micropython/tests/basics/io_bytesio_ext.py

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# Extended stream operations on io.BytesIO
try:
import uio as io
except ImportError:
import io
a = io.BytesIO(b"foobar")
a.seek(10)
print(a.read(10))
a = io.BytesIO()
print(a.seek(8))
a.write(b"123")
print(a.getvalue())
print(a.seek(0, 1))
print(a.seek(-1, 2))
a.write(b"0")
print(a.getvalue())
a.flush()
print(a.getvalue())
a.seek(0)
arr = bytearray(10)
print(a.readinto(arr))
print(arr)