安装python模块ImportError（dlib，imutils）raspberry pi

Question

I am trying to install dlib on my raspberry py for a computer vision project with opencv. I installed successfully opencv, and I can import cv2 module in python.

    $ python
>>> import cv2
>>> cv2.__version__
'3.3.0'
>>>

Then I installed 2 modules with pip install: dlib and imutils. I can see them in pip freeze:

$ pip freeze | grep dlib
dlib==19.10.0
$ pip freeze | grep imutils
imutils==0.4.6

But the problem is that in python i can't import them, python does not find them and I can't use them.

>>> import dlib
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named dlib
>>> import imutils
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named imutils

How can I fix this problem?

Edit: @hoefling

$ python -c "import os, sys; print(os.linesep.join(sys.path))"

/usr/lib/python2.7
/usr/lib/python2.7/plat-arm-linux-gnueabihf
/usr/lib/python2.7/lib-tk
/usr/lib/python2.7/lib-old
/usr/lib/python2.7/lib-dynload
/usr/local/lib/python2.7/dist-packages
/usr/lib/python2.7/dist-packages
/usr/lib/python2.7/dist-packages/gtk-2.0

$ pip -V
pip 10.0.0 from /usr/local/lib/python3.5/dist-packages/pip (python 3.5)

Answer 1

I installed imutils with

sudo pip install imutils --target /usr/local/lib/python3.5/dist-packages/

into the python 3.5 folder and everything went right

Answer 2

就像评论中所说的hoefling一样，您可能安装了多个python版本，因为Rpi随附2和3。如果您使用的是Python 3，请使用pip3而不是pip。

Answer 3

Your system has pip symlinked to pip3 , so when you use pip , it installs packages for python3 . Use the pip2 to target pip for python2 :

$ pip2 install dlib imutils

It may be the case that you don't have pip installed for python2 . In this case, you have to install it separately. Judging by dist-packages in the sys.path , you have a debian or some derivative, so most probably you'll have to apt install python2-pip to add pip2 to the system.