from io import BytesIO
from cStringIO import StringIO
from six import BytesIO as six_BytesIO

data_small = b'foo'*1000
data_large = b'foo'*1000000

%timeit -n 100000 BytesIO(data_small)
%timeit -n 100000 StringIO(data_small)
%timeit -n 100000 six_BytesIO(data_small)

%timeit -n 100000 BytesIO(data_large)
%timeit -n 100000 StringIO(data_large)
%timeit -n 100000 six_BytesIO(data_large)

bio_small = BytesIO(data_small)
sio_small = StringIO(data_small)
six_small = six_BytesIO(data_small)

bio_large = BytesIO(data_large)
sio_large = StringIO(data_large)
six_large = six_BytesIO(data_large)

bio_small.seek(0)
sio_small.seek(0)
six_small.seek(0)

%timeit -n 1000 bio_small.read(1)
%timeit -n 1000 sio_small.read(1)
%timeit -n 1000 six_small.read(1)

%timeit -n 100000 bio_large.read(1)
%timeit -n 100000 sio_large.read(1)
%timeit -n 100000 six_large.read(1)

bio_small.seek(0)
sio_small.seek(0)
six_small.seek(0)

bio_large.seek(0)
sio_large.seek(0)
six_large.seek(0)

%timeit -n 100 bio_small.read(10)
%timeit -n 100 sio_small.read(10)
%timeit -n 100 six_small.read(10)

%timeit -n 100 bio_large.read(1000)
%timeit -n 100 sio_large.read(1000)
%timeit -n 100 six_large.read(1000)