Скачать или смотреть How to Read and Write Variables in Text Files Using Python

Discover a simple method to read variable values from one text file and write them to another in Python, perfect for beginners.
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How to Read and Write Variables in Text Files Using Python: A Beginner's Guide

If you're new to programming in Python and you're looking to perform basic file operations — such as reading a variable from one file and writing it to another — you've come to the right place! This guide will guide you through the process, step by step, with a clear example to illustrate the concept.

Understanding the Problem

Consider this scenario: you have a text file (let’s call it file1) containing several variable values, and you need to extract the value of one specific variable from it. You then want to insert this value into another text file (let’s call it file2) while ensuring that the other contents in file2 remain unchanged.

Example Files

file1 contents:

[[See Video to Reveal this Text or Code Snippet]]

file2 contents:

[[See Video to Reveal this Text or Code Snippet]]

From these files, your goal is to replace the suiteName value in file2 with the value of variable c from file1. After the operation, file2 should look like this:

[[See Video to Reveal this Text or Code Snippet]]

Step-by-Step Solution

Let’s break down how this can be accomplished in Python.

1. Open the Files

To read and write files in Python, we’ll use the built-in function open(). Here’s how you can open both files.

2. Read the Value from file1

Next, you will read the contents of file1, focus on the line that contains variable c, and extract its value.

3. Update the Value in file2

After retrieving the value from file1, you will read file2, replace the suiteName value with the new value extracted from file1, and then save the changes.

Complete Python Code

Here’s the entire code that accomplishes the above steps:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Code

File Reading: The with open(...) statement ensures that files are properly managed, and they will be closed automatically once the block is exited.

Extracting Value: We check if each line starts with 'c', and if so, we split the line on the = character to get the value.

Replacing the Value: Using re.sub(), we replace the current suiteName value in file2 with the new value fetched from file1.

Writing Back: Finally, we open file2 again in write mode and save the updated content.

Conclusion

By following this guide, you should now have a clear understanding of how to read variables from one text file and write them into another using Python. Not only have you learned to manipulate text files, but you've also practiced using Python’s built-in functions for file I/O operations.

With practice, these operations will become second nature, opening the door to more complex programming tasks!

Now, go ahead and try this code on your own files to see it in action!