pip install cffi==1.15.0

Foreign Function Interface for Python calling C code.

Source
Among top 100 packages on PyPI.
Over 233.9M downloads in the last 90 days.

Commonly used with cffi

Based on how often these packages appear together in public requirements.txt files on GitHub.

pycparser

C parser in Python

cryptography

cryptography is a package which provides cryptographic recipes and primitives to Python developers.

ipaddress

IPv4/IPv6 manipulation library

asn1crypto

Fast ASN.1 parser and serializer with definitions for private keys, public keys, certificates, CRL, OCSP, CMS, PKCS#3, PKCS#7, PKCS#8, PKCS#12, PKCS#5, X.509 and TSP

enum34

Python 3.4 Enum backported to 3.3, 3.2, 3.1, 2.7, 2.6, 2.5, and 2.4

pynos

Brocade NOS Library.

metrology

A library to easily measure what\'s going on in your python.

cargo

Dependency injection library for Python.

fernet

A simple python fernet implementation

eccsnacks

Reference implementation of Curve25519 and Curve448 (goldilocks) as specified in RFC7748

curve25519-donna

Python wrapper for the Curve25519 cryptographic library

ndg-httpsclient

Provides enhanced HTTPS support for httplib and urllib2 using PyOpenSSL

python-cachetclient

A client and library for the Cachet administrative interface

easyhid

A simple interface to the HIDAPI library.

b2

Command Line Tool for Backblaze B2

pyOpenSSL

Python wrapper module around the OpenSSL library

StudDP

StudIP file downloader in python

pywinrm2

Python library for Windows Remote Management

ansible-review

reviews ansible playbooks, roles and inventory and suggests improvements

Version usage of cffi

Proportion of downloaded versions in the last 3 months (only versions over 1%).

1.14.6

53.72%

1.15.0

20.08%

1.14.5

11.35%

1.13.2

4.56%

1.14.0

2.24%

1.14.4

2.07%

1.14.3

1.66%