Python Challenge - Maximize Stock Trading Profit

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def max_profit_days(stock_prices): max_profit_amt = 0 max_day_1 = 0 max_day_2 = 1 for day in stock_prices: i = stock_prices.index(day) while i < len(stock_prices): if stock_prices[i] - day > max_profit_amt and i != stock_prices.index(day): max_day_1 = stock_prices.index(day) max_day_2 = i max_profit_amt = stock_prices[i] - day i+=1 return max_day_1, max_day_2
def max_profit_days(stock_prices): # Write your code here: max_profit = None for i in range(len(stock_prices)): for j in range(i + 1, len(stock_prices)): profit = stock_prices[j] - stock_prices[i] if max_profit is None or profit > max_profit: max_profit = profit buy_day, sell_day = i, j return (buy_day, sell_day) print(max_profit_days([17, 11, 60, 25, 150, 75, 31, 120]))

def max_profit_days(stock_prices):

Write your code here:

high = -999999
final = [0,0]

for i in range(len(stock_prices)):

for j in range(i + 1,len(stock_prices)):
  if stock_prices[j] - stock_prices[i] >= high:
    high = stock_prices[j] - stock_prices[i]
    final = (i,j)


return final

print(max_profit_days([17, 11, 60, 25, 150, 75, 31, 120]))

I made a helper function to find the index of the maximum (only using the part of the list from a specified index forward),
and I used that in a loop to get the max possible profit for buying on any given day,
and then finding the maximum out of all of those.

my code
def index_of_max(arr, starting_index = 0, ending_index = None):
    length = len(arr)
    if length < 1:
      return None
    if ending_index is None:
      ending_index = length - 1
      length = ending_index + 1
    max_so_far = arr[starting_index]
    max_index = starting_index
    for i in range(starting_index, length):
      if arr[i] > max_so_far:
        max_so_far = arr[i]
        max_index = i
    return max_index

def max_profit_days(stock_prices):

  length = len(stock_prices)
  profits = []
  sell_days = []

  for i in range(length - 1):
    # index i is the day that buy the stock
    differences = [(x - stock_prices[i]) for x in stock_prices]
    best_day = index_of_max(differences, starting_index = i + 1)
    profit = differences[best_day]
    #print((i, best_day), profit)
  selected_index = index_of_max(profits)
  return (selected_index, sell_days[selected_index])

def max_profit_days(days):
for buy_day in days:
for sell_day_index in range(bday_index,length):
if highest_profit==None or highest_profit<profit:
return (b_day,s_day)

print(max_profit_days([17, 11, 60, 25, 150, 75, 31, 120]))