pip install pycrypto==2.6.1

Cryptographic modules for Python.

Source
Among top 1000 packages on PyPI.
Over 11.4M downloads in the last 90 days.

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

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Version usage of pycrypto

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

2.6.1

99.06%