File: cache-packages.py

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python-apt 3.1.0
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#!/usr/bin/python3
"""Example for packages. Print all essential and important packages"""

import apt_pkg


def main():
    """Main."""
    apt_pkg.init_config()
    apt_pkg.init_system()
    cache = apt_pkg.Cache()
    print("Essential packages:")
    for pkg in cache.packages:
        if pkg.essential:
            print(" ", pkg.name)
    print("Important packages:")
    for pkg in cache.packages:
        if pkg.important:
            print(" ", pkg.name)


if __name__ == "__main__":
    main()