def freeze(bin_env=None,
           user=None,
           cwd=None,
           use_vt=False):
    pip_bin = _get_pip_bin(bin_env)

    cmd = [pip_bin, 'freeze']
    cmd_kwargs = dict(runas=user, cwd=cwd, use_vt=use_vt, python_shell=False)
    if bin_env and os.path.isdir(bin_env):
        cmd_kwargs['env'] = {'VIRTUAL_ENV': bin_env}
    result = __salt__['cmd.run_all'](cmd, **cmd_kwargs)

    if result['retcode'] > 0:
        raise CommandExecutionError(result['stderr'])

    return result['stdout'].splitlines()
mask a collection of sequences.
dataset/ETHPy150Open saltstack/salt/salt/modules/pip.py/freeze--crossover with--dataset/ETHPy150Open CGATOxford/cgat/CGAT/Masker.py/Masker.maskSequences