Unrelated PRs failing Travis tests due to test_sympify

[Oscar Benjamin]

Hi all,

Travis tests are failing in unrelated PRs due to the same issue. You
can see an example here:
https://travis-ci.org/sympy/sympy/jobs/457806002

The test run that fails is for optional dependencies on Python 3.6. I
guess that either a bug has snuck into master or there has been some
change in the dependencies.

--
Oscar

[Kalevi Suominen]

Python's `generate_tokens()` was recently updated to add a newline token if there was none in the input: https://github.com/python/cpython/commit/c4ef4896eac86a6759901c8546e26de4695a1389#diff-e6b083beac7705d82a4e21f6391963a7R658. That became effective when conda-forge updated Python-3.6.6 to 3.6.7. The change breaks sympification of `lambda` because the code expects only two tokens instead of three.

Kalevi Suominen

[Aaron Meurer]

I have a fix at https://github.com/sympy/sympy/pull/15523

Aaron Meurer

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