loss_aversion.py

import tejapi
import matplotlib.pyplot as plt
tejapi.ApiConfig.api_key = "your api key"
tejapi.ApiConfig.ignoretz = True

# Select 2739 recent stock prices
company = '2739'
price_data = tejapi.get('TWN/EWPRCD', 
                coid = company,
                mdate={
                    # start date    
                    'gte':'2023-06-12', 
                    # end date
                    'lte':'2023-07-12'}, 
                opts={'columns': ['coid','mdate','close_d']}, 
                paginate=True
            )
print(price_data)

date = []
for d in price_data['mdate']:
    date.append(str(d)[5:7]+'/'+str(d)[8:10])

    
plt.figure(figsize=(11, 6))
plt.plot(date, price_data['close_d'], label='stock price', color='blue') 
plt.title('stock price')  # set figure title
plt.xlabel('Days')  # set X-axis label
plt.ylabel('price')  # Set Y-axis label
plt.show()

get_day1_price = price_data['close_d'][0]
print('purchase price:',get_day1_price)
no_strategy = 0
if_strategy = 0


for i in range(0, len(price_data['close_d'])):
  no_strategy = no_strategy + price_data['close_d'][i]-get_day1_price
  
  # If the price decrease more than 10 percent of original price , it will be sold.
  if price_data['close_d'][i] < get_day1_price*0.9:
    if_strategy += 0
  else:
    if_strategy = if_strategy + price_data['close_d'][i]-get_day1_price


print('No-loss-avoidance operation settlement surplus:',no_strategy)
print('circumvention operation to settle the surplus:',if_strategy)