provide the python code for the following code Step $6.$ Use Keyword$-$Only Parameters:

Write a function named calculate$\_$area that takes three parameters:

length $($int$),$ width $($int$),$ and unit $($keyword$-$only, default$=$meters$).$

Ensure the unit parameter can only be passed as a keyword argument. Call the function with and without the

unit argument. $($you will get and error here$)$

$$ Call the header$\_$caller function with input $6$

$$ Call the function with inputs $5,10$

$$ Call the function with inputs $5,10,$ unit $=$feet$$

$$ Call the function with inputs $5,10,$feet$$ error here