如何在文件中查找单词或行并将其下的行替换为新单词？

Question

如果这看起来很无聊，我深表歉意，但我无法准确找到我想要做的事情。我制作了一个用于投标工作的程序，我想使用一个文本文件作为配置文件来存储定价等，程序可以根据需要对其进行读写。这是我所拥有的基本知识。

::示例代码::

def job():
    question1 = input("Do you want to adjust your pricing? ").lower()
    if question1 == "y" or question1 == "yes":
        question2 = input("\nWhat price point would you like to change?\nFlooring cost(1), Basic repair cost(2), or Fuel mileage cost(3): ")
        if question2 == "1":
            flooring_cost = input("\nWhat is your charge per sqft for flooring? ")
            with open("JobFiles.txt", "r") as fo, open("JobFiles.txt", "a") as fw:
                for line in fo:
                    if line == "Floor Price":
                        next(fo)
                        fw.write(flooring_cost + "\n")
                fo.close()
                fw.close()
            return job()

:: 示例 JobFiles.txt::

Flooring Price
2.50    <----------<<
Basic Repair Price
25
Fuel Charge
0.40

::预期文件示例::

Flooring Price
2.75    <----------<<
Basic Repair Price
25
Fuel Charge
0.40

所以它应该读取文件“JobFiles.txt”并将“Flooring Price”下的行替换为用户输入。我可以让它什么都不做或擦除文件，但不是我想要的。

编辑：它应该在文本文件中搜索一个词，即“Flooring Price”并替换它下面的行，这样文件就可以增长和更改，而无需重新编码来调整“Flooring Price”是否打开第 1 行或第 100 行。

Answer 1

经过将近一周和 3357 行代码的编写，我已经完成了我的程序！所以这里是如何做我想弄清楚的，在文件中搜索一行并替换它下面的行。

::查找信息::

with open("test_folder/test", "r") as fo:#<---<< opens the file in read mode
    data = fo.readlines()#<---<< saves the file to a list variable
for i, line enumerate(data):#<---<< gets the line numbers
    if "key word" in line:#<---<< searches for key word
        n = i + 1#<---<< takes the line number from the key word and adds one aka moves down one line
        var = data[n].strip()#<---<< adds line from file to a variable and removes the /n

::换文件::

 with open("test_folder/test", "r") as fo:  #<---<<
    data = fo.readlines()                   #<---<<
for i, line enumerate(data):                #<---<<
    if "key word" in line:                  #<---<<
        n = i + 1                           #<---<<
data[n] = "%s\n" % (var2)#<---<< changes the value on the line in the list
with open("test_folder/test", "w") as fw:#<---<< opens file in write mode
    fw.writelines(data)<---<< writes the altered list back to file

我希望这很清楚并且可以帮助其他人。总是有更好的方法来做事，所以如果你有任何方法，请纠正我或补充。

Answer 2

你可以这样做。

def job(value):
    question1 = input("Do you want to adjust your pricing? ")
    question1 = question1.lower()
    if question1[0] == "y" or question1 == "yes":
        question2 = input("\nWhat price point would you like to change?\nFlooring cost(1),"
                          "Basic repair cost(2), or Fuel mileage cost(3): ")
        if question2 == "1":
            flooring_cost = input("\nWhat is your charge per sqft for flooring? ")
            value[0] = flooring_cost
    return value

filename = "JobFiles.txt"
f = open(filename, 'r')
key = []
value = []
while True:
    line1 = f.readline().rstrip() # reading odd no. line
    line2 = f.readline().rstrip() # reading even no. line
    if not line2:
        break
    else:
        key.append(line1) # every odd no. line is the key, ex. Flooring Price
        value.append(line2) # every even no. line is the value, ex. 2.50
f.close()

value = job(value)
fo = open(filename, 'w')
for key, value in zip(key, value):
    fo.write(key + '\n' + value + '\n') # writing pairs of line in file
fo.close()