Easy and simple table printer for python

table.py

class Table:
    """
        Simple terminal table printer:

               | col1  | col2  | col3  |
        -------+-------+-------+-------+
         row1  | 1     | 2     | 3     |
        -------+-------+-------+-------+
         row2  | 4     | 5     | 6     |
        -------+-------+-------+-------+
    """

    def __init__(self, rows, cols, data):
        """
            Calculates sizes from the MAX length of all the cells, 
            not col by col.
            You prefer that? Make changes and request a merge :D
        """
        self.cols = cols
        self.rows = rows
        self.data = []

        # TODO Check if sizes match

        all_fields = []
        all_fields += cols
        all_fields += rows
        for d in data:
            strd = map( lambda x: str(x), d)
            self.data.append(strd)
            all_fields += strd
        ws = map( lambda x: len(x), all_fields )
        self.width = max( ws ) + 2

    def __str__(self):
        table = self.fill_field('') + '|'
        for c in self.cols:
            table += self.fill_field(c) + '|'
        table += '\n'
        table += self.hr()

        for r, dr in zip(self.rows, self.data):
            table += self.fill_field(r) + '|'
            for d in dr:
                table += self.fill_field(d) + '|'
            table += '\n'
            table += self.hr()
        return table

    def fill_field (self, field, char=' '):
        result = char
        for nchar in range(0,self.width):
            if len(field) > len(result) -1 :
                result += field[nchar]
            else:
                result += char
        return result

    def hr (self):
        hr = ''
        for col in range(len(self.cols)+1):
            hr += self.fill_field('', '-') + '+'
        return hr+'\n'


if __name__ == '__main__':
    rows = ['row1','row2']
    cols = ['col1','col2','col3']
    data = [
        [ 1,2,3 ],
        [ 4,5,6 ],
    ]
    table = Table( rows, cols, data )
    print table
    """ RESULT:

           | col1  | col2  | col3  |
    -------+-------+-------+-------+
     row1  | 1     | 2     | 3     |
    -------+-------+-------+-------+
     row2  | 4     | 5     | 6     |
    -------+-------+-------+-------+
    """