command execute directory

i have to execute a command use python subprocess .

by default , command is execute as working on the directory where the pytho开发者_JAVA百科n script file is . such as

 subprocess.Popen(shlex.split("ls -l"))

will list the file in the directory of the script file where is .

but i want this command to execute in another directory ,say , B . how can i do it .

i try this , but faild:

env['PWD'] = "/data/a"
f = tempfile.TemporaryFile('w+b')
p = subprocess.Popen(shlex.split(cmd),stdout= f,stderr=f,env=env)

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You can use os.chdir or you use the cwd parameter to Popen.

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ls -l list all items in current directory default. You could tell command ls -l which directory to list by using ls -l /your-path

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hi did u try changing the unix command

ls -l 

to something like

ls -l /usr/share;