Das deutsche Python-Forum

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import os

def which(command):
    basedirs = os.getenv('PATH', '').split(os.pathsep)
    for basedir in basedirs:
        path = os.path.join(basedir, command)
        if os.path.isfile(path) and os.access(path, os.X_OK):
            return path

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if subprocess.call(["wich", command) == 1:
   print "Kommando", command, "existiert nicht"

Code: Alles auswählen

def is_command(command):
    return all(s not in command for s in filter(None, (os.sep, os.altsep)))

def resolve_command(command):
    if not is_command(command):
         raise ValueError(command)
    directories = (d or os.getcwd() for d in os.environ['PATH'].split(os.pathsep))
    candidates = (os.path.join(d, command) for d in directories)
    executables = (c for c in candidates if os.path.isfile(c) and os.access(c, os.X_OK))
    executable = next(executables, None)
    if not executable:
         raise LookupError(command)
    else:
         return command

def find_executable(command):
     if is_command(command):
           return resolve_command(command)
     else:
           return os.path.abspath(command)