints

There are several ways you could go about this, but here's one path:

Produce the data for the triangle using pascal$\_$triangle$(n)$

Convert each row of the triangle to a list of strings using the $)$ function on each element

Use the join$()$ method of strings to convert each row$/$list into a single string of numbers separated by single

spaces

Find the width of the bottom row

Use the center$()$ method of strings to center each row to the right width

Again ust the join$()$ method to combine all the rows together so they are separated by newline characters

In $[]$: v def pretty$\_$pascal$\_$triangle$($n$)$:

Create a nicely$-$formatted Pascal's triangle to a specified depth.

Parametersn$\}$:$\backslash$mathrm$\{$ int

how many rows to print, must be greater than or equal to $1$

Returnsstr

nicely formatted string representation of the triangle

$"""$

tri$\_$string $=\text{'}\text{'}$raise NotImplementedError$()$

return tri$\_$string