Cannot make URL query string with a parameter without a value

URL query string may contain a parameter, which has no value i.e. http://host/path/?foo or http://host/path/?a=1&foo. Currently Requests does not provide support for that.

In [68]: d
Out[68]: {'a': 1, 'foo': None}

In [69]: tl
Out[69]: [('a', 1), ('foo',)]

In [70]: RequestEncodingMixin._encode_params(d)
Out[70]: 'a=1'

In [71]: RequestEncodingMixin._encode_params(tl)
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-71-5d4dac855108> in <module>()
----> 1 RequestEncodingMixin._encode_params(tl)

/home/f557010/jpm/local/lib/python2.7/site-packages/requests/models.pyc in _encode_params(data)
     87         elif hasattr(data, '__iter__'):
     88             result = []
---> 89             for k, vs in to_key_val_list(data):
     90                 if isinstance(vs, basestring) or not hasattr(vs, '__iter__'):
     91                     vs = [vs]

ValueError: need more than 1 value to unpack

Expected:

'a=1&foo'

[kennethreitz]

in 3.0, i think we can consider making emptry string not result in an =

[agilevic]

It’s not the same as having a parameter without a value. Yours renders the = sign after the parameter name. Some applications will work, but as a matter of providing a complete solution this exact case should be addressed. That urllib doesn’t do it is of no significance. Requests does many things better than standard libraries for HTTP - that is its reason to exist.