memoryview with bytes / bytearray Dry Run in PYTHON

memoryview with bytes / bytearray 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.

memoryview with bytes / bytearray Program Code

# memoryview – zero-copy view of bytes/bytearray
b = b"python programming"
mv = memoryview(b)

print("memoryview bytes:", bytes(mv))
print("len:", len(mv))
print("mv[0]:", mv[0])          # 112
print("mv[1:5] bytes:", bytes(mv[1:5]))

# bytearray + memoryview (mutable)
ba = bytearray(b"abcdef")
mv2 = memoryview(ba)
mv2[0] = 90                     # modify through view
print("ba after mv2[0]=90:", ba)

# cast to different format (e.g., 'H' unsigned short)
ba2 = bytearray(b"\x01\x00\x02\x00")
mv3 = memoryview(ba2).cast('H')
print("cast to unsigned short:", mv3[0], mv3[1])

View the complete Bytes programs page.