シェルから「python3」が効かなくなってしまった…

環境構築についてです。シェルから「python3」が効かなくなってしまいました…。
ふだんなら python3 Pythonファイルのパス を指定したら動くのに、 -bash: python3: command not found と出ます。

きのううっかり brew upgrade したのがきっかけのような気がします。

upgradeしたときのログを見ると、下記のように表示されています。

pyenv 1.2.4 -> 1.2.16
python 3.6.5 -> 3.7.6_1

python3 じゃなくて python したら動くのかな？と思ったけどちがうようです…。

$ python -V
Python 2.7.16

でした。Python2は使わないけど、OSに最初から入っていたので触らずに置いています。

brewでpython3のlistを見たところ下記の通りでした。
brew list python でも同じ結果でした。

$ brew list python3
/usr/local/Cellar/python/3.6.5/bin/2to3
/usr/local/Cellar/python/3.6.5/bin/2to3-3.6
/usr/local/Cellar/python/3.6.5/bin/easy_install-3.6
/usr/local/Cellar/python/3.6.5/bin/idle3
/usr/local/Cellar/python/3.6.5/bin/idle3.6
/usr/local/Cellar/python/3.6.5/bin/pip3
/usr/local/Cellar/python/3.6.5/bin/pip3.6
/usr/local/Cellar/python/3.6.5/bin/pydoc3
/usr/local/Cellar/python/3.6.5/bin/pydoc3.6
/usr/local/Cellar/python/3.6.5/bin/python3
/usr/local/Cellar/python/3.6.5/bin/python3-config
/usr/local/Cellar/python/3.6.5/bin/python3.6
/usr/local/Cellar/python/3.6.5/bin/python3.6-config
/usr/local/Cellar/python/3.6.5/bin/python3.6m
/usr/local/Cellar/python/3.6.5/bin/python3.6m-config
/usr/local/Cellar/python/3.6.5/bin/pyvenv
/usr/local/Cellar/python/3.6.5/bin/pyvenv-3.6
/usr/local/Cellar/python/3.6.5/bin/wheel3
/usr/local/Cellar/python/3.6.5/Frameworks/Python.framework/ (2787 files)
/usr/local/Cellar/python/3.6.5/IDLE 3.app/Contents/ (8 files)
/usr/local/Cellar/python/3.6.5/lib/pkgconfig/ (3 files)
/usr/local/Cellar/python/3.6.5/libexec/bin/ (7 files)
/usr/local/Cellar/python/3.6.5/libexec/pip/ (637 files)
/usr/local/Cellar/python/3.6.5/libexec/setuptools/ (339 files)
/usr/local/Cellar/python/3.6.5/libexec/wheel/ (49 files)
/usr/local/Cellar/python/3.6.5/Python Launcher 3.app/Contents/ (16 files)
/usr/local/Cellar/python/3.6.5/share/doc/ (1002 files)
/usr/local/Cellar/python/3.6.5/share/man/ (2 files)

また、.bashrcは下記の通りでしたが、変えました。

PATH=$HOME/Users/hacosato/Library/Homebrew/bin:$PATH
HOMEBREW_CACHE=$HOME/Users/hacosato/Library/Homebrew/cashe

自分自身の環境でどのようにPythonがインストールされているかもあまり理解できておらずなのですが…アドバイスいただけたらと思います。

macos 10.14.6

追記：

$ echo $PATH
/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/opt/X11/bin

$ brew config
HOMEBREW_VERSION: 2.2.6
ORIGIN: https://github.com/Homebrew/brew
HEAD: (16進数みたいなやつ)
Last commit: 7 days ago
Core tap ORIGIN: https://github.com/Homebrew/homebrew-core
Core tap HEAD: (16進数みたいなやつ)
Core tap last commit: 28 minutes ago
HOMEBREW_PREFIX: /usr/local
CPU: 16-core 64-bit skylake
Homebrew Ruby: 2.6.3 => /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.6.3/bin/ruby
Clang: 11.0 build 1100
Git: 2.21.0 => /Applications/Xcode.app/Contents/Developer/usr/bin/git
Curl: 7.54.0 => /usr/bin/curl
macOS: 10.14.6-x86_64
CLT: N/A
Xcode: 11.2.1
XQuartz: 2.7.11 => /opt/X11

$ brew info python3
python: stable 3.7.6 (bottled), HEAD
Interpreted, interactive, object-oriented programming language
https://www.python.org/
/usr/local/Cellar/python/3.6.4_2 (3,809 files, 58.4MB)
  Poured from bottle on 2018-01-07 at 22:11:55
/usr/local/Cellar/python/3.6.5 (4,872 files, 101.4MB)
  Poured from bottle on 2018-05-15 at 15:52:39
From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/python.rb
==> Dependencies
Build: pkg-config ✔
Required: gdbm ✔, openssl@1.1 ✔, readline ✔, sqlite ✔, xz ✔
==> Options
--HEAD
	Install HEAD version
==> Caveats
Python has been installed as
  /usr/local/bin/python3

Unversioned symlinks `python`, `python-config`, `pip` etc. pointing to
`python3`, `python3-config`, `pip3` etc., respectively, have been installed into
  /usr/local/opt/python/libexec/bin

You can install Python packages with
  pip3 install <package>
They will install into the site-package directory
  /usr/local/lib/python3.7/site-packages

See: https://docs.brew.sh/Homebrew-and-Python
==> Analytics
install: 402,371 (30 days), 1,386,122 (90 days), 5,584,222 (365 days)
install-on-request: 210,466 (30 days), 705,025 (90 days), 2,782,130 (365 days)
build-error: 0 (30 days)

3.7と3.6が混ざってる…？

追記：

.bashrcは、変更して下記の通りです。

# PATH=$HOME/Library/Homebrew/bin:$PATH
# HOMEBREW_CACHE=$HOME/Library/Homebrew/cashe

export PYENV_ROOT="$HOME/.pyenv"
export PATH="$PYENV_ROOT/bin:$PATH"
if which pyenv > /dev/null; then eval "$(pyenv init -)"; fi

$ brew unlink python3
$ brew install python3

を実行しました。結果は下記の通りです。

$ brew unlink python3
==> Tapping homebrew/core
Cloning into '/Users/hacosato/Library/Homebrew/Library/Taps/homebrew/homebrew-core'...
remote: Enumerating objects: 5140, done.
remote: Counting objects: 100% (5140/5140), done.
remote: Compressing objects: 100% (4939/4939), done.
remote: Total 5140 (delta 45), reused 322 (delta 5), pack-reused 0
Receiving objects: 100% (5140/5140), 4.16 MiB | 1.01 MiB/s, done.
Resolving deltas: 100% (45/45), done.
Error: Invalid formula: /Users/hacosato/Library/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/diesel.rb
undefined method `uses_from_macos' for #<Class:0x00007f9757899ae0>
Error: Invalid formula: /Users/hacosato/Library/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/h2o.rb
undefined method `uses_from_macos' for Formulary::FormulaNamespacec579bc6ee01a64170f1603f5fc3ebbad::H2o:Class
（同じエラーが600行ほど）
Error: Cannot tap homebrew/core: invalid syntax in tap!
Error: Failure while executing: /Users/hacosato/Library/Homebrew/bin/brew tap homebrew/core
hacosatonoiMac:~ hacosato$ brew install python3
Initialized empty Git repository in /Users/hacosato/Library/Homebrew/.git/
remote: Enumerating objects: 1967, done.
Updating Homebrew...ects:   0% (1/1967)
remote: Counting objects: 100% (1967/1967), done.
remote: Compressing objects: 100% (1781/1781), done.
remote: Total 1967 (delta 201), reused 713 (delta 102), pack-reused 0
Receiving objects: 100% (1967/1967), 2.01 MiB | 1.26 MiB/s, done.
Resolving deltas: 100% (201/201), done.
From https://github.com/Homebrew/brew
 * [new branch]      master     -> origin/master
HEAD is now at 575f76a Merge pull request #7074 from dawidd6/log-homebrew-path
To restore the stashed changes to /Users/hacosato/Library/Homebrew run:
  'cd /Users/hacosato/Library/Homebrew && git stash pop'
-e:1:in `<main>': undefined method `canonical_segments' for #<Gem::Version "2.3.7"> (NoMethodError)
==> Downloading https://homebrew.bintray.com/bottles-portable-ruby/portable-ruby-2.6.3.mavericks.bottle.tar.gz
Already downloaded: /Users/hacosato/Library/Caches/Homebrew/portable-ruby-2.6.3.mavericks.bottle.tar.gz
==> Pouring portable-ruby-2.6.3.mavericks.bottle.tar.gz
==> Homebrew has enabled anonymous aggregate formulae and cask analytics.
Read the analytics documentation (and how to opt-out) here:
  https://docs.brew.sh/Analytics
No analytics have been recorded yet (or will be during this `brew` run).

==> Homebrew is run entirely by unpaid volunteers. Please consider donating:
  https://github.com/Homebrew/brew#donations
==> Tapping homebrew/core
Cloning into '/Users/hacosato/Library/Homebrew/Library/Taps/homebrew/homebrew-core'...
remote: Enumerating objects: 13, done.
remote: Counting objects: 100% (13/13), done.
remote: Compressing objects: 100% (9/9), done.
remote: Total 684812 (delta 6), reused 11 (delta 4), pack-reused 684799
Receiving objects: 100% (684812/684812), 276.87 MiB | 526.00 KiB/s, done.
Resolving deltas: 100% (448910/448910), done.
Tapped 2 commands and 4922 formulae (5,182 files, 303.7MB).
/Users/hacosato/Library/Homebrew/Library/Homebrew/brew.rb:10:in `<main>': Homebrew must be run under Ruby 2.6! You're running 2.3.7. (RuntimeError)

unlinkができていないでしょうか…？

hoshi-takanori

2020/02/24 03:25

echo $PATH と brew config の結果を貼ってもらってもいいですか？

hoshi-takanori

2020/02/24 03:28

あと、brew info python3 も。

quickquip

2020/02/24 04:00

自分が使っていたのが、pyenvで入れたPython3なのか、brewで入れたPython3なのか、はたまた別の何かなのか、自分で理解していますか?

質問をすることでしか得られない、回答やアドバイスがある。

15分調べてもわからないことは、質問しよう！

関連した質問