human
Solve the following python programming problem given the following code:
def _format_usage(self, usage, actions, groups, prefix) : 
    if (prefix is None) : 
        prefix = _ ('usage: ') 
if (usage is not None) : 
        usage = (usage % dict (prog = self._prog)) 
else : 
        if ((usage is None) and (not actions)) : 
            usage = ('%(prog)s' % dict (prog = self._prog)) 
else : 
            if (usage is None) : 
                prog = ('%(prog)s' % dict (prog = self._prog)) 
                optionals = [] 
                positionals = [] 
                for action in actions : 
                    if action.option_strings : 
                        optionals.append (action) 
else : 
                        positionals.append (action) 
format = self._format_actions_usage 
                action_usage = format ((optionals + positionals), groups) 
                usage = ' '.join ([s for s in [prog, action_usage] if s]) 
                text_width = (self._width - self._current_indent) 
                if ((len (prefix) + len (usage)) > text_width) : 
                    part_regexp = '\\(.*?\\)+|\\[.*?\\]+|\\S+' 
                    opt_usage = format (optionals, groups) 
                    pos_usage = format (positionals, groups) 
                    opt_parts = _re.findall (part_regexp, pos_usage) 
                    pos_parts = _re.findall (part_regexp, pos_usage) 
                    assert (' '.join (opt_parts) == opt_usage) 
                    assert (' '.join (pos_parts) == pos_usage) 
                    def get_lines(parts, indent, prefix = None) : 
                        lines = [] 
                        line = [] 
                        if (prefix is not None) : 
                            line_len = (len (prefix) - 1) 
else : 
                            line_len = (len (indent) - 1) 
for part in parts : 
                            if (((line_len + 1) + len (part)) > text_width) : 
                                lines.append ((indent + ' '.join (line))) 
                                line = [] 
                                line_len = (len...

    
    

    Fix the buggy line: opt_parts = _re.findall (part_regexp, pos_usage)
assistant
#Here is Python program to fix the buggy line: opt_parts = _re.

opt_parts = _re.findall (part_regexp, opt_usage)