Binary File in Python Notes for Class 12

  Binary File Handling in Python

• Binary files store data in binary format (0s and 1s) instead of plain text.
• Examples: Images, videos, executables, .dat, .bin files.    

    Writing Data to Binary file

•   Use pickle.dump() to write Python objects in binary form.

      Example:

import pickle
data = {"name": "Ankit", "age": 21}

file = open("data.bin", "wb")
pickle.dump(data, file)
file.close()

    Reading Data from Binary File

• Use pickle.load() to read data back.

        Example:

import pickle

file = open("data.bin", "rb")
data = pickle.load(file)
print(data)
file.close()

  Appending Data in Binary File

import pickle

file = open("data.bin", "ab")
pickle.dump(["Python", "File", "Binary"], file)
file.close()

       Key Points

• Always open binary files in binary mode (b).
• pickle module is used for serializing (writing) and deserializing (reading).
• Don’t try to open binary files in text editor — data will look like garbage.
• Use try-except with EOFError to detect end of file.