最新版的MacOS Sierra默認帶的python環境仍然為2.7.10，本文將介紹使用Brew安裝python3.5并做簡單的配置，打造python2，python3共存的開發環境

直接嘗試brew安裝，提示需要執行brew link gdbm

thatsitdeMacBook-Pro:~ thatsit$ brew install python3

Updating Homebrew...

Error: You must `brew link gdbm` before python3 can be installed

thatsitdeMacBook-Pro:~ thatsit$

按提示執行brew link gdbm，提示目錄權限問題

thatsitdeMacBook-Pro:~ thatsit$ brew link gdbm

Linking /usr/local/Cellar/gdbm/1.12...

Error: Could not symlink share/man/man3/gdbm.3

/usr/local/share/man/man3 is not writable.

thatsitdeMacBook-Pro:~ thatsit$

嘗試sudo執行brew，提示已經不再支持以root權限執行

thatsitdeMacBook-Pro:~ thatsit$ sudo brew link gdbm

Password:

Error: Running Homebrew as root is extremely dangerous and no longer supported.

As Homebrew does not drop privileges on installation you would be giving all

build scripts full access to your system.

thatsitdeMacBook-Pro:~ thatsit$

確認目錄權限并調整

thatsitdeMacBook-Pro:~ thatsit$ ll /usr/local/share/man/man3/

total 240

-rw-rw-r-- 1 root wheel 25111 1 12 2014 cdt.3

-rw-rw-r-- 1 root wheel 27894 1 12 2014 cgraph.3

-rw-rw-r-- 1 root wheel 1762 1 12 2014 expr.3

-rw-rw-r-- 1 root wheel 2103 1 12 2014 gvc.3

-rw-rw-r-- 1 root wheel 2966 1 12 2014 gvpr.3

-rw-rw-r-- 1 root wheel 9628 1 12 2014 pack.3

-rw-rw-r-- 1 root wheel 5386 1 12 2014 pathplan.3

-rw-rw-r-- 1 root wheel 15026 1 12 2014 tcldot.3tcl

-rw-rw-r-- 1 root wheel 7109 1 12 2014 tkspline.3tk

-rw-rw-r-- 1 root wheel 8157 1 12 2014 xdot.3

thatsitdeMacBook-Pro:~ thatsit$

thatsitdeMacBook-Pro:~ thatsit$ sudo chown -R thatsit /usr/local/share/man/man3/

thatsitdeMacBook-Pro:~ thatsit$

再次執行，OK

thatsitdeMacBook-Pro:~ thatsit$ brew link gdbm

Linking /usr/local/Cellar/gdbm/1.12... 12 symlinks created

thatsitdeMacBook-Pro:~ thatsit$

thatsitdeMacBook-Pro:~ thatsit$ brew install python3

==> Installing dependencies for python3: xz

==> Installing python3 dependency: xz

==> Downloading https://homebrew.bintray.com/bottles/xz-5.2.2.el_capitan.bottle.tar.gz

######################################################################## 100.0%

==> Pouring xz-5.2.2.el_capitan.bottle.tar.gz

Error: The `brew link` step did not complete successfully

The formula built, but is not symlinked into /usr/local

Could not symlink lib/pkgconfig/liblzma.pc

/usr/local/lib/pkgconfig is not writable.

You can try again using:

brew link xz

==> Summary

🍺 /usr/local/Cellar/xz/5.2.2: 91 files, 1.4M

==> Installing python3

==> Downloading https://homebrew.bintray.com/bottles/python3-3.5.2_3.el_capitan.bottle.tar.gz

######################################################################## 100.0%j

==> Pouring python3-3.5.2_3.el_capitan.bottle.tar.gz

Error: The `brew link` step did not complete successfully

The formula built, but is not symlinked into /usr/local

Could not symlink lib/pkgconfig/python-3.5.pc

/usr/local/lib/pkgconfig is not writable.

You can try again using:

brew link python3

==> Using the sandbox

==> /usr/local/Cellar/python3/3.5.2_3/bin/python3 -s setup.py --no-user-cfg install --force --verbose --install-scripts=/usr/local/Cellar/python3/3.5.2_3/bin --install-lib=/usr/local/lib/python3.5/site-packages --single-version-externally-managed --record=installed.txt

==> /usr/local/Cellar/python3/3.5.2_3/bin/python3 -s setup.py --no-user-cfg install --force --verbose --install-scripts=/usr/local/Cellar/python3/3.5.2_3/bin --install-lib=/usr/local/lib/python3.5/site-packages --single-version-externally-managed --record=installed.txt

==> /usr/local/Cellar/python3/3.5.2_3/bin/python3 -s setup.py --no-user-cfg install --force --verbose --install-scripts=/usr/local/Cellar/python3/3.5.2_3/bin --install-lib=/usr/local/lib/python3.5/site-packages --single-version-externally-managed --record=installed.txt

==> Caveats

Pip, setuptools, and wheel have been installed. To update them

pip3 install --upgrade pip setuptools wheel

You can install Python packages with

pip3 install

They will install into the site-package directory

/usr/local/lib/python3.5/site-packages

See: https://github.com/Homebrew/brew/blob/master/docs/Homebrew-and-Python.md

.app bundles were installed.

Run `brew linkapps python3` to symlink these to /Applications.

==> Summary

🍺 /usr/local/Cellar/python3/3.5.2_3: 3,498 files, 53.3M

thatsitdeMacBook-Pro:~ thatsit$

添加python3環境變量

thatsitdeMacBook-Pro:~ thatsit$ tail -1 /etc/profile

export PATH=/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/Cellar/python3/3.5.2_3/bin

thatsitdeMacBook-Pro:~ thatsit$

測試

thatsitdeMacBook-Pro:bin thatsit$ python

Python 2.7.10 (default, Oct 23 2015, 19:19:21)

[GCC 4.2.1 Compatible Apple LLVM 7.0.0 (clang-700.0.59.5)] on darwin

Type "help", "copyright", "credits" or "license" for more information.

>>> ^D

thatsitdeMacBook-Pro:bin thatsit$ python3

Python 3.5.2 (default, Oct 11 2016, 05:05:28)

[GCC 4.2.1 Compatible Apple LLVM 8.0.0 (clang-800.0.38)] on darwin

Type "help", "copyright", "credits" or "license" for more information.

>>>

thatsitdeMacBook-Pro:bin thatsit$

DONE

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