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  def func(a, b):
    print a or b
func(None, 'q')
func(123, 10)
func([1,2,3],'')
func('', {1: 5})
q
123
[1, 2, 3]
{1: 5}
 
  
  import subprocess
proc = subprocess.Popen(['ls','-la', some-other-args], stdout = subprocess.PIPE, stderr = subprocess.PIPE)
out, err = proc.communicate()