There seems to be an issue uploading files with non-ascii character in their names about box.py

[k8n]

And here is a "monkey patch" for requests' field encoder. Say, mod_requests.py ...

#!/usr/bin/env python
# coding: utf-8

__author__ = 'k8n'

import requests
import email.utils
from requests.packages.urllib3.packages import six


def mod_format_header_param(name, value):
    """
    Helper function to format and quote a single header parameter.

    See original doc, minus rfc2331 for non-multiline strings.
    """
    if not any(ch in value for ch in '"\\\r\n'):
        result = '%s="%s"' % (name, value)
        try:
            result.encode('ascii')
        except UnicodeEncodeError:
            pass
        finally:
            return result
    if not six.PY3:  # Python 2:
        value = value.encode('utf-8')
    value = email.utils.encode_rfc2231(value, 'utf-8')
    value = '%s*=%s' % (name, value)
    return value

#monkey patching
requests.packages.urllib3.fields.format_header_param = mod_format_header_param

[tals]

Hey there,

I've sent an email to Box's api support. Let's see what they say :)