Create bytearray (mutable) Dry Run in PYTHON

Create bytearray (mutable) is an interactive PYTHON dry run visualizer from the Bytes programs section. Study the source code, then use the execution controls to follow each step, variable update, highlighted line, and console output.

This page provides a browser-based dry run with source-code highlighting, auto-scroll, voice narration controls, and execution output for learning the program step by step.

Create bytearray (mutable) Program Code

# bytearray – mutable sequence of bytes
ba1 = bytearray(b"hello")          # from bytes
ba2 = bytearray([72, 101, 108, 108, 111])  # from list
ba3 = bytearray("world", "utf-8")  # from string
ba4 = bytearray(5)                 # zero-filled

print("ba1:", ba1, "type:", type(ba1))
print("ba2:", ba2)
print("ba3:", ba3)
print("ba4:", ba4)

# mutable: modify
ba1[0] = 72   # 'h' → 'H' (ASCII 72)
ba1[1:3] = b"EY"  # replace 'el' with 'EY'
print("after mutation:", ba1)

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