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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()
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