Mark Dickinson added the comment:

> in looking through test_cmath, it appears that only the two numeric
> argument form of complex(i, j) is tested for any of the functions, not the
> complex('i+nj') string form.

We're testing the cmath functions on complex number inputs; I don't think it 
matters much how those complex numbers are created. The string form of the 
constructor can't create any complex numbers that the two-argument `complex(x, 
y)` form can't, so we're not losing test coverage by only using the `complex(x, 
y)` form.

The complex number creation from both strings and pairs of floats should be 
tested independently, of course.

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nosy: +mark.dickinson

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<http://bugs.python.org/issue27763>
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