Question

在Mac上，试图安装Python 3.6。

Sams-MacBook-Pro:~ samgreenberg$ which pip3
/Library/Frameworks/Python.framework/Versions/3.6/bin/pip3
Sams-MacBook-Pro:~ samgreenberg$ which python3
/Library/Frameworks/Python.framework/Versions/3.6/bin/python3

然后

Sams-MacBook-Pro:~ samgreenberg$ pip3 list
DEPRECATION: The default format will switch to columns in the future. 

You can use --format=(legacy|columns) (or define a format=(legacy|columns) in your pip.conf under the [list] section) to disable this warning.
biopython (1.70)
certifi (2017.7.27.1)
chardet (3.0.4)
cycler (0.10.0)
decorator (4.1.2)
idna (2.6)
ipython-genutils (0.2.0)
jsonschema (2.6.0)
jupyter-core (4.3.0)
matplotlib (2.0.2)
nbformat (4.4.0)
numpy (1.13.1)
olefile (0.44)
Pillow (4.3.0)
pip (9.0.1)
plotly (2.0.15)
pyparsing (2.2.0)
python-dateutil (2.6.1)
pytz (2017.2)
requests (2.18.4)
setuptools (28.8.0)
six (1.10.0)
traitlets (4.3.2)
urllib3 (1.22)

所以似乎已经安装了biopython

Sams-MacBook-Pro:~ samgreenberg$ python3 -m pip install biopython
Requirement already satisfied: biopython in /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages
Requirement already satisfied: numpy in /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages (from biopython)

绝对安装。

Sams-MacBook-Pro:~ samgreenberg$ python3
Python 3.6.2 (v3.6.2:5fd33b5926, Jul 16 2017, 20:11:06) 
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import urllib3
>>> import biopython
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'biopython'
>>>

urllib3有效，但不是新安装的包。使用pip卸载并重新安装没有任何效果，当我尝试使用随机的其他软件包时，结果相同。我究竟做错了什么？我对Python或OSX并不是特别熟悉。我的计算机预装了Python 2.7，但我在命令中小心使用Python3。

Answer 1

当我们使用一些python模块时，我们通常会写>>> import module。例如，>>> import urllib3。但是，包括biopython在内的一些软件包已不符合此规则。您尝试输入>>> import Bio和>>> print(Bio.__version__)。请在http://biopython.org/DIST/docs/tutorial/Tutorial.html查看更多详情。

- 原始答案 -

~~请尝试键入以下脚本：~~

>>import sys >>print(sys.path)

我认为只有/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages只有python2的模块路径。

如果您想暂时解决此问题，请使用以下内容：

>>sys.path.append("/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages")

请在PYTHONPATH中定义~/.bash_profile，如果您始终使用python3，请重新启动终端：

PYTHONPATH=/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages:$PYTHONPATH

<击>

Python无法找到使用pip安装的软件包

1 个答案: