import json
import collections


def get_weights(controls, joints):
    distribution = len(joints) / (len(controls) - 1)

    weights = collections.OrderedDict()

    for cidx, ctrl in enumerate(controls):
        offset = cidx * distribution
        weights.setdefault(ctrl, collections.OrderedDict())
        for jidx, jnt in enumerate(joints):
            weight = (abs(jidx - offset) - distribution) / distribution
            weight = abs(weight) if weight <= 0 else 0.0

            weights[ctrl][jnt] = weight

    return weights


joints = ['joint{}'.format(x + 1) for x in range(6)]
controls = ['ctrl{}'.format(x + 1) for x in range(3)]


print(joints)
print(controls)

weigts = get_weights(controls=controls, joints=joints)

# No se puede hacer pretty print de un diccionario ordenado
print(json.dumps(weigts, indent=4))