Hypersonic | Python Fiddle

class Entity:
    def __init__(self, e):
        self.entity_type = e[0]
        self.owner = e[1]
        self.x = e[2]
        self.y = e[3]
        self.param_1 = e[4]
        self.param_2 = e[5]
        
class Field:
    def __init__(self, width, height):
        self.w = width
        self.h = height
        self.m = [['x' for i in xrange(self.w)] for i in xrange(self.h)]
        
    def __str__(self):
        for row in range(len(self.m)):
            print self.m[row]
        return "done"
        
    def copy_row(self, row, num):
        if num >= self.h:
            print >> sys.stderr, "ERROR Field:copy_row num too big"
        elif len(row) != self.w:
            print >> sys.stderr, "ERROR Field:copy_row row size not matching"
        else:
        	self.m[num] = list(row)[:]
        
    def num_of_boxes(self):
        x = 0
        for line in range(self.h):
            x = x + self.m[line].count(0)
        return x

#TEST CODE
r1 = ['.', 0, '.', 0]

x = Field(3, 4)
print x.m
x.copy_row(r1, 2)
print x.m

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