func.py 文件源码

def smart_str(s, encoding='utf-8', strings_only=False, errors='strict'):  
    if strings_only and isinstance(s, (types.NoneType, int)):  
        return s  
    if not isinstance(s, basestring):  
        try:  
            return str(s)  
        except UnicodeEncodeError:  
            if isinstance(s, Exception):  
                return ' '.join([smart_str(arg, encoding, strings_only,  
                        errors) for arg in s])  
            return unicode(s).encode(encoding, errors)  
    elif isinstance(s, unicode):  
        return s.encode(encoding, errors)  
    elif s and encoding != 'utf-8':  
        return s.decode('utf-8', errors).encode(encoding, errors)  
    else:  
        return s