3 Python Writing files

1. What Does Writing a File Mean?

Writing a file means saving data into a file using Python.

In simple words:
👉 Python opens a file
👉 Writes text into it
👉 Saves the data permanently

2. File Write Modes

We mainly use these modes:

Mode Meaning
"w" Write (overwrite file)
"a" Append (add to file)
"x" Create new file

3. Write to a File ("w" Mode)

⚠️ "w" mode deletes old data.

Example


 

4. Best Way: Write Using with

This is the recommended way.

Example


 

5. Write Multiple Lines

Example


 

6. Append to a File ("a" Mode)

Adds text without removing old content.

Example


 

7. Write List Data to File

Example


 

8. Write User Input to File

Example


 

9. Create New File ("x" Mode)

Example


 

10. Write File Safely Using Try Except

Example


 

11. Common Beginner Mistakes

❌ Forgetting New Line


 

✔ Use:


 

❌ Writing in Read Mode


 

❌ Error.

12. Simple Practice Examples

Example 1: Save Numbers


 

Example 2: Append Log


 

Example 3: Write Marks


 

13. Summary (Python Writing Files)

✔ Writing saves data to file
"w" overwrites file
"a" adds data
"x" creates new file
✔ Use with for safety

📘 Perfect for Beginner eBook

This chapter is ideal for:

  • Python beginner books

  • School & college students

  • Self-learners

If you want next, I can write:

  • Appending Files

  • CSV File Handling

  • JSON File Handling

  • Mini Python Projects

Just tell me 😊

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