Package: black
Version: 18.9b0-1-4
Severity: normal

Dear Maintainer,

If I install black I get:
$ sudo LANG=C apt install black
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Suggested packages:
  python-black-doc
The following NEW packages will be installed:
  black
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/75.3 kB of archives.
After this operation, 334 kB of additional disk space will be used.
Selecting previously unselected package black.
(Reading database ... 224706 files and directories currently installed.)
Preparing to unpack .../black_18.9b0-1-4_all.deb ...
Unpacking black (18.9b0-1-4) ...
Setting up black (18.9b0-1-4) ...
  File "/usr/lib/python3/dist-packages/black.py", line 128
    ) -> "FileMode":
    ^
SyntaxError: invalid syntax

  File "/usr/lib/python3/dist-packages/blackd.py", line 31
    black.out(f"blackd version {ver} listening on {bind_host} port {bind_port}")
                                                                              ^
SyntaxError: invalid syntax

  File "/usr/lib/python3/dist-packages/blib2to3/pgen2/tokenize.py", line 123
    **{f"{prefix}'''": single3prog for prefix in _strprefixes},
                    ^
SyntaxError: invalid syntax

dpkg: error processing package black (--configure):
 subprocess installed post-installation script returned error exit status 1
Processing triggers for man-db (2.7.6.1-2) ...
Errors were encountered while processing:
 black
E: Sub-process /usr/bin/dpkg returned an error code (1)


I also get the error if I run black alone:

$ black
Traceback (most recent call last):
  File "/usr/bin/black", line 11, in <module>
    load_entry_point('black==18.9b0', 'console_scripts', 'black')()
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 561, in 
load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2631, 
in load_entry_point
    return ep.load()
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2291, 
in load
    return self.resolve()
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2297, 
in resolve
    module = __import__(self.module_name, fromlist=['__name__'], level=0)
  File "/usr/lib/python3/dist-packages/black.py", line 128
    ) -> "FileMode":
    ^
SyntaxError: invalid syntax


Maybe black depends on a newer version of Python3 than 3.5.3?
I have not tried to upgrade python3.

>From https://pypi.org/project/black/ I read:
" Black can be installed by running pip install black. It requires
Python 3.6.0+ to run but you can reformat Python 2 code with it, too. "

I suggest to update the package dependency on python3.

Bye

-- System Information:
Debian Release: 9.5
  APT prefers stable
  APT policy: (990, 'stable'), (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-8-amd64 (SMP w/4 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8), 
LANGUAGE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages black depends on:
ii  python3                3.5.3-1
ii  python3-appdirs        1.4.0-3
ii  python3-attr           16.3.0-1
ii  python3-click          6.6-1
ii  python3-pkg-resources  33.1.1-1
ii  python3-toml           0.9.1-1

black recommends no packages.

Versions of packages black suggests:
pn  python-black-doc  <none>

-- no debconf information

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