类型错误：当列表传递给函数时，列表索引必须是整数或切片，而不是元组

Question

我正在研究返回有关数组的信息，抱歉列表我习惯于 Java，但每次运行它时，结果都会出现错误

if low_stock > stock_prices[time]:

>>> TypeError: list indices must be integers or slices, not tuple

def get_max_profit(stock_prices  = [], *args):

    low_stock = stock_prices[0]
    low_time = 0
    high_stock = stock_prices[1]
    high_time = 0
    profit = high_stock - low_stock

    for time in enumerate(stock_prices):
        if low_stock > stock_prices[time]:
            low_stock = stock_prices[time]
            low_time = time 
        while time > 0:
            if high_stock < stock_prices[time]:
                high_stock = stock_prices[time]
                high_time = time
        if low_time < high_time:
             return profit
        else:
            return 'Negative Balance'

请帮忙...

Answer 1

您的代码中有许多逻辑错误和运行时错误。 最好的策略是将价格列表转换为 NumPy 数组。 NumPy 有一些非常方便的函数来解决你的问题：

import numpy as np
stock_prices = np.array(stock_prices)

def get_max_profit(stock_prices):        
    high_time = stock_prices.argmax()
    low_time = stock_prices.argmin()
    if low_time < high_time:
        return stock_prices.max() - stock_prices.min()
    else:
        return 'Negative Balance'

最后一行实际上也很糟糕，因为函数应该始终返回相同类型的值。 您可能想用 -1 替换'Negative Balance' ，稍后再进行整理。