Return value when writing to a file object

In Python 2, writing directly to a file handle returns None:

hi = sys.stdout.write('hello world\n')
# Out: hello world
type(hi)
# Out: <type 'NoneType'>

In Python 3, writing to a handle will return the number of characters written when writing text, and the number of bytes written when writing bytes:

import sys

char_count = sys.stdout.write('hello world 🐍\n')
# Out: hello world 🐍
char_count
# Out: 14

byte_count = sys.stdout.buffer.write(b'hello world \xf0\x9f\x90\x8d\n')
# Out: hello world 🐍
byte_count
# Out: 17

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