If there is not a directory, how can I disable the message? python

Question

If for example I was using the following code to open an application:

import os
os.system("open /Applications/IAmAnApp.app")

But if there is no such application such as IAmAnApp, it will display this message:

The file /Users/Username/Desktop/Python/iamanapp does not exist.

I tried using try then except, but it's not an error, just a message.

How can I disable this message and just let the code continue?

Check to see if it exists first: http://stackoverflow.com/q/82831/535275 — Scott Hunter, Aug 10 '14 at 22:25

score 0 · Accepted Answer · answered Aug 10 '14 at 22:25

0

If this is a message printed by open (whatever this command is), how about testing for file existence before?

os.system("test -f /Applications/IAmAnApp.app && open /Applications/IAmAnApp.app")

answered Aug 10 '14 at 22:25

adl

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Thanks! Wow, I feel dumb I didn't think of that! – user3875728 Aug 10 '14 at 22:29

score 0 · Answer 2 · answered Aug 10 '14 at 22:25

0

import subprocess
try:
    subprocess.call(["open /Applications/IAmAnApp.app"])
except OSError:
    dosomething_else

answered Aug 10 '14 at 22:25

petkostas

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Thank you! I would've used that except I was trying to teach my friend about the open command using import os. I should've been more clear about that! – user3875728 Aug 10 '14 at 22:28

score 0 · Answer 3 · answered Aug 10 '14 at 22:29

0

You could use a shell to redirect the output.

os.system('bash -c "open /Applications/IAmAnApp.app &> /dev/null"')

answered Aug 10 '14 at 22:29

Chris Martin

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score 0 · Answer 4 · answered Aug 10 '14 at 22:29

Here's a quick and easy method: use os.path.isdir to detect the presence of the app. Here’s an example:

import os

app_path = os.path.join('/Applications', 'Safari.app')
if os.path.isdir(app_path):
    print 'installed!'
else:
    print 'not installed!'

Note that you have to use isdir, not isfile, because OS X .app bundles are really directories that get special treatment from the Finder. This also seems to work for symlinks, but I don’t know how it would work for aliases.

score 0 · Answer 5 · answered Aug 10 '14 at 22:29

0

You should use the subprocess module which is intended to replace os.system:

import subprocess
subprocess.Popen(['open', '/Applications/IAmAnApp.app'],
    stderr=subprocess.STDOUT, stdout=subprocess.PIPE)

answered Aug 10 '14 at 22:29

enrico.bacis

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If there is not a directory, how can I disable the message? python

5 Answers5