Find the center of a 2D polygon or line with the coordinates of it's vertices

FindCenter.py

verts = 0
def getInput():
    """ Gets the number of vertices from the user """
    global verts
    print "How many vertices?"
    verts = input()
    listInputs(verts)

def listInputs(vertices):
    """ Finds out the x and y coords of the vertices together """
    
    # Initiate coords lists
    xcoords = []
    ycoords = []
    
    for x in range(0, vertices):
        # Loop through each vertex to get the x coord.
        print  'Please enter %(number)d x coord.' % {"number": x + 1}
        xcoord = input()
        xcoords.append(xcoord)
    print xcoords # FDB

    for y in range(0, vertices):
        # Loop through each vertex to get the y coord
        print  'Please enter %(number)d y coord.' % {"number": y + 1}
        ycoord = input()
        ycoords.append(ycoord)
    print ycoords # FDB
    addInputs(xcoords, ycoords)
    
def addInputs(coordsx, coordsy):
    """ Adds x coords and y coords by looping through lists"""
    xsum = 0
    ysum = 0
    # Initiate sum variables
    for x in range(0, len(coordsx)):
        xsum += coordsx[x]
    print xsum # For Debug
    for y in range(0, len(coordsy)):
        ysum += coordsy[y]
    print ysum # For Debug

    divInputs(xsum, ysum)

def divInputs(sumx, sumy):
    """ Divides the sums of the coordinates by the number of vertices

    and displays them. """
    global verts
    
    divx = sumx / verts
    divy = sumy / verts

    print 'The location of the center is %(xdiv)d , %(ydiv)d'% {"xdiv": divx, "ydiv": divy}


if __name__ == "__main__":
    getInput()