安装后 python 3.7.2 usr/bin 只有 python 2.7

Question

我是 python 的新手，我刚刚安装了 python 3.7.2，至少我的 IDLE 是这样告诉我的。但是，当我检查 usr/bin 时，我只看到 python2.7。这是为什么？怎么回事？

提前致谢！

P.S.: 这是第一次也是唯一一次 python 我的机器看到了，我很确定。

系统：IOS v.10.13.6

Answer 1

现在，MAC OS X 预装了 python2，他们可以通过放置它来使用它在 /usr/local/bin 中并且此位置已经在 System PATH.

中

如果您安装 Python3+ 之类的任何新版本，它将安装在 /Library/Frameworks/Python.framework/Versions/<version>/bin/ 上。

例如在我的例子中，完整路径是 /Library/Frameworks/Python.framework/Versions/3.6/bin/python3 & /Library/Frameworks/Python.framework/Versions/3.6/bin/python3.6。

我已经使用 Homebrew.

安装了 Python3.6

以下是我的终端的有用日志。请看一下。

» Versions check with path (which python)

Rishikeshs-MacBook-Air:~ hygull$ which python
/usr/local/bin/python
Rishikeshs-MacBook-Air:~ hygull$

which python3

Rishikeshs-MacBook-Air:~ hygull$ which python3
/Library/Frameworks/Python.framework/Versions/3.6/bin/python3
Rishikeshs-MacBook-Air:~ hygull$

which python3.6

Rishikeshs-MacBook-Air:~ hygull$ which python3.6
/Library/Frameworks/Python.framework/Versions/3.6/bin/python3.6
Rishikeshs-MacBook-Air:~ hygull$

» Start & exit (python2, default installation on MAC OS X)

python

Rishikeshs-MacBook-Air:~ hygull$ python
Python 2.7.15 (default, Jan 12 2019, 21:07:57) 
[GCC 4.2.1 Compatible Apple LLVM 10.0.0 (clang-1000.11.45.5)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> 
>>> exit()
Rishikeshs-MacBook-Air:~ hygull$

python3

Rishikeshs-MacBook-Air:~ hygull$ python3
Python 3.6.7 (v3.6.7:6ec5cf24b7, Oct 20 2018, 03:02:14) 
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> 
>>> exit()
Rishikeshs-MacBook-Air:~ hygull$

python3.6

(Same as above but useful if you have two python3+, e.g. if you have python3.6 & python3.7 installed & you want to work with python3.6)

Rishikeshs-MacBook-Air:~ hygull$ python3.6
Python 3.6.7 (v3.6.7:6ec5cf24b7, Oct 20 2018, 03:02:14) 
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>>

安装后 python 3.7.2 usr/bin 只有 python 2.7

After installing python 3.7.2 usr/bin has only python 2.7

python

installation

python-2.7

python-3.7