Comment #3 on issue 3753 by mbea...@gmail.com: CRITICAL: <lambda>() keywords must be strings in RBTools 0.7.0
https://code.google.com/p/reviewboard/issues/detail?id=3753

I think this is caused by https://github.com/reviewboard/rbtools/commit/8c8e4eb7a64be3da8df833608dc6b4f95ccc03e0 with python 2.6.

The problem is that lambda behavior has apparently changed between 2.6 and 2.7:

$ python2.7 -c "from __future__ import unicode_literals; x = lambda a='a', b='b': a+b; print x(**{'a':'c', 'b':'d'})"
cd
$ python2.6 -c "from __future__ import unicode_literals; x = lambda a='a', b='b': a+b; print x(**{'a':'c', 'b':'d'})"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
TypeError: <lambda>() keywords must be strings

Using python 2.7 fixes the problem. Not sure if rbtools is supposed to work with 2.6 but if it is, the problem is here:

https://github.com/reviewboard/rbtools/blob/release-0.7.2/rbtools/commands/post.py#L402

review_requests.create is a lambda, it is being fed unicode literals.

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