try: import uio as io except ImportError: import io a = io.StringIO() print('io.StringIO' in repr(a)) print(a.getvalue()) print(a.read()) a = io.StringIO("foobar") print(a.getvalue()) print(a.read()) print(a.read()) a = io.StringIO() a.write("foo") print(a.getvalue()) a = io.StringIO("foo") a.write("12") print(a.getvalue()) a = io.StringIO("foo") a.write("123") print(a.getvalue()) a = io.StringIO("foo") a.write("1234") print(a.getvalue()) a = io.StringIO() a.write("foo") print(a.read()) a = io.StringIO() a.close() for f in [a.read, a.getvalue, lambda:a.write("")]: # CPython throws for operations on closed I/O, MicroPython makes # the underlying string empty unless MICROPY_CPYTHON_COMPAT defined try: f() print("ValueError") except ValueError: print("ValueError")