import io

a = io.StringIO()
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())
