Black: Unable to install black with pip and python 2.7

[borisyordanov]

Howdy! Sorry you're having trouble. To expedite your experience,
provide some basics for me:

Operating system: macOS High Sierra 10.13.4
Python version: 2.7.10/3.7.0
Black version: N/A
Does also happen on master:

If i use pip i get this:

pip install black
Collecting black
Could not find a version that satisfies the requirement black (from versions: )
No matching distribution found for black

So i tried installing from Github and got this:

pip install "git+https://github.com/ambv/black.git"
Collecting git+https://github.com/ambv/black.git
  Cloning https://github.com/ambv/black.git to /private/var/folders/d1/xvn4kf7501xbnpp3grb11w6rhdspfc/T/pip-req-build-SvhG55
  Installing build dependencies ... done
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/private/var/folders/d1/xvn4kf7501xbnpp3grb11w6rhdspfc/T/pip-req-build-SvhG55/setup.py", line 13
        def get_long_description() -> str:
                                   ^
    SyntaxError: invalid syntax

    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /private/var/folders/d1/xvn4kf7501xbnpp3grb11w6rhdspfc/T/pip-req-build-SvhG55/

Is it possible because i have two python version pip is trying to install black as a Python2 package and it therefore fails? How can i solve this problem?

[zsol]

Black requires python 3.6 to run, so your hypothesis is probably right :) Try using pip that ships with python3.6

[rerock]

run into the same problem with python version. install black with brew instead.

[chespinoza]

I've been having the same issue with Python 3.7

[illfated]

@chespinoza : Probably a good idea to open a new issue ticket for issues with 3.7 and with all the required information (unless there is an existing open issue for that version already).

[primordialstew]

Black requires python 3.6 to run, so your hypothesis is probably right :) Try using pip that ships with python3.6

This is helpful in a pragmatic way, but is there any good info on when other Python versions are likely to be supported? Many of us work in managed environments where we don't have a choice of Python version, but would love to use such a useful tool in our daily work.

[JelleZijlstra]

We're unlikely to support running Black using Python versions lower than 3.6.

[welovemicro]

Just came across same issue on Mojave:
pip3 install black

Add aliases for py3 if you like to make it permanent (In ~/.bashrc or ~/.zshrc):
alias python="python3"
alias pip="pip3"

[callumblanchard]

I fixed this by adding the --pre flag, to install the python 3.7 pre-release version of black :)
pip install --pre black
or with pipenv:
pipenv install --dev --pre black

Using python 3.7 on Windows 10

[AhmetCanSolak]

Python 3.7.4 conda env. pip install black still gives Could not find a version that satisfies the requirement black and i tried --pre flag, didn't help.
Also using brew is not an option, i want to have black as dependency and manage dependencies with pip only.

[tylertroy]

I had this issue using Ubuntu 16.04 and python3.7. pip install --pre black was not useful for me. The issue I faced was that no python dev libraries were installed. After, sudo apt install python3.7-dev, it works.

[smart-patrol]

Why is this issue closed? @zsol

Running 3.7.6 on MacOS Mojave and getting:

    In file included from regex_3/_regex.c:48:
    /usr/local/Cellar/python/3.7.6_1/Frameworks/Python.framework/Versions/3.7/include/python3.7m/Python.h:25:10: fatal error: 'stdio.h' file not found
    #include <stdio.h>
             ^~~~~~~~~
    1 error generated.
    error: command 'clang' failed with exit status 1
    ----------------------------------------
ERROR: Command errored out with exit status 1: /usr/local/opt/python/bin/python3.7 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/cv/ppbrx60d5ss85z4ryygmmswjlftsg3/T/pip-install-1bo1zb4y/regex/setup.py'"'"'; __file__='"'"'/private/var/folders/cv/ppbrx60d5ss85z4ryygmmswjlftsg3/T/pip-install-1bo1zb4y/regex/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /private/var/folders/cv/ppbrx60d5ss85z4ryygmmswjlftsg3/T/pip-record-le0u05m8/install-record.txt --single-version-externally-managed --compile Check the logs for full command output.

Running pip install --pre black does not work.

[zsol]

It's closed because the issue was about not being able to install black on python 2.7

[Dean-Christian-Armada]

pip install --pre black also did not work for me.
Upgrading my python with brew upgrade python did the trick. After upgrading, I immediately was able to install black with pip3 install black