weapon creation

[haye]

Hello, I have to create a " weapon " with name, damage speed, range, damage/second, and the damage would change if the weapon has a gem..
here is the starter code i have:

class Weapon(object):
[...]

class Sword(Weapon):
    def __init__(self, name='sword', speed=1, dmg_min=1, dmg_max=1, wrange=1, gems=, gems_nb=0):
        super(Sword, self).__init__(speed=speed, dmg_min=dmg_min, dmg_max=dmg_max, wrange=wrange)
        self.gems = gems
        self.gems_nb = gems_nb
        self.name = name
        return

class Gem(object):
[...]

    def infos(self):
        print "Name = {}".format(self.name)
        print "Damage range = {}".format()
        print "Dps = {}".format()
        print "Nb gems = {}".format()
        print "Golden gem: {}".format()

excalibur = Sword('Excalibur', 10, 50, 120, 4)
gold_gem = Gem("Golden gem", 100)
excalibur.add_gem(gold_gem)
excalibur.infos()

It has to print :

Output:
Name = Excalibur
Dammage range = 50-120
Dps = 1850
Nb gems = 1
Golden gem:
   +100 dmg, +0 speed, +0 range.

im stuck, any help ?
thanks!