Python初学者，在将代码添加用文件打开的功能时卡住了

Question

Python初学者，在将代码添加用文件打开的功能时卡住了

"""
  Update your program so that it prints (writes) the output to a file.
How do we do this?
• First you need to open the file for writing. You only need to do this once, so add this line before
your loop starts:
out_file = open(OUTPUT_FILE, 'w')
Note that this code line expects you to define the constant OUTPUT_FILE, so do that above.
• Update any print statements, so they output to the file.
Here’s an (incomplete) example:
print("${:,.2f}".format(price), file=out_file)
• Close the file at the very end:
out_file.close()
• This version uses the .format() method when printing the price. Change this to use f-string
formatting (keet the same output).
"""
import random

MAX_INCREASE = 0.1  # 10%
MAX_DECREASE = 0.05  # 5%
MIN_PRICE = 0.01
MAX_PRICE = 1000.0
INITIAL_PRICE = 10.0
day = 1
print("On day {} price is:".format(day),end="")

price = INITIAL_PRICE
print("${:,.2f}".format(price))

while price >= MIN_PRICE and price <= MAX_PRICE:
    price_change = 0
    # generate a random integer of 1 or 2
    # if it's 1, the price increases, otherwise it decreases
    if random.randint(1, 2) == 1:
        # generate a random floating-point number
        # between 0 and MAX_INCREASE
        price_change = random.uniform(0, MAX_INCREASE)
        day+=1
        print("On day {} price is:".format(day), end="")
    else:
        # generate a random floating-point number
        # between negative MAX_DECREASE and 0
        price_change = random.uniform(-MAX_DECREASE, 0)
        day+=1
        print("On day {} price is:".format(day), end="")

    price *= (1 + price_change)
    print("${:,.2f}".format(price))

上面代码顶部是给的实现用文件打开功能要求，在这部分我卡住了，麻烦看一下，给一个修改后的代码，如果有注释就更好啦，谢谢

Answer 1

请参考，运行后会生成文件tmp.txt，内容如下：

import random

OUTPUT_FILE = 'tmp.txt'  # 定义文件名，可根据需求更改，这里定义文件名为 tmp.txt
out_file = open(OUTPUT_FILE, 'w')  # 打开文件

MAX_INCREASE = 0.1  # 10%
MAX_DECREASE = 0.05  # 5%
MIN_PRICE = 0.01
MAX_PRICE = 1000.0
INITIAL_PRICE = 10.0
day = 1

# f-string格式化打印内容参考：https://blog.csdn.net/wuli_xin/article/details/117979698
# print()函数中增加 file = out_file表示把该行语句输出到文件中，下面的print语句中均加入file = out_file
print(f"On day {day} price is:", end="",file=out_file)
price = INITIAL_PRICE

print(f"${price:.2f}",file=out_file)

while price >= MIN_PRICE and price <= MAX_PRICE:
    price_change = 0
    # generate a random integer of 1 or 2
    # if it's 1, the price increases, otherwise it decreases
    if random.randint(1, 2) == 1:
        # generate a random floating-point number
        # between 0 and MAX_INCREASE
        price_change = random.uniform(0, MAX_INCREASE)
        day += 1
        print(f"On day {day} price is:", end="",file=out_file)
    else:
        # generate a random floating-point number
        # between negative MAX_DECREASE and 0
        price_change = random.uniform(-MAX_DECREASE, 0)
        day += 1
        print(f"On day {day} price is:", end="",file=out_file)
    price *= (1 + price_change)
    print(f"${price:.2f}",file=out_file)

out_file.close()  # 关闭文件