OK I think I found my error, here is what I did:
flags = set([file for file in glob.glob('flag-*.svg')])
def call(cmd):
subprocess.call([cmd], shell=True)
for flag in flags:
name = flag[:-4]
out = name+'.png'
call('svg2png --width=17 --height=12 %s %s' \
% (flag, out))
Is this better?
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