def create$\_$mapping$($squares: list$[$list$[$Square$]])->\backslash$

dict$[$tuple$[$int$,$ int$],$ list$[$Line$]]$:

$"""$

Return a mapping from coordinate to the list of lines which cross

that coordinate, for the given $.$

Note: is oriented in terms of rows, so squares$[$r$][$c$]$ gives you the

Square at coordinate $($r$,$ c$).$

The Line objects in the lists in the returned mapping are ordered by:

horizontal line, then vertical line, then down$-$diagonal $($if it exists$),$

and then up$-$diagonal $($if it exists$).$

Hint: Your implementation of this function must rely on at least

two of the defined helpers.

Preconditions:

$-$ len$($squares$)>0$

$-$ every sublist has length equal to the length of

$-$ is oriented in terms of rows, so squares$[$r$][$c$]$ gives you the

Square at coordinate $($r$,$ c$).$

$>>>$ squares $=$ create$\_$squares$(6)$

$>>>$ mapping $=$ create$\_$mapping$($squares$)$

$>>>$ lines $=$ mapping$[(2,0)]$

$>>>$ len$($lines$)$

$3$

$>>>$ is$\_$row$($lines$[0].$cells$)$

True

$>>>$ is$\_$column$($lines$[1].$cells$)$

True

$>>>$ is$\_$diagonal$($lines$[2].$cells$)$

True

$"""$Please code in python