ImportError: No module named Crypto.Cipher

Question

When I try to run app.py (Python 3.3, PyCrypto 2.6) my virtualenv keeps returning the error listed above. My import statement is just from Crypto.Cipher import AES. I looked for duplicates and you might say that there are some, but I tried the solutions (although most are not even solutions) and nothing worked.

You can see what the files are like for PyCrypto below:

Answer 1

I solve this problem by change the first letter case to upper. Make sure ''from Crypto.Cipher import AES'' not ''from crypto.Cipher import AES''.

Answer 2

For CentOS 7.4 I first installed pip and then pycrypto using pip:

> sudo yum -y install python-pip 
> sudo python -m pip install pycrypto

Answer 3

This problem can be fixed by installing the C++ compiler (python27 or python26). Download it from Microsoft https://www.microsoft.com/en-us/download/details.aspx?id=44266 and re-run the command : pip install pycrypto to run the gui web access when you kill the process of easy_install.exe.

Answer 4

Worked for me (Ubuntu 17.10)

Removing venv and creating it again with python v3.6

pip3 install PyJWT
sudo apt-get install build-essential libgmp3-dev python3-dev
pip3 install cryptography
pip3 install pycryptodome
pip3 install pycryptodomex

Pycrypto is deprecated, had problems with it, used Pycryptodome

Answer 5

I found the solution. Issue is probably in case sensitivity (on Windows).

Just change the name of the folder:

• C:\Python27\Lib\site-packages\crypto
• to: C:\Python27\Lib\site-packages\Crypto

This is how folder was named after installation of pycrypto:

I've changed it to:

And now the following code works fine:

Answer 6

I had the same problem (though on Linux). The solution was quite simple - add:

libraries:
- name: pycrypto
  version: "2.6"

to my app.yaml file. Since this worked correctly in the past, I assume this is a new requirement.