booze_bot.py

budget = 100
names = ["A", "B", "Best", "Pricey"]
prices = [100, 10, 1, 101]
volumes = [10, 1, 0.1, 100] # litres
abvs = [1, 10, 100, 100] # %

for i, p in enumerate(prices) :
    if p > budget: 
        del names[i]    
        del prices[i]
        del volumes[i]
        del abvs[i]

units = [ v * p for v,p in zip(volumes, abvs) ]
bangforbuck = [ u / p for u,p in  zip(units, prices)]
i = max(zip(bangforbuck, range(len(bangforbuck))))[1]

print(names[i])
print("Units per €:", bangforbuck[i], "units")