functions check architecture of target python

def check_python_architecture(pythondir, target_arch_str):
    """
    functions check architecture of target python
    """
    pyth_str = subprocess.check_output(
        [pythondir + 'python', '-c',
         'import platform; print platform.architecture()[0]'])
    if pyth_str[:2] != target_arch_str:
        raise Exception(
            "Wrong architecture of target python. Expected arch is"
            + target_arch_str)