Python List/Tupule : Hi i want to modify my list so it shows an '(x)' at the given coordinate via tupule.

Here is my code so far

    #w=width
    #h=height
    #c=coordinates

    new_grid = []
    def coordiantes(w,h,c):
    '''    
    >>> coordiantes(2, 4, (0, 1))
    >>> print(new_grid)
    [['(_)', '(x)'], ['(_)','(_)'], ['(_)', '(_)'], ['(_)', '(_)']]
    '''
    b=[]
    for i in range(h):
        grid.append(b)
    for  j in range(w):
        c=('(_)')
        b.append(c)

i am not sure how to implement '(x)' at the given coordinates, any help is appreciated
thanks       
    
