where, which, executable_exists #python.shellutils

where.py

# [pyperclip/__init__.py at master · asweigart/pyperclip](https://github.com/asweigart/pyperclip/blob/master/src/pyperclip/__init__.py)

try:
    from shutil import which as _executable_exists
except ImportError:
    # The "which" unix command finds where a command is.
    if platform.system() == 'Windows':
        WHICH_CMD = 'where'
    else:
        WHICH_CMD = 'which'

    def _executable_exists(name):
        return subprocess.call([WHICH_CMD, name],
                            stdout=subprocess.PIPE, stderr=subprocess.PIPE) == 0