Black is changing string output

[ghost]

Black is changing string output.

Here's a small test case:

raise ValueError('"{}" is an invalid base58 encoded'
                 'character'.format('l'))

Becomes:

raise ValueError('"{}" is an invalid base58 encoded' "character".format("l"))

Environment (please complete the following information):

• Version: 19.10b0 and master
• OS and Python version: Linux / Python 3.7.3

Does this bug also happen on master? To answer this, you have two options:

1. Use the online formatter at https://black.now.sh/?version=master, which will use the
   latest master branch. https://black.now.sh/?version=master&state=_Td6WFoAAATm1rRGAgAhARYAAAB0L-Wj4ACfAHpdAD2IimZxl1N_WmXTfF4pk2diOB2w7CF3u5csmBIqM4tZ28bz-Wsjw8BMMi3lwqytjqgVBMVZiUacQNqGZGmn05W4ih2sBeTwYw0rsxRWBiFpcmw2i3q879NrXW32Ni69xWm_UcfshWKDsKmY5ZLH_kSJlcUumQkQtenWAAAACm-bFP1IlaQAAZYBoAEAAAF7o3mxxGf7AgAAAAAEWVo=

[ofek]

#26

[JelleZijlstra]

It's the same string at runtime. The formatting is definitely not great, but we already have #26 to track that.

[ghost]

Ah, gotcha. Thank you!