这个函数的目标是计算股票的买入和卖出。由于某种原因transaction.split方法返回错误。错误是说这个方法需要3个参数，我有。在这方面的任何帮助是非常感谢！

from collections import deque

def calculate_gain(stock_transactions):
    gain = 0
    shares_bought = deque()

    for transaction in stock_transactions:
        action, num_shares, share_price = transaction.split()
        num_shares = int(num_shares)
        share_price = int(share_price)

        if action == 'buy':
            shares_bought.append((num_shares, share_price))
        else:
            shares_sold = num_shares

    while shares_sold > 0:
        shares = shares_bought.popleft()
        if shares[0] > shares_sold:
            gain += shares_sold * (share_price - shares[1])
            shares[0] -= shares_sold
            shares_bought.appendleft(shares)
            shares_sold = 0
        else:
            gain += shares[0] * (share_price - shares[1])
            shares_sold -= shares[0]

    return gain

    stock_transactions = [
    "buy 100 shares at 20 each",
    "buy 20 shares at 24 each",
    "buy 200 shares at 36 each",
    "sell 150 shares at 30 each"
    ]

    total_gain = calculate_gain(stock_transactions)
    print(f"The total capital gain is ${total_gain}")

我试着改变参数的名称、间距和缩进。它仍然没有正确拆分。
Error Image