如何迭代目录中文本文件的内容，并在python中进行特定的计算？

在这里，listOfLines将以列表项的形式显示内容，但我不知道下一步要做什么？

试试这个。代码注释中的解释：

path=input("Enter the file name:")
listOfLines = list()
with open (path, "r") as myfile:
    for line in myfile:
        listOfLines.append(line.strip())

输出：

path=input("Enter the file name:")

# declare variables
lst_item = []
lst_price = []
discount = 0

# open file and load lines into a list
# strip() all items in the list to remove new lines and extra spaces
with open (path, "r") as myfile:
    lines = [line.strip() for line in myfile.readlines()]
# loop through the lines
for line in lines:
    # if the line is not empty and doesn't include blank line
    if line and "blank line in b/w" not in line:
        # split the line by SPACE " "
        split_line = line.split(" ")
        # join all the items of the list except the last one
        # to convert a word like Ice Cream back to one string
        # set them as the item
        item = " ".join(split_line[:-1])
        # set the price as the last item of the list
        price = split_line[-1]
        # if the price is free set it to 0
        if price == "Free":
            price = 0
        # If Discount is in the item string, set the discount variable
        if "Discount" in item:
            discount = int(price)
        # Else add item and price to lst_item and lst_price
        else:
            lst_item.append(item)
            lst_price.append(int(price))
        print (item, price)
# sum all prices in lst price
subtotal = sum(lst_price)
# minus discount
after_discount = subtotal - discount
total = after_discount

print ("Subtotal:", subtotal, "Disount:", discount, "Total:", total)

但我不知道下一步该怎么办？这不是我们真正可以帮助的事情。请看。另一方面，变量和函数名应遵循带有下划线的

小写形式，除非有充分理由不这样做。
path=input("Enter the file name:")

# declare variables
lst_item = []
lst_price = []
discount = 0

# open file and load lines into a list
# strip() all items in the list to remove new lines and extra spaces
with open (path, "r") as myfile:
    lines = [line.strip() for line in myfile.readlines()]
# loop through the lines
for line in lines:
    # if the line is not empty and doesn't include blank line
    if line and "blank line in b/w" not in line:
        # split the line by SPACE " "
        split_line = line.split(" ")
        # join all the items of the list except the last one
        # to convert a word like Ice Cream back to one string
        # set them as the item
        item = " ".join(split_line[:-1])
        # set the price as the last item of the list
        price = split_line[-1]
        # if the price is free set it to 0
        if price == "Free":
            price = 0
        # If Discount is in the item string, set the discount variable
        if "Discount" in item:
            discount = int(price)
        # Else add item and price to lst_item and lst_price
        else:
            lst_item.append(item)
            lst_price.append(int(price))
        print (item, price)
# sum all prices in lst price
subtotal = sum(lst_price)
# minus discount
after_discount = subtotal - discount
total = after_discount

print ("Subtotal:", subtotal, "Disount:", discount, "Total:", total)

Enter the file name:in.txt
Chocolate 50
Biscuit 35
Ice cream 50
Rice 100
Chicken 250
Perfume 0
Soup 0
Discount 80
Subtotal: 485 Disount: 80 Total: 405