ImportError: No module named 'Crypto'

Question

I am working with pycrypto. It works fine on my local windows machine, but when I move it to my python box I get an error with importing the module:

from Crypto.Cipher import ARC4 
ImportError: No module named 'Crypto'

The output of python3.3 -c "from Crypto.Cipher import ARC4"

Traceback (most recent call last):
  File "<string>", line 1, in <module>
ImportError: No module named 'Crypto'

output of pip3 list has a reference includes pycrypto (2.6.1)

I know it works with Python 2.7.6, but I wrote the script in 3.3 so it depends on some things from 3.3

what is your python box? You have actually installed all the packages for python3 on your box also? — Padraic Cunningham, Feb 05 '15 at 22:36
the box is running Ubuntu 14.04 x64. I added the package with pip3 on both my local machine and the box. — crobject, Feb 05 '15 at 22:49
when you try `pip3 install pycrypto ` what do you see in the output, in specific the directory listed — Padraic Cunningham, Feb 05 '15 at 22:52
OK, I think I figured it out, pip installed the pycryto module to the python3.4 directory. I copied the folders over to 3.3 and it is working now. Thank you for the help =) — crobject, Feb 05 '15 at 23:09
No worries, I would use python3.4 myself unless you have a good reason not to — Padraic Cunningham, Feb 05 '15 at 23:11

score 10 · Answer 1 · answered Sep 24 '19 at 09:58

10

As I already wrote in this answer:

WARNING: Don't use `pycrypto` anymore!

Use pycryptodome instead, via pip3 install pycryptodome.

But make sure that you don't have pycrypto installed, because both packages install under the same folder Crypto.

answered Sep 24 '19 at 09:58

winklerrr

What is the reasoning for abandoning the use of `pycrypto`? – sherrellbc Mar 12 '21 at 18:28
1

The original reason for this post (an unsolved CVE) has been solved, so it is now safe to use pycrypto again. – Ben Carlsson May 27 '21 at 22:41

score 3 · Accepted Answer · answered Feb 05 '15 at 23:03

3

I am assuming that your "python box" is a remote computer.

First, make sure pycrypto is up to date (pip3 install --upgrade pycrypto). The older versions may not be compatible with python 3.3

If that doesn't work, try looking in site-packages (the directory) to make sure the functions actually exist.

If none of that works, it might be easier (just a suggestion) to use from future import the things you need. That way it is python 2&3 compatible.

answered Feb 05 '15 at 23:03

IronManMark20

Thanks for your comment, I got it sorted out by copying the folder in site-packages from my 3.4 location to the 3.3 one. – crobject Feb 05 '15 at 23:49
It couldn't work with python 3.6.1 I have no idea why? – Ryan Chou Mar 28 '18 at 02:50
@RyanChou you probably want to use cryptography https://pypi.org/project/cryptography/ instead, I think PyCrypto is defunct (hasn't seen work since 2014). – IronManMark20 Apr 23 '18 at 21:51
@IronManMark20 OK, I got it. – Ryan Chou Apr 24 '18 at 11:11