import subprocess
proc = subprocess.Popen(['ls', '/404'], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
stdout,stderr = proc.communicate()
aW1wb3J0IHN1YnByb2Nlc3MKcHJvYyA9IHN1YnByb2Nlc3MuUG9wZW4oWydscycsICcvNDA0J10sIHN0ZG91dD1zdWJwcm9jZXNzLlBJUEUsIHN0ZGVycj1zdWJwcm9jZXNzLlNURE9VVCkKc3Rkb3V0LHN0ZGVyciA9IHByb2MuY29tbXVuaWNhdGUoKQ==