# path – Test if executable exists in Python?

## The Question :

311 people think this question is useful

In Python, is there a portable and simple way to test if an executable program exists?

By simple I mean something like the which command which would be just perfect. I don’t want to search PATH manually or something involving trying to execute it with Popen & al and see if it fails (that’s what I’m doing now, but imagine it’s launchmissiles)

• What’s wrong with searching the PATH environment variable? What do you think the UNIX ‘which’ command does?
• Is which.py script from stdlib a simple way?
• @J.F. – the which.py script incl. with Python depends on ‘ls’ and some of the other comments indicate that Piotr was looking for a cross-platform answer.
• @Jay: Thanks for the comment. I has coreutils installed on Windows so I didn’t notice that which.py is unix-specific.
• There is also which, the third-party module: code.activestate.com/pypm/which

327 people think this answer is useful

Easiest way I can think of:

def which(program):
import os
def is_exe(fpath):
return os.path.isfile(fpath) and os.access(fpath, os.X_OK)

fpath, fname = os.path.split(program)
if fpath:
if is_exe(program):
return program
else:
for path in os.environ["PATH"].split(os.pathsep):
exe_file = os.path.join(path, program)
if is_exe(exe_file):
return exe_file

return None



Edit: Updated code sample to include logic for handling case where provided argument is already a full path to the executable, i.e. “which /bin/ls”. This mimics the behavior of the UNIX ‘which’ command.

Edit: path.strip('"') seems like the wrong thing to do here. Neither Windows nor POSIX appear to encourage quoted PATH items.

343 people think this answer is useful

I know this is an ancient question, but you can use distutils.spawn.find_executable. This has been documented since python 2.4 and has existed since python 1.6.

import distutils.spawn



Also, Python 3.3 now offers shutil.which().

177 people think this answer is useful

Use shutil.which() from Python’s wonderful standard library. Batteries included!

44 people think this answer is useful

### For python 3.3 and later:

import shutil

command = 'ls'
shutil.which(command) is not None



As a one-liner of Jan-Philip Gehrcke Answer:

cmd_exists = lambda x: shutil.which(x) is not None



As a def:

def cmd_exists(cmd):
return shutil.which(cmd) is not None



### For python 3.2 and earlier:

my_command = 'ls'
any(
(
os.access(os.path.join(path, my_command), os.X_OK)
and os.path.isfile(os.path.join(path, my_command)
)
for path in os.environ["PATH"].split(os.pathsep)
)



This is a one-liner of Jay’s Answer, Also here as a lambda func:

cmd_exists = lambda x: any((os.access(os.path.join(path, x), os.X_OK) and os.path.isfile(os.path.join(path, x))) for path in os.environ["PATH"].split(os.pathsep))
cmd_exists('ls')



Or lastly, indented as a function:

def cmd_exists(cmd, path=None):
""" test if path contains an executable file with name
"""
if path is None:
path = os.environ["PATH"].split(os.pathsep)

for prefix in path:
filename = os.path.join(prefix, cmd)
executable = os.access(filename, os.X_OK)
is_not_directory = os.path.isfile(filename)
if executable and is_not_directory:
return True
return False



19 people think this answer is useful

Just remember to specify the file extension on windows. Otherwise, you have to write a much complicated is_exe for windows using PATHEXT environment variable. You may just want to use FindPath.

OTOH, why are you even bothering to search for the executable? The operating system will do it for you as part of popen call & will raise an exception if the executable is not found. All you need to do is catch the correct exception for given OS. Note that on Windows, subprocess.Popen(exe, shell=True) will fail silently if exe is not found.

Incorporating PATHEXT into the above implementation of which (in Jay’s answer):

def which(program):
def is_exe(fpath):
return os.path.exists(fpath) and os.access(fpath, os.X_OK) and os.path.isfile(fpath)

def ext_candidates(fpath):
yield fpath
for ext in os.environ.get("PATHEXT", "").split(os.pathsep):
yield fpath + ext

fpath, fname = os.path.split(program)
if fpath:
if is_exe(program):
return program
else:
for path in os.environ["PATH"].split(os.pathsep):
exe_file = os.path.join(path, program)
for candidate in ext_candidates(exe_file):
if is_exe(candidate):
return candidate

return None



14 people think this answer is useful

## For *nix platforms (Linux and OS X)

This seems to be working for me:

Edited to work on Linux, thanks to Mestreion

def cmd_exists(cmd):
return subprocess.call("type " + cmd, shell=True,
stdout=subprocess.PIPE, stderr=subprocess.PIPE) == 0



What we’re doing here is using the builtin command type and checking the exit code. If there’s no such command, type will exit with 1 (or a non-zero status code anyway).

The bit about stdout and stderr is just to silence the output of the type command, since we’re only interested in the exit status code.

Example usage:

>>> cmd_exists("jsmin")
True
>>> cmd_exists("cssmin")
False
>>> cmd_exists("ls")
True
>>> cmd_exists("dir")
False
>>> cmd_exists("node")
True
>>> cmd_exists("steam")
False



7 people think this answer is useful

See os.path module for some useful functions on pathnames. To check if an existing file is executable, use os.access(path, mode), with the os.X_OK mode.

os.X_OK

Value to include in the mode parameter of access() to determine if path can be executed.

EDIT: The suggested which() implementations are missing one clue – using os.path.join() to build full file names.

6 people think this answer is useful

On the basis that it is easier to ask forgiveness than permission (and, importantly, that the command is safe to run) I would just try to use it and catch the error (OSError in this case – I checked for file does not exist and file is not executable and they both give OSError).

It helps if the executable has something like a --version flag that is a quick no-op.

import subprocess
myexec = "python2.8"
try:
subprocess.call([myexec, '--version']
except OSError:



This is not a general solution, but will be the easiest way for a lot of use cases – those where the code needs to look for a single well known executable which is safe to run, or at least safe to run with a given flag.

5 people think this answer is useful

I know that I’m being a bit of a necromancer here, but I stumbled across this question and the accepted solution didn’t work for me for all cases Thought it might be useful to submit anyway. In particular, the “executable” mode detection, and the requirement of supplying the file extension. Furthermore, both python3.3’s shutil.which (uses PATHEXT) and python2.4+’s distutils.spawn.find_executable (just tries adding '.exe') only work in a subset of cases.

So I wrote a “super” version (based on the accepted answer, and the PATHEXT suggestion from Suraj). This version of which does the task a bit more thoroughly, and tries a series of “broadphase” breadth-first techniques first, and eventually tries more fine-grained searches over the PATH space:

import os
import sys
import stat
import tempfile

def is_case_sensitive_filesystem():
tmphandle, tmppath = tempfile.mkstemp()
is_insensitive = os.path.exists(tmppath.upper())
os.close(tmphandle)
os.remove(tmppath)
return not is_insensitive

_IS_CASE_SENSITIVE_FILESYSTEM = is_case_sensitive_filesystem()

def which(program, case_sensitive=_IS_CASE_SENSITIVE_FILESYSTEM):
""" Simulates unix which command. Returns absolute path if program found """
def is_exe(fpath):
""" Return true if fpath is a file we have access to that is executable """
accessmode = os.F_OK | os.X_OK
if os.path.exists(fpath) and os.access(fpath, accessmode) and not os.path.isdir(fpath):
filemode = os.stat(fpath).st_mode
ret = bool(filemode &amp; stat.S_IXUSR or filemode &amp; stat.S_IXGRP or filemode &amp; stat.S_IXOTH)
return ret

def list_file_exts(directory, search_filename=None, ignore_case=True):
""" Return list of (filename, extension) tuples which match the search_filename"""
if ignore_case:
search_filename = search_filename.lower()
for root, dirs, files in os.walk(path):
for f in files:
filename, extension = os.path.splitext(f)
if ignore_case:
filename = filename.lower()
if not search_filename or filename == search_filename:
yield (filename, extension)
break

fpath, fname = os.path.split(program)

# is a path: try direct program path
if fpath:
if is_exe(program):
return program
elif "win" in sys.platform:
# isnt a path: try fname in current directory on windows
if is_exe(fname):
return program

paths = [path.strip('"') for path in os.environ.get("PATH", "").split(os.pathsep)]
exe_exts = [ext for ext in os.environ.get("PATHEXT", "").split(os.pathsep)]
if not case_sensitive:
exe_exts = map(str.lower, exe_exts)

# try append program path per directory
for path in paths:
exe_file = os.path.join(path, program)
if is_exe(exe_file):
return exe_file

# try with known executable extensions per program path per directory
for path in paths:
filepath = os.path.join(path, program)
for extension in exe_exts:
exe_file = filepath+extension
if is_exe(exe_file):
return exe_file

# try search program name with "soft" extension search
if len(os.path.splitext(fname)[1]) == 0:
for path in paths:
file_exts = list_file_exts(path, fname, not case_sensitive)
for file_ext in file_exts:
filename = "".join(file_ext)
exe_file = os.path.join(path, filename)
if is_exe(exe_file):
return exe_file

return None



Usage looks like this:

>>> which.which("meld")
'C:\\Program Files (x86)\\Meld\\meld\\meld.exe'



The accepted solution did not work for me in this case, since there were files like meld.1, meld.ico, meld.doap, etc also in the directory, one of which were returned instead (presumably since lexicographically first) because the executable test in the accepted answer was incomplete and giving false positives.

2 people think this answer is useful

def which(program):
path_ext = [""];
ext_list = None

if sys.platform == "win32":
ext_list = [ext.lower() for ext in os.environ["PATHEXT"].split(";")]

def is_exe(fpath):
exe = os.path.isfile(fpath) and os.access(fpath, os.X_OK)
# search for executable under windows
if not exe:
if ext_list:
for ext in ext_list:
exe_path = "%s%s" % (fpath,ext)
if os.path.isfile(exe_path) and os.access(exe_path, os.X_OK):
path_ext[0] = ext
return True
return False
return exe

fpath, fname = os.path.split(program)

if fpath:
if is_exe(program):
return "%s%s" % (program, path_ext[0])
else:
for path in os.environ["PATH"].split(os.pathsep):
path = path.strip('"')
exe_file = os.path.join(path, program)
if is_exe(exe_file):
return "%s%s" % (exe_file, path_ext[0])
return None



1 people think this answer is useful

An important question is “Why do you need to test if executable exist?” Maybe you don’t? 😉

Recently I needed this functionality to launch viewer for PNG file. I wanted to iterate over some predefined viewers and run the first that exists. Fortunately, I came across os.startfile. It’s much better! Simple, portable and uses the default viewer on the system:

>>> os.startfile('yourfile.png')



Update: I was wrong about os.startfile being portable… It’s Windows only. On Mac you have to run open command. And xdg_open on Unix. There’s a Python issue on adding Mac and Unix support for os.startfile.

1 people think this answer is useful

This seems simple enough and works both in python 2 and 3

try: subprocess.check_output('which executable',shell=True)



1 people think this answer is useful

You can try the external lib called “sh” (http://amoffat.github.io/sh/).

import sh
print sh.which('ls')  # prints '/bin/ls' depending on your setup
print sh.which('xxx') # prints None



0 people think this answer is useful

So basically you want to find a file in mounted filesystem (not necessarily in PATH directories only) and check if it is executable. This translates to following plan:

• enumerate all files in locally mounted filesystems
• match results with name pattern
• for each file found check if it is executable

I’d say, doing this in a portable way will require lots of computing power and time. Is it really what you need?

There is a which.py script in a standard Python distribution (e.g. on Windows '\PythonXX\Tools\Scripts\which.py').
EDIT: which.py depends on ls therefore it is not cross-platform.