<p>참조 문제가 발생하는 경우에</p>
<p>리스트는 안뜨고, 일반 변수는 뜨는 이유는</p>
<p>리스트는 call by reference고, 일반 변수는 아니기 때문인건가요?&nbsp;</p>

<p>네 맞습니다. 좋은 질문이예요</p>
<p>아래에서 mutable한 자료구조는 항상 call by reference를 신경쓰셔야 합니다.</p>
<p>감사합니다.</p>
<p></p>
<table style="box-sizing: border-box; border-spacing: 0px; border-collapse: collapse; background-color: #ffffff; font-family: 'Malgun Gothic'; font-size: 14px; font-variant-ligatures: common-ligatures; width: 762px;">
<tbody style="box-sizing: border-box;">
<tr style="box-sizing: border-box;">
<th style="box-sizing: border-box; padding: 8px 12px; text-align: center; border-right: 1px solid #dcdcdc;">class</th>
<th style="box-sizing: border-box; padding: 8px 12px; text-align: center; border-right: 1px solid #dcdcdc;">설명</th>
<th style="box-sizing: border-box; padding: 8px 12px; text-align: center; border-right: 0px;">구분</th>
</tr>
<tr style="box-sizing: border-box;">
<td style="box-sizing: border-box; padding: 8px 12px; border-right: 1px solid #dcdcdc; border-top: 1px solid #dcdcdc;">list</td>
<td style="box-sizing: border-box; padding: 8px 12px; border-right: 1px solid #dcdcdc; border-top: 1px solid #dcdcdc;">mutable 한 순서가 있는 객체 집합</td>
<td style="box-sizing: border-box; padding: 8px 12px; border-right: 0px; border-top: 1px solid #dcdcdc;">mutable</td>
</tr>
<tr style="box-sizing: border-box;">
<td style="box-sizing: border-box; padding: 8px 12px; border-right: 1px solid #dcdcdc; border-top: 1px solid #dcdcdc;">set</td>
<td style="box-sizing: border-box; padding: 8px 12px; border-right: 1px solid #dcdcdc; border-top: 1px solid #dcdcdc;">mutable 한 순서가 없는 고유한 객체 집합</td>
<td style="box-sizing: border-box; padding: 8px 12px; border-right: 0px; border-top: 1px solid #dcdcdc;">mutable</td>
</tr>
<tr style="box-sizing: border-box;">
<td style="box-sizing: border-box; padding: 8px 12px; border-right: 1px solid #dcdcdc; border-top: 1px solid #dcdcdc;">dict</td>
<td style="box-sizing: border-box; padding: 8px 12px; border-right: 1px solid #dcdcdc; border-top: 1px solid #dcdcdc;">key와 value가 맵핑된 객체, 순서 없음</td>
<td style="box-sizing: border-box; padding: 8px 12px; border-right: 0px; border-top: 1px solid #dcdcdc;">mutable</td>
</tr>
<tr style="box-sizing: border-box;">
<td style="box-sizing: border-box; padding: 8px 12px; border-right: 1px solid #dcdcdc; border-top: 1px solid #dcdcdc;">bool</td>
<td style="box-sizing: border-box; padding: 8px 12px; border-right: 1px solid #dcdcdc; border-top: 1px solid #dcdcdc;">참,거짓</td>
<td style="box-sizing: border-box; padding: 8px 12px; border-right: 0px; border-top: 1px solid #dcdcdc;">immutable</td>
</tr>
<tr style="box-sizing: border-box;">
<td style="box-sizing: border-box; padding: 8px 12px; border-right: 1px solid #dcdcdc; border-top: 1px solid #dcdcdc;">int</td>
<td style="box-sizing: border-box; padding: 8px 12px; border-right: 1px solid #dcdcdc; border-top: 1px solid #dcdcdc;">정수</td>
<td style="box-sizing: border-box; padding: 8px 12px; border-right: 0px; border-top: 1px solid #dcdcdc;">immutable</td>
</tr>
<tr style="box-sizing: border-box;">
<td style="box-sizing: border-box; padding: 8px 12px; border-right: 1px solid #dcdcdc; border-top: 1px solid #dcdcdc;">float</td>
<td style="box-sizing: border-box; padding: 8px 12px; border-right: 1px solid #dcdcdc; border-top: 1px solid #dcdcdc;">실수</td>
<td style="box-sizing: border-box; padding: 8px 12px; border-right: 0px; border-top: 1px solid #dcdcdc;">immutable</td>
</tr>
<tr style="box-sizing: border-box;">
<td style="box-sizing: border-box; padding: 8px 12px; border-right: 1px solid #dcdcdc; border-top: 1px solid #dcdcdc;">tuple</td>
<td style="box-sizing: border-box; padding: 8px 12px; border-right: 1px solid #dcdcdc; border-top: 1px solid #dcdcdc;">immutable 한 순서가 있는 객체 집합</td>
<td style="box-sizing: border-box; padding: 8px 12px; border-right: 0px; border-top: 1px solid #dcdcdc;">immutable</td>
</tr>
<tr style="box-sizing: border-box;">
<td style="box-sizing: border-box; padding: 8px 12px; border-right: 1px solid #dcdcdc; border-top: 1px solid #dcdcdc;">str</td>
<td style="box-sizing: border-box; padding: 8px 12px; border-right: 1px solid #dcdcdc; border-top: 1px solid #dcdcdc;">문자열</td>
<td style="box-sizing: border-box; padding: 8px 12px; border-right: 0px; border-top: 1px solid #dcdcdc;">immutable</td>
</tr>
<tr style="box-sizing: border-box;">
<td style="box-sizing: border-box; padding: 8px 12px; border-right: 1px solid #dcdcdc; border-top: 1px solid #dcdcdc;">frozenset</td>
<td style="box-sizing: border-box; padding: 8px 12px; border-right: 1px solid #dcdcdc; border-top: 1px solid #dcdcdc;">immutable한 set</td>
<td style="box-sizing: border-box; padding: 8px 12px; border-right: 0px; border-top: 1px solid #dcdcdc;">immutable</td>
</tr>
</tbody>
</table>

<p>저도 이거 궁금했는데 감사합니다</p>

인프런 커뮤니티 질문&답변

참조 에러 이해 문제

class	설명	구분
list	mutable 한 순서가 있는 객체 집합	mutable
set	mutable 한 순서가 없는 고유한 객체 집합	mutable
dict	key와 value가 맵핑된 객체, 순서 없음	mutable
bool	참,거짓	immutable
int	정수	immutable
float	실수	immutable
tuple	immutable 한 순서가 있는 객체 집합	immutable
str	문자열	immutable
frozenset	immutable한 set	immutable