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‎images/list-copy-06.png‎

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‎lists-tuples.ipynb‎

Lines changed: 52 additions & 9 deletions
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@@ -95,7 +95,7 @@
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"id": "b7465925-f58b-4e43-ab1e-16230af1255d",
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"metadata": {},
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"source": [
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"<div align=\"center\" border=\"1px\"><img src=\"https://raw.githubusercontent.com/codingalzi/42H/master/jupyter-book/images/built-in-types.png\" width=\"350\"/></div>\n",
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"<div align=\"center\" border=\"1px\"><img src=\"https://raw.githubusercontent.com/codingalzi/code-workout-python/master/images/built-in-types.png\" width=\"350\"/></div>\n",
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"<br>"
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]
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},
@@ -2037,7 +2037,7 @@
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"id": "0e2db984-ef8d-4b31-9628-ad2a17610d00",
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"metadata": {},
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"source": [
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"<div align=\"center\" border=\"1px\"><img src=\"https://raw.githubusercontent.com/codingalzi/42H/master/jupyter-book/images/list-copy-01.png\" width=\"800\"/></div>\n",
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"<div align=\"center\" border=\"1px\"><img src=\"https://raw.githubusercontent.com/codingalzi/code-workout-python/master/images/list-copy-01.png\" width=\"800\"/></div>\n",
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"\n",
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"<p><div style=\"text-align: center\">&lt;그림 출처: <a href=\"https://pythontutor.com/render.html#code=x%20%20%3D%20%5B1,%202,%203%5D%0Ay%20%3D%20x.copy%28%29%0Ay%5B0%5D%20%3D%2010&cumulative=false&curInstr=0&heapPrimitives=nevernest&mode=display&origin=opt-frontend.js&py=3&rawInputLstJSON=%5B%5D&textReferences=false\">Python Tutor</a>&gt;</div></p>"
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]
@@ -2056,7 +2056,7 @@
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"id": "a258c46a-723f-4bd3-8328-4a866fd09774",
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"metadata": {},
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"source": [
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"<div align=\"center\" border=\"1px\"><img src=\"https://raw.githubusercontent.com/codingalzi/42H/master/jupyter-book/images/list-copy-02.png\" width=\"800\"/></div>\n",
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"<div align=\"center\" border=\"1px\"><img src=\"https://raw.githubusercontent.com/codingalzi/code-workout-python/master/images/list-copy-02.png\" width=\"800\"/></div>\n",
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"\n",
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"<p><div style=\"text-align: center\">&lt;그림 출처: <a href=\"https://pythontutor.com/render.html#code=x%20%20%3D%20%5B1,%202,%203%5D%0Ay%20%3D%20x.copy%28%29%0Ay%5B0%5D%20%3D%2010&cumulative=false&curInstr=0&heapPrimitives=nevernest&mode=display&origin=opt-frontend.js&py=3&rawInputLstJSON=%5B%5D&textReferences=false\">Python Tutor</a>&gt;</div></p>"
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]
@@ -2108,7 +2108,7 @@
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"id": "74402f12-6f93-488b-b584-5077579aecc2",
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"metadata": {},
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"source": [
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"<div align=\"center\" border=\"1px\"><img src=\"https://raw.githubusercontent.com/codingalzi/42H/master/jupyter-book/images/list-copy-03.png\" width=\"800\"/></div>\n",
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"<div align=\"center\" border=\"1px\"><img src=\"https://raw.githubusercontent.com/codingalzi/code-workout-python/master/images/list-copy-03.png\" width=\"800\"/></div>\n",
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"\n",
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"<p><div style=\"text-align: center\">&lt;그림 출처: <a href=\"https://pythontutor.com/render.html#code=x%20%20%3D%20%5B1,%202,%203%5D%0Ay%20%3D%20x%0Ay%5B0%5D%20%3D%2010&cumulative=false&curInstr=0&heapPrimitives=nevernest&mode=display&origin=opt-frontend.js&py=3&rawInputLstJSON=%5B%5D&textReferences=false\">Python Tutor</a>&gt;</div></p>"
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]
@@ -2127,7 +2127,7 @@
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"id": "b2683bab-fe5d-4946-936d-3a9accb0cdfc",
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"metadata": {},
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"source": [
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"<div align=\"center\" border=\"1px\"><img src=\"https://raw.githubusercontent.com/codingalzi/42H/master/jupyter-book/images/list-copy-04.png\" width=\"800\"/></div>\n",
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"<div align=\"center\" border=\"1px\"><img src=\"https://raw.githubusercontent.com/codingalzi/code-workout-python/master/images/list-copy-04.png\" width=\"800\"/></div>\n",
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"\n",
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"<p><div style=\"text-align: center\">&lt;그림 출처: <a href=\"https://pythontutor.com/render.html#code=x%20%20%3D%20%5B1,%202,%203%5D%0Ay%20%3D%20x%0Ay%5B0%5D%20%3D%2010&cumulative=false&curInstr=0&heapPrimitives=nevernest&mode=display&origin=opt-frontend.js&py=3&rawInputLstJSON=%5B%5D&textReferences=false\">Python Tutor</a>&gt;</div></p>"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 59,
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"execution_count": 61,
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"id": "19bc883c",
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"metadata": {},
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"outputs": [
@@ -2170,17 +2170,17 @@
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"y_nested[0][0] = 10 # 0번 인데스 항목 수정\n",
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"\n",
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"print(\"y_nested:\", y_nested) # 수정됨\n",
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"print(\"x_nested:\", x_nested) # 불변"
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"print(\"x_nested:\", x_nested) # 항목 리스트는 불변이 아님"
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]
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},
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{
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"cell_type": "markdown",
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"id": "0d4bed30",
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"metadata": {},
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"source": [
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"<div align=\"center\" border=\"1px\"><img src=\"https://raw.githubusercontent.com/codingalzi/42H/master/jupyter-book/images/list-copy-04.png\" width=\"800\"/></div>\n",
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"<div align=\"center\" border=\"1px\"><img src=\"https://raw.githubusercontent.com/codingalzi/code-workout-python/master/images/list-copy-05.png\" width=\"950\"/></div>\n",
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"\n",
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"<p><div style=\"text-align: center\">&lt;그림 출처: <a href=\"https://pythontutor.com/render.html#code=x%20%20%3D%20%5B1,%202,%203%5D%0Ay%20%3D%20x%0Ay%5B0%5D%20%3D%2010&cumulative=false&curInstr=0&heapPrimitives=nevernest&mode=display&origin=opt-frontend.js&py=3&rawInputLstJSON=%5B%5D&textReferences=false\">Python Tutor</a>&gt;</div></p>"
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"<p><div style=\"text-align: center\">&lt;그림 출처: <a href=\"https://pythontutor.com/visualize.html#code=x_nested%20%20%3D%20%5B%5B1,%202,%203%5D,%20%5B4,%205,%206%5D%5D%0Ay_nested%20%3D%20x_nested.copy%28%29%0Ay_nested%5B0%5D%5B0%5D%20%3D%2010&curInstr=0&mode=display&origin=opt-frontend.js&py=3\">Python Tutor</a>&gt;</div></p>"
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]
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},
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{
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"이 사실을 아래 이미지가 잘 보여준다."
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]
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},
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{
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"cell_type": "markdown",
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"id": "dbbdcc34",
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"metadata": {},
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"source": [
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"**`copy.deepcopy()` 함수**"
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]
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},
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{
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"cell_type": "markdown",
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"id": "8bf65448",
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"metadata": {},
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"source": [
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"중첩 리스트의 항목까지 복제해서 사본을 만드려면 `copy` 모듈의 `deepcopy()` 함수를 활용한다.\n",
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"아래 코드에서 확인할 수 있듯이 `copy.deepcopy()` 함수를 활용하면 완전히 독립된 사본이 생성된다."
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]
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},
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{
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"cell_type": "code",
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"execution_count": 62,
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"id": "f20d3959",
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"y_nested: [[10, 2, 3], [4, 5, 6]]\n",
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"x_nested: [[1, 2, 3], [4, 5, 6]]\n"
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]
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}
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],
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"source": [
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"import copy\n",
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"\n",
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"x_nested = [[1, 2, 3], [4, 5, 6]]\n",
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"y_nested = copy.deepcopy(x_nested)\n",
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"y_nested[0][0] = 10 # 0번 인데스 항목 수정\n",
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"\n",
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"print(\"y_nested:\", y_nested) # 수정됨\n",
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"print(\"x_nested:\", x_nested) # 항목 리스트도 불변"
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]
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},
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{
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"cell_type": "markdown",
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"id": "e8908426-1d2b-4fc3-a5c9-3a839cdfa78f",

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