# RQ$1$

$"""$

Write a function day$\_$name that converts an integer number $0$ to $6$ into the name of a day. Assume day $0$ is 'Sunday'.

Your function should return error message if the arguments to the function are not valid.

$"""$

def day$\_$name$($n$)$:

$"""$

$>>>$ day$\_$name$(3)$

'Wednesday'

$>>>$ day$\_$name$(6)$

'Saturday'

$>>>$ day$\_$name$(42)$

'Invalid argument'

$"""$

$"***$ YOUR CODE HERE $***"$