安装numpy说它已经是最新版本了，它也显示在pip list返回的列表中，但导入它会导致导入错误（这个问题适用于所有其他已安装的模块，例如scipy， matplotlib）。
系统有什么问题以及解决方法？
sunny@sunny:~$ pip list
adium-theme-ubuntu (0.3.4)
cycler (0.9.0)
decorator (4.0.6)
matplotlib (1.5.1)
numpy (1.11.0)
Pillow (3.1.2)
pip (8.1.1)
pyeemd (1.3.1)
pyparsing (2.0.3)
python-dateutil (2.4.2)
pytz (2014.10)
scipy (0.17.0)
setuptools (20.7.0)
six (1.10.0)
unity-lens-photos (1.0)
wheel (0.29.0)
sunny@sunny:~$ python
Python 2.7.11 (default, May 28 2016, 17:16:00)
[GCC 5.3.1 20160413] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: No module named numpy
>>> quit()
sunny@sunny:~$ sudo apt-get install python-numpy
Reading package lists... Done
Building dependency tree
Reading state information... Done
python-numpy is already the newest version (1:1.11.0-1ubuntu1).
0 upgraded, 0 newly installed, 0 to remove and 5 not upgraded.
sunny@sunny:~$
编辑：我试图在我的Ubuntu系统上使用pip3 for python3来使导入工作（之前我从未接触过python3），我再次得到与上面相同的旧结果，这是< / p>
sunny@sunny:~$ pip3 install numpy
Collecting numpy
Downloading numpy-1.11.1-cp35-cp35m-manylinux1_x86_64.whl (15.6MB)
100% |████████████████████████████████| 15.6MB 57kB/s
Installing collected packages: numpy
Successfully installed numpy
You are using pip version 8.1.1, however version 8.1.2 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
sunny@sunny:~$ python
Python 2.7.11 (default, May 28 2016, 17:16:00)
[GCC 5.3.1 20160413] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: No module named numpy
>>> quit()
sunny@sunny:~$ pip3 list
apturl (0.5.2)
beautifulsoup4 (4.4.1)
blinker (1.3)
Brlapi (0.6.4)
chardet (2.3.0)
checkbox-support (0.22)
command-not-found (0.3)
cryptography (1.2.3)
defer (1.0.6)
feedparser (5.1.3)
guacamole (0.9.2)
html5lib (0.999)
httplib2 (0.9.1)
idna (2.0)
Jinja2 (2.8)
language-selector (0.1)
louis (2.6.4)
lxml (3.5.0)
Mako (1.0.3)
MarkupSafe (0.23)
numpy (1.11.1)
oauthlib (1.0.3)
onboard (1.2.0)
padme (1.1.1)
pexpect (4.0.1)
Pillow (3.1.2)
pip (8.1.1)
plainbox (0.25)
ptyprocess (0.5)
pyasn1 (0.1.9)
pycups (1.9.73)
pycurl (7.43.0)
pygobject (3.20.0)
PyJWT (1.3.0)
pyparsing (2.0.3)
python-apt (1.1.0b1)
python-debian (0.1.27)
python-systemd (231)
pyxdg (0.25)
reportlab (3.3.0)
requests (2.9.1)
sessioninstaller (0.0.0)
setuptools (20.7.0)
six (1.10.0)
system-service (0.3)
ubuntu-drivers-common (0.0.0)
ufw (0.35)
unattended-upgrades (0.1)
unity-scope-calculator (0.1)
unity-scope-chromiumbookmarks (0.1)
unity-scope-colourlovers (0.1)
unity-scope-devhelp (0.1)
unity-scope-firefoxbookmarks (0.1)
unity-scope-gdrive (0.7)
unity-scope-manpages (0.1)
unity-scope-openclipart (0.1)
unity-scope-texdoc (0.1)
unity-scope-tomboy (0.1)
unity-scope-virtualbox (0.1)
unity-scope-yelp (0.1)
unity-scope-zotero (0.1)
urllib3 (1.13.1)
usb-creator (0.3.0)
wheel (0.29.0)
xdiagnose (3.8.4)
xkit (0.0.0)
XlsxWriter (0.7.3)
You are using pip version 8.1.1, however version 8.1.2 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
sunny@sunny:~$
答案 0 :(得分：0)
你为python3.5。*安装了numpy，但你在python2.7.11中导入它。不是吗？
sunny@sunny:~$ pip3 install numpy
Collecting numpy
Downloading numpy-1.11.1-cp35-cp35m-manylinux1_x86_64.whl (15.6MB)
100% |████████████████████████████████| 15.6MB 57kB/s
Installing collected packages: numpy
Successfully installed numpy
＆＃34; CP35＆＃34;在名称＆＃34; numpy-1.11.1-cp35-cp35m-manylinux1_x86_64.whl＆＃34;意思是python3.5。*。
sunny@sunny:~$ python
Python 2.7.11 (default, May 28 2016, 17:16:00)
[GCC 5.3.1 20160413] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: No module named numpy
但是在这里，你输入＆＃34; python＆＃34;，然后打开python2.7.11而不是python3.5。*。 所以试试＆＃34; cd＆＃34;到python3.5。*的安装目录，然后输入＆＃34; python3.5.exe＆＃34;。 希望能帮到你。