weight_calc.py

barbell_weight = 45
# weight_selection = [45, 35, 25, 10, 5, 5, 2.5]
weight_selection = [55, 45, 35, 25, 15, 15, 10, 5, 2.5]
max_possible_weight = int(sum(weight_selection) * 2 + barbell_weight)

class ImpossibleWeight(Exception):
    def __init__(self, weight):
        self.weight = weight

def calculate_weights(desired_weight):
    if desired_weight < barbell_weight:
        raise Exception(f"desired weight must be equal to or greater than barbell: {barbell_weight}")
    
    if desired_weight > max_possible_weight:
        raise Exception(f"{desired_weight} greater than computable max")

    if desired_weight % 5 != 0:
        raise Exception("Value must be multiple of 5")

    needed_weights = []
    remaining_weight = (desired_weight - barbell_weight) / 2.0

    for weight in weight_selection:
        if weight <= remaining_weight:
            needed_weights.append(weight)
            remaining_weight -= weight

    if remaining_weight != 0:
        raise ImpossibleWeight(desired_weight)

    return needed_weights

for w in range(barbell_weight, max_possible_weight+5, 5):
    try:   
        print(f'"{w}","{", ".join([str(i) for i in calculate_weights(w)])}"')
    except ImpossibleWeight:
        pass