python验证文件是否可读可写

概述python验证文件是否可读可写

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# import python libsimport osdef is_writeable(path,check_parent=False):    '''    Check if a given path is writeable by the current user.    :param path: The path to check    :param check_parent: If the path to check does not exist,check for the           ability to write to the parent directory instead    :returns: True or False    '''    if os.access(path,os.F_OK) and os.access(path,os.W_OK):        # The path exists and is writeable        return True    if os.access(path,os.F_OK) and not os.access(path,os.W_OK):        # The path exists and is not writeable        return False    # The path does not exists or is not writeable    if check_parent is False:        # We're not allowed to check the parent directory of the provIDed path        return False    # Lets get the parent directory of the provIDed path    parent_dir = os.path.dirname(path)    if not os.access(parent_dir,os.F_OK):        # Parent directory does not exit        return False    # Finally,return if we're allowed to write in the parent directory of the    # provIDed path    return os.access(parent_dir,os.W_OK)def is_readable(path):    '''    Check if a given path is readable by the current user.    :param path: The path to check    :returns: True or False    '''    if os.access(path,os.R_OK):        # The path exists and is readable        return True    # The path does not exist    return False

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