给我写一个季节性碳交易的代码

季节性碳交易通常涉及到气候模型、排放数据管理和市场机制。以下是一个简单的Python示例，展示了一个基本的季节性碳信用交易的概念，这个例子假设我们有一个简单的市场和一个按季度分配的碳配额系统：

class CarbonCreditMarket:
    def __init__(self):
        self.quarterly_emissions = {}
        self.credits_per_quarter = [0, 0, 0, 0]  # 初始每个季度的配额

    def assign_credits(self, emitters, quarterly_distribution):
        for emitter in emitters:
            self.quarterly_emissions[emitter] = {q: emitters[emitter].get_emissions_for_qtr(q) for q in quarterly_distribution}

    def trade_credits(self, seller, buyer, quantity):
        if self.has_sufficient_credits(seller, quantity) and self.can_afford_credits(buyer, quantity):
            self.quarterly_emissions[seller][buyer.current_quarter] -= quantity
            self.quarterly_emissions[buyer][seller.current_quarter] += quantity
            return True
        else:
            return False

    def has_sufficient_credits(self, entity, required_quantity):
        return sum(self.quarterly_emissions[entity].values()) >= required_quantity

    def can_afford_credits(self, entity, price):
        entity_balance = sum(self.quarterly_emissions[entity].values())
        return entity_balance * price >= entity.get_money_to_pay(price)

# 示例中的实体类
class Emitter:
    def __init__(self, name):
        self.name = name
        self.emissions_data = ...  # 获取实际排放数据的方法
        self.current_quarter = None

# 使用示例
market = CarbonCreditMarket()
emitters = {'CompanyA': Emitter('Company A'), 'CompanyB': Emitter('Company B')}
market.assign_credits(emitters, ['Q1', 'Q2', 'Q3', 'Q4'])
# 假设交易条件
seller = emitters['CompanyA']
buyer = emitters['CompanyB']
price_per_credit = 5  # 单价单位可能是元或其他货币
quantity = 1000
if market.trade_credits(seller, buyer, quantity):
    print(f"{seller.name} sold {quantity} credits to {buyer.name} at ${price_per_credit}")
else:
    print("Trade not possible due to insufficient credits or affordability.")