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copied!<p>That's because subprocess doesn't load a shell by default (see <a href="http://docs.python.org/2/library/subprocess.html#subprocess.check_call" rel="nofollow">the docs</a>), so it doesn't get what's in your .bash_profile. Use this:</p> <pre><code>subprocess.check_call(args = ["python3.3", onePyFile], shell=True) </code></pre> <p>Edit: Seems like glasslion was faster than me!</p> <p>Edit 2: I did a bit more digging around, and found something strange. Because shell=True didn't seem to work as expected I went with a more direct approach, calling bash directly.</p> <p>a.py:</p> <pre><code>from subprocess import check_call check_call(['bash', '-c', '. ~/.bash_profile && ABC a bc']) </code></pre> <p>a.sh (what would be your python3 executable):</p> <pre><code>echo $* </code></pre> <p>I first tried with <code>alias ABC='~/Documents/a.sh'</code> in <code>.bash_profile</code>:</p> <pre><code>$ python ~/Documents/a.py bash: ABC: command not found Traceback (most recent call last): File "Documents/a.py", line 6, in <module> check_call(['bash', '-c', '. ' + expanduser('~/.bash_profile') + ' && ABC a bc']) File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 511, in check_call subprocess.CalledProcessError: Command '['bash', '-c', '. ~/.bash_profile && ABC a bc']' returned non-zero exit status 127 </code></pre> <p>Then I switched from an alias to a function: <code>ABC() { ~/Documents/a.sh $*; }</code> And it worked!</p> <pre><code>$ python ~/Documents/a.py a bc </code></pre> <p>Bottom line is I got it to work, but I don't know why! Shells aren't reliable, so the best would be to skip the shell.</p> <p>We can do that by using the shebang's principle (as Fred Mitchell suggested) in a clever way:</p> <pre><code>from subprocess import check_call check_call(['/usr/bin/env', 'python3', onePyFile]) </code></pre> <p>This will work if Python 3 was installed correctly, independently of it's path (what I suppose you wanted to achieve).</p>

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