'shlex' me ha salvado a menudo de estos errores.

import subprocess
import shlex

cmd = shlex.split('''convert -depth 8 -size{}x{} RGB:- 
/tmp/random.png'''.format(size, size))
result = subprocess.run(cmd, stdin=result.stdout, stdout=subprocess.PIPE)


--
Jordi Funollet Pujol
http://www.linkedin.com/in/jordifunollet

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