如何在 Python 中更新文字檔案中的特定行？

Editing a Specific Line in a Text File in Python

You have a text file containing lines of data, and you need to update a specific line, say the second one, with a new value. You may have tried using "myfile.writelines('Mage')[1]" but it produced an incorrect result.

The key to editing a specific line in a text file is to load the entire file into memory and manipulate it as a list of lines. Here's how to do it:

# Read the file into a list of lines
with open('stats.txt', 'r') as file:
    data = file.readlines()

# Make the desired edit. Here, we're changing line 2 to 'Mage'.
data[1] = 'Mage\n'

# Write the updated list of lines back to the file
with open('stats.txt', 'w') as file:
    file.writelines(data)

In this approach:

• data = file.readlines() reads the file into a list of lines.
• data[1] = 'Mage\n' updates the second line with 'Mage'.
• with open('stats.txt', 'w') as file: opens the file for writing and rewrites the entire contents with the updated line.

The reason behind this approach is that you cannot directly edit a specific line in a text file. The file can only be overwritten by entire lines, so rewriting the entire file with the updated line is necessary.

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