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Python Bytes and Bytearray

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In Python, bytes and bytearray are used to handle binary data.
They look like lists of integers but represent data in bytes form (0 to 255).

🔹 Bytes – Immutable Binary Data

data = bytes([65, 66, 67])
print(data)         # b'ABC'
print(data[0])      # 65

✅ You cannot change values in a bytes object.

🔹 Bytearray – Mutable Binary Data

data = bytearray([65, 66, 67])
print(data)         # bytearray(b'ABC')
data[1] = 90
print(data)         # bytearray(b'AZC')

✅ You can change values in a bytearray.

🔹 From String to Bytes

text = "hello"
b = bytes(text, 'utf-8')
print(b)  # b'hello'

🔹 From Bytes to String

b = b'hello'
text = b.decode('utf-8')
print(text)  # hello

🔹 Convert to Bytearray

b = b"data"
ba = bytearray(b)

🔹 Useful Methods

Method Works On Description
.decode() bytes Converts to string
.append(x) bytearray Adds one byte to the end
.pop() bytearray Removes the last byte
.reverse() bytearray Reverses byte order
.extend([]) bytearray Adds multiple bytes

🔹 Use Case: Binary Files

with open("file.bin", "rb") as f:
    content = f.read()
    print(content)  # bytes

🧪 Try It Yourself

  • Convert string to bytes

  • Modify bytearray data

  • Decode bytes into text

  • Use .append() or .reverse() on bytearray

Practice Questions

Q1. Write a Python program to create a bytes object with values [65, 66, 67] and print it.

Q2. Write a Python program to print the second byte from a bytes object.

Q3. Write a Python program to try changing a byte in a bytes object and observe the error (bytes are immutable).

Q4. Write a Python program to create a bytearray and modify the first element.

Q5. Write a Python program to convert the string "Python" into bytes using UTF-8 encoding.

Q6. Write a Python program to decode b'Hello' into a string using .decode().

Q7. Write a Python program to append the value 88 to a bytearray using append().

Q8. Write a Python program to use .reverse() on a bytearray and print the result.

Q9. Write a Python program to convert a bytes object to a bytearray and modify its content.

Q10. Write a Python program to read a binary file and print its content in bytes.

Python Bytes and Bytearray Quiz

Q1: What is the data type of b"hello"?

A. str
B. bytes
C. bytearray
D. list

Q2: What value range can bytes hold?

A. 0–100
B. 0–255
C. 0–1024
D. Unlimited

Q3: What is the main difference between bytes and bytearray?

A. bytes are faster
B. bytearray is immutable
C. bytes are immutable
D. No difference

Q4: What will b"data"[0] return?

A. "d"
B. 'd'
C. 100
D. Error

Q5: Which method converts a bytes object to string?

A. encode()
B. parse()
C. decode()
D. convert()

Q6: Can you change a value in a bytes object?

A. Yes
B. Only once
C. No
D. Only if it's a single character

Q7: Which method adds a new byte to a bytearray?

A. add()
B. append()
C. insert()
D. push()

Q8: What does bytearray(b'data') return?

A. List
B. bytes
C. bytearray
D. string

Q9: What does reverse() do in bytearray?

A. Sort values
B. Remove last item
C. Reverse byte order
D. Convert to string

Q10: What encoding is commonly used with bytes() and .decode()?

A. ascii
B. binary
C. hex
D. utf-8
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