lambdify throws error with abs

[moorepants]

This is from #7767 and there is a potential fix in #7779.

Just found a bug in lambdify

k = symbols('k', complex=True)
lambdify([k], abs(k**2))(10.01+0.1j)

throws

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-144-4ad0dd2e940e> in <module>()
      1 k = symbols('k', complex=True)
----> 2 lambdify([k], abs(k**2))(10.01+0.1j)

/usr/lib64/python2.7/site-packages/numpy/__init__.pyc in <lambda>(_Dummy_82)

TypeError: can't convert complex to float

using sympy.Abs leads to the same exception.

[Shekharrajak]

What is the difference between k and [k] ?

[moorepants]

[k] is a list of one element, k.

[Shekharrajak]

It returns correct answer if we use numpy module :

lambdify([k], abs(k**2),"numpy")(10.01+0.1j)
100.2101

[twmr]

Yes, but not if we don't use the numpy module.