listPkgs.py

#!/usr/bin/env python

# listPkgs.py

import json
import sys
import subprocess
import re

def safe_str(obj):
    try:
        return str(obj)
    except UnicodeEncodeError:
        return obj.encode('ascii', 'ignore').decode('ascii')
    return ''

def listPkgs():
    req = subprocess.Popen( 
        ('dpkg', '-l'),
        stdout=subprocess.PIPE)
    
    res = subprocess.check_output( 
        ('grep', '^ii'), 
        stdin=req.stdout)
    req.wait()

    lines = safe_str(res).split('\\n')
    
    i = 0
    while len([l for l in re.split(" {2,}", lines [i]) if l]) != 5:
        i += 1

    pkgs = []
    for line in lines:
        parsed_line = re.split(r" {2,}", line)
        if (len(parsed_line) == 5) and (len (parsed_line [1]) > 0): 
            pkgs.append({
                'State': parsed_line[0], 
                'Package': parsed_line [1], 
                'Version':parsed_line [2], 
                'Architecture': parsed_line [3], 
                'Description': parsed_line [4],
            })
    return pkgs

def listPkgsFilter(filt=[]):
    pkgs = listPkgs()
    res = []
    for p in pkgs:
        for f in filt:
            if 'Package' in p and f in p['package']: 
                res.append(p)
    
    return res

if __name__ == "__main__":
    print('listPkgs() ...............................')
    res = listPkgs()
    print(json.dumps (res, indent=2, sort_keys=True))
    print('listPkgsFilter() .........................')
    res = listPkgsFilter(filt=['uplynk'])
    print(json.dumps (res, indent=2, sort_keys=True))