utils.py 文件源码

def safestr(obj, encoding='utf-8'):
    r"""
    Converts any given object to utf-8 encoded string. 

        >>> safestr('hello')
        'hello'
        >>> safestr(u'\u1234')
        '\xe1\x88\xb4'
        >>> safestr(2)
        '2'
    """
    if isinstance(obj, unicode):
        return obj.encode(encoding)
    elif isinstance(obj, str):
        return obj
    elif hasattr(obj, 'next'): # iterator
        return itertools.imap(safestr, obj)
    else:
        return str(obj)

# for backward-compatibility