encoder_fail.py

from requests_toolbelt import MultipartEncoderMonitor

fields_work = [(u'test', 'foo'), ('bar', u'baz'), ('baz', '')]

m_work = MultipartEncoderMonitor.from_fields(fields=fields_work)


fields_fail = [(u'test', u'')]

m_fail = MultipartEncoderMonitor.from_fields(fields=fields_fail)

Traceback

Traceback (most recent call last):
  File "fail.py", line 10, in <module>
    m_fail = MultipartEncoderMonitor.from_fields(fields=fields_fail)
  File "/opt/active_version/lib/python2.7/site-packages/requests_toolbelt/multipart/encoder.py", line 297, in from_fields
    encoder = MultipartEncoder(fields, boundary, encoding)
  File "/opt/active_version/lib/python2.7/site-packages/requests_toolbelt/multipart/encoder.py", line 89, in __init__
    self._prepare_parts()
  File "/opt/active_version/lib/python2.7/site-packages/requests_toolbelt/multipart/encoder.py", line 171, in _prepare_parts
    self.parts = [Part.from_field(f, enc) for f in fields]
  File "/opt/active_version/lib/python2.7/site-packages/requests_toolbelt/multipart/encoder.py", line 383, in from_field
    body = coerce_data(field.data, encoding)
  File "/opt/active_version/lib/python2.7/site-packages/requests_toolbelt/multipart/encoder.py", line 359, in coerce_data
    return CustomBytesIO(data, encoding)
  File "/opt/active_version/lib/python2.7/site-packages/requests_toolbelt/multipart/encoder.py", line 425, in __init__
    super(CustomBytesIO, self).__init__(buffer)
TypeError: 'unicode' does not have the buffer interface