File: free.py

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#!/usr/bin/env python3

# Copyright (c) 2009, Giampaolo Rodola'. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""
A clone of 'free' cmdline utility.

$ python scripts/free.py
             total       used       free     shared    buffers      cache
Mem:      10125520    8625996    1499524          0     349500    3307836
Swap:            0          0          0
"""

import psutil


def main():
    virt = psutil.virtual_memory()
    swap = psutil.swap_memory()
    templ = "%-7s %10s %10s %10s %10s %10s %10s"
    print(templ % ('', 'total', 'used', 'free', 'shared', 'buffers', 'cache'))
    print(templ % (
        'Mem:',
        int(virt.total / 1024),
        int(virt.used / 1024),
        int(virt.free / 1024),
        int(getattr(virt, 'shared', 0) / 1024),
        int(getattr(virt, 'buffers', 0) / 1024),
        int(getattr(virt, 'cached', 0) / 1024)))
    print(templ % (
        'Swap:', int(swap.total / 1024),
        int(swap.used / 1024),
        int(swap.free / 1024),
        '',
        '',
        ''))


if __name__ == '__main__':
    main()