DynamoDB's Binary type issues with Python 3 #846
Description
The Binary class has a problematic implementation of the __str__() method that assumes str and bytes are interchangeable. Example:
Python 3.5.2 (default, Sep 28 2016, 18:11:34)
>>> from boto3.dynamodb.types import Binary
>>> b = Binary(b'hello')
>>> b
Binary(b'hello')
>>> print(b)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: __str__ returned non-string (type bytes)
>>> bytes(b)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'Binary' object is not iterable
The above examples all succeed under Python 2.7.