circuitpython/tests/micropython/heapalloc_bytesio2.py

# Creating BytesIO from immutable object should not immediately
# copy its content.
try:
    import uio
    import micropython

    micropython.mem_total
except (ImportError, AttributeError):
    print("SKIP")
    raise SystemExit


data = b"1234" * 256

before = micropython.mem_total()

buf = uio.BytesIO(data)

after = micropython.mem_total()

print(after - before < len(data))
py/objstringio: If created from immutable object, follow copy on write policy. Don't create copy of immutable object's contents until .write() is called on BytesIO. 2017-06-05 16:54:21 -04:00			`# Creating BytesIO from immutable object should not immediately`
			`# copy its content.`
			`try:`
			`import uio`
			`import micropython`
tests: Format all Python code with black, except tests in basics subdir. This adds the Python files in the tests/ directory to be formatted with ./tools/codeformat.py. The basics/ subdirectory is excluded for now so we aren't changing too much at once. In a few places `# fmt: off`/`# fmt: on` was used where the code had special formatting for readability or where the test was actually testing the specific formatting. 2020-03-22 22:26:08 -04:00
py/objstringio: If created from immutable object, follow copy on write policy. Don't create copy of immutable object's contents until .write() is called on BytesIO. 2017-06-05 16:54:21 -04:00			`micropython.mem_total`
			`except (ImportError, AttributeError):`
			`print("SKIP")`
			`raise SystemExit`


			`data = b"1234" * 256`

			`before = micropython.mem_total()`

			`buf = uio.BytesIO(data)`

			`after = micropython.mem_total()`

			`print(after - before < len(data))`