no spaces are added around arithmetic operations inside fstrings

[radkujawa]

Steps to reproduce the behavior:

1. Take this file:

a,b=0,1
s=f"{a+b}"
c=a+b

2. Run Black on it
3. Code is formatted like that:

a, b = 0, 1
s = f"{a+b}"
c = a + b

but I would expect:

a, b = 0, 1
s = f"{a + b}"
c = a + b

• Version: black, version 19.3b0
• OS and Python version: Linux/Python 3.7.4

[JelleZijlstra]

Yes, we don't currently do any formatting inside f-strings. This is essentially a duplicate of #567.

[radkujawa]

OK, thanks for answer!
sorry to bother, didn't find #567.