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1. Read File2. Write File3. Append to File4. Read CSV File5. Write CSV File6. JSON Read7. JSON Write8. File Copy9. File Rename10. Read Binary File11. Write Binary File12. Count Words in File13. Count Lines in File14. Count Characters in File15. Search Substring in File16. Iterate File Lines17. File Metadata18. File Compression19. File Decompression20. Delete File

Write Binary File in Python

Create a small binary file from bytes.

BeginnerFile Handling ProgramsExample 11 of 20
write-binary-file.py
1# Program to write a small binary file
2

3filename = input("Enter binary filename to write: ")
4

5data = bytes([0, 1, 2, 3, 255])
6

7with open(filename, "wb") as f:
8    f.write(data)
9

10print("Binary data written to", filename)

Output

Enter binary filename to write: sample.bin
Binary data written to sample.bin

What's going on

Opening in "wb" mode writes raw bytes; here we create a simple bytes object as a demo.

After this program

If the idea is still fuzzy, read Day 14: File Handling in the Python course. For a short check, try the Python quiz (300 questions). Stay with all 20 file handling programs, or see every topic on Python exercises.

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