List processes, sort by memory usage, group by image name on Windows

taskmem.py

# Tested on Windows 7~, Python 2.7 and 3.6.
#
# -*- coding: utf-8 -*-

import subprocess
import operator


res = subprocess.check_output(['tasklist'])
res = res.split(b'\r\n')[2:]

title = res[0].split()
image_width = len(title[0])
mem_width = len(title[-1])

stat = {}
for line in res[1:]:
    imagename = line[:image_width].strip()
    try:
        mem = int(line[-mem_width:].replace(b',', b'').replace(b'K', b'') \
            .strip())
    except:
        continue

    if imagename not in stat:
        stat[imagename] = 0

    stat[imagename] += mem


sorted_stat = sorted(stat.items(), key=operator.itemgetter(1))[::-1]
mem_width = max(len(str(sorted_stat[0][1])), 6)
print_fmt = '%-'+str(image_width)+'s %'+str(mem_width)+'s'

print(print_fmt % ('ImageName', 'Memory'.ljust(mem_width)))
print('='*image_width + ' ' + '='*mem_width)
for i, m in sorted_stat:
    print(print_fmt % (i.decode('utf-8'), m))

Example output:

λ python taskmem.py              
ImageName                 Memory 
========================= =======
vmware-vmx.exe            1994628
slack.exe                 1909280
chrome.exe                1849452
Memory Compression        1164568
svchost.exe                469672
explorer.exe               272164
CefSharp.BrowserSubproces  189692
Everything.exe             174404
devenv.exe                 174260
primegrid_cllr.exe         166800
Mailbird.exe               128320

(snip)