def mystrlen(s):
        return max(len(line) for line in str(s).split('\n'))

def autodetectWidth(data):
    widths = [0]*len(data[0])
    for line in data:
        for i in range(len(line)):
            widths[i] = max(widths[i], mystrlen(line[i]))
    return widths

# use: myTable.set_cols_width(autodetectWidth(list_of_rows))
# requires an additional iteration over the data, so won't work with generators etc, use list()