subprocess wildcard usage

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You need to supply shell=True to execute the command through a shell interpreter.
If you do that however, you can no longer supply a list as the first argument, because the arguments will get quoted then. Instead, specify the raw commandline as you want it to be passed to the shell:

 proc = subprocess.Popen('ls *.bc', shell=True,
                                    stdout=subprocess.PIPE,
                                    stderr=subprocess.PIPE)

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