Black should remove unnecessary outer parentheses around function arguments

[jdufresne]

Operating system: Fedora release 27
Python version: Python 3.6.6
Black version: 18.9b0
Does also happen on master: Yes

Input:

print((1))

Expected change:

print(1)

Actual: file left unchanged

[rooterkyberian]

print(((1))) will also be unchanged where we expected it to be equal to print(1)

Something that is likely another issue, but similar:

f = lambda a: (1)
g = lambda a: ((1))

will also be left unchanged

tested with
Python version: Python 3.7.0
Black version: 18.9b0

[sr105]

Duplicate of #445

[JelleZijlstra]

Don't think this is quite a dupe.

[sr105]

Both involve black removing unnecessary tuple parentheses. The code to fix one will likely fix the other.