如何使用 Python 替換文件中的文本

Question

我想讀取一個包含多行切換命令的大文件，然后啟動一個包含相同文本命令列表的新文本文件，但只用所需的新文本替換幾個字符或幾行文本。

我還想有條件，這意味着如果存在一個指定的文本行，那么我希望將所需的文本替換為新文件中的位置。

我正在使用 Visual Studio 代碼

Answer 1

所以你想要這樣的東西：

output = ""
original_file  = ()

with open("file.txt", "r") as file:
    original_file = file.readlines()

for line in original_file:
    for word in line:
        if word == "#condition":
            output += "#new value"
        elif word == "#condition2":
            output += "#new value2"
        else:
            output += word  


with open("file.txt", "w") as file:
    file.write(output)

順便說一下，我還沒有運行代碼，所以如果有任何錯誤，請告訴我。

Answer 2

所以這里有一個簡短的例子：

with open("data.txt","r") as fin:
    with open("output2.txt","w") as fout:
        for aline in fin:
            new_data = aline
            if new_data.startswith("some data"):
                new_data = "replacement=string"
            elif "coffeebreak" in new_data:
                new_data = "coffee is schedualed at 10 on the 15th"
            fout.write(new_data+"\n") # You would want to end the line with a linebreak.

“data.txt”的內容：

some data we are logging
some data we are logging
we are having coffeebreak sometime soon
some data we are logging
something about the brown fox

Output 在我們的第二個文件“output2.txt”中：

replacement=string
replacement=string
coffee is schedualed at 10 on the 15th
replacement=string
something about the brown fox

使用with有很多好處，例如之后無需關閉文件。

希望這對你來說很好！