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September 29, 2018 11:05
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{ | |
"cells": [ | |
{ | |
"cell_type": "code", | |
"execution_count": 1, | |
"metadata": { | |
"collapsed": true | |
}, | |
"outputs": [], | |
"source": [ | |
"students = ['Alice', 'Bob', 'Claudia']\n", | |
"grades = [5, 3, 4]" | |
] | |
}, | |
{ | |
"cell_type": "markdown", | |
"metadata": {}, | |
"source": [ | |
" Alice 5\n", | |
" Bob 3\n", | |
" Claudia 4" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 2, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"name": "stdout", | |
"output_type": "stream", | |
"text": [ | |
"Alice 5\n", | |
"Bob 3\n", | |
"Claudia 4\n" | |
] | |
} | |
], | |
"source": [ | |
"for student, grade in zip(students, grades):\n", | |
" print(student, grade)" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 3, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"[('Alice', 5), ('Bob', 3), ('Claudia', 4)]" | |
] | |
}, | |
"execution_count": 3, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"list(zip(students, grades))" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": null, | |
"metadata": { | |
"collapsed": true | |
}, | |
"outputs": [], | |
"source": [ | |
"s = \"\"\"hello\n", | |
"world\n", | |
"\"\"\"\n", | |
"# multiline string" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 8, | |
"metadata": { | |
"collapsed": true | |
}, | |
"outputs": [], | |
"source": [ | |
"def elementwise_sum(u, v):\n", | |
" \"\"\"\n", | |
" u, v - two lists of numbers\n", | |
" returns list w\n", | |
" w[i] = u[i] + v[i] for all i\n", | |
" \"\"\"\n", | |
"# assert isinstance(u, list) and isinstance(v, list)\n", | |
" return [u_ + v_ for u_, v_ in zip(u, v)]" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 9, | |
"metadata": { | |
"collapsed": true | |
}, | |
"outputs": [], | |
"source": [ | |
"assert elementwise_sum([1, 2], [3, 4]) == [4, 6]" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 10, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"[4, 6]" | |
] | |
}, | |
"execution_count": 10, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"elementwise_sum([1, 2], [3, 4])" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 11, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"['HW', 'eo', 'lr', 'll', 'od']" | |
] | |
}, | |
"execution_count": 11, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"elementwise_sum(\"Hello\", \"World\")" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 14, | |
"metadata": { | |
"collapsed": true | |
}, | |
"outputs": [], | |
"source": [ | |
"gradebook = {'Alice': 5, 'Bob': 3, 'Claudia': 5}" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 15, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"dict" | |
] | |
}, | |
"execution_count": 15, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"type(gradebook)" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 16, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"3" | |
] | |
}, | |
"execution_count": 16, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"gradebook['Bob']" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 17, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"5" | |
] | |
}, | |
"execution_count": 17, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"gradebook['Claudia']" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 18, | |
"metadata": { | |
"collapsed": true | |
}, | |
"outputs": [], | |
"source": [ | |
"gradebook['Bob'] = 4" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 19, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"{'Alice': 5, 'Bob': 4, 'Claudia': 5}" | |
] | |
}, | |
"execution_count": 19, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"gradebook" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 20, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"ename": "KeyError", | |
"evalue": "'Daniel'", | |
"output_type": "error", | |
"traceback": [ | |
"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m", | |
"\u001b[1;31mKeyError\u001b[0m Traceback (most recent call last)", | |
"\u001b[1;32m<ipython-input-20-4304a21bd337>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[1;32m----> 1\u001b[1;33m \u001b[0mgradebook\u001b[0m\u001b[1;33m[\u001b[0m\u001b[1;34m'Daniel'\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m", | |
"\u001b[1;31mKeyError\u001b[0m: 'Daniel'" | |
] | |
} | |
], | |
"source": [ | |
"gradebook['Daniel']" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 21, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"False" | |
] | |
}, | |
"execution_count": 21, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"'Daniel' in gradebook" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 22, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"True" | |
] | |
}, | |
"execution_count": 22, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"'Alice' in gradebook" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 23, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"5" | |
] | |
}, | |
"execution_count": 23, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"gradebook.get('Alice')" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 25, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"True" | |
] | |
}, | |
"execution_count": 25, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"gradebook.get('Daniel') is None" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 28, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"0" | |
] | |
}, | |
"execution_count": 28, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"gradebook.get('Daniel', 0)" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 29, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"5" | |
] | |
}, | |
"execution_count": 29, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"gradebook.get('Alice', 0)" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 30, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"{'Alice': 5, 'Bob': 4, 'Claudia': 5}" | |
] | |
}, | |
"execution_count": 30, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"gradebook" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 31, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"name": "stdout", | |
"output_type": "stream", | |
"text": [ | |
"Alice\n", | |
"Bob\n", | |
"Claudia\n" | |
] | |
} | |
], | |
"source": [ | |
"for student in gradebook:\n", | |
" print(student)" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 32, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"name": "stdout", | |
"output_type": "stream", | |
"text": [ | |
"Alice 5\n", | |
"Bob 4\n", | |
"Claudia 5\n" | |
] | |
} | |
], | |
"source": [ | |
"for student in gradebook:\n", | |
" print(student, gradebook[student])" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 33, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"name": "stdout", | |
"output_type": "stream", | |
"text": [ | |
"Alice 5\n", | |
"Bob 4\n", | |
"Claudia 5\n" | |
] | |
} | |
], | |
"source": [ | |
"for student, grade in gradebook.items():\n", | |
" print(student, grade)" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 34, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"dict_items([('Alice', 5), ('Bob', 4), ('Claudia', 5)])" | |
] | |
}, | |
"execution_count": 34, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"gradebook.items()" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 35, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"4.666666666666667" | |
] | |
}, | |
"execution_count": 35, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"sum(gradebook.values()) / len(gradebook)" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 36, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"dict_values([5, 4, 5])" | |
] | |
}, | |
"execution_count": 36, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"gradebook.values()" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 37, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"dict_keys(['Alice', 'Bob', 'Claudia'])" | |
] | |
}, | |
"execution_count": 37, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"gradebook.keys()" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 38, | |
"metadata": { | |
"collapsed": true | |
}, | |
"outputs": [], | |
"source": [ | |
"gradebook = {'Alice': [3, 4], 'Bob': [5], 'Claudia': [2, 4, 1]}" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 39, | |
"metadata": { | |
"collapsed": true | |
}, | |
"outputs": [], | |
"source": [ | |
"gradebook = [{'Alice': 4, 'Bob': 5},\n", | |
" {'Alice': 5, 'Claudia': 4}]" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 42, | |
"metadata": { | |
"collapsed": true | |
}, | |
"outputs": [], | |
"source": [ | |
"x = ['q']\n", | |
"x.append(x)" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 43, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"['q', [...]]" | |
] | |
}, | |
"execution_count": 43, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"x" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 44, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"['q', [...]]" | |
] | |
}, | |
"execution_count": 44, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"x[1]" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 45, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"['q', [...]]" | |
] | |
}, | |
"execution_count": 45, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"x[1][1]" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 47, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"ename": "TypeError", | |
"evalue": "unsupported operand type(s) for +: 'int' and 'NoneType'", | |
"output_type": "error", | |
"traceback": [ | |
"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m", | |
"\u001b[1;31mTypeError\u001b[0m Traceback (most recent call last)", | |
"\u001b[1;32m<ipython-input-47-b9dbf7fee52a>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[1;32m----> 1\u001b[1;33m \u001b[0msum\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m[\u001b[0m\u001b[1;32mNone\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;36m4\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;36m3\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m", | |
"\u001b[1;31mTypeError\u001b[0m: unsupported operand type(s) for +: 'int' and 'NoneType'" | |
] | |
} | |
], | |
"source": [ | |
"sum([None, 4, 3])" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 48, | |
"metadata": { | |
"collapsed": true | |
}, | |
"outputs": [], | |
"source": [ | |
"my_dict = {'a': 5, 'b': 3}" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 50, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"{'1': 987, '2': 987, '3': 987}" | |
] | |
}, | |
"execution_count": 50, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"dict.fromkeys(['1', '2', '3'], 987)" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 51, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"ename": "TypeError", | |
"evalue": "unhashable type: 'list'", | |
"output_type": "error", | |
"traceback": [ | |
"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m", | |
"\u001b[1;31mTypeError\u001b[0m Traceback (most recent call last)", | |
"\u001b[1;32m<ipython-input-51-400a52570e1e>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[1;32m----> 1\u001b[1;33m \u001b[0msums\u001b[0m \u001b[1;33m=\u001b[0m \u001b[1;33m{\u001b[0m\u001b[1;33m[\u001b[0m\u001b[1;36m2\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;36m3\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m:\u001b[0m \u001b[1;36m5\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;33m[\u001b[0m\u001b[1;36m1\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;36m2\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m:\u001b[0m \u001b[1;36m3\u001b[0m\u001b[1;33m}\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m", | |
"\u001b[1;31mTypeError\u001b[0m: unhashable type: 'list'" | |
] | |
} | |
], | |
"source": [ | |
"sums = {[2, 3]: 5, [1, 2]: 3}" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 52, | |
"metadata": { | |
"collapsed": true | |
}, | |
"outputs": [], | |
"source": [ | |
"sums = {(2, 3): 5, (1, 2): 3}" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 53, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"5" | |
] | |
}, | |
"execution_count": 53, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"sums[(2, 3)]" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 54, | |
"metadata": { | |
"collapsed": true | |
}, | |
"outputs": [], | |
"source": [ | |
"squares = {2: 4, 5: 25}" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 55, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"4" | |
] | |
}, | |
"execution_count": 55, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"squares[2]" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 56, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"ename": "KeyError", | |
"evalue": "0", | |
"output_type": "error", | |
"traceback": [ | |
"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m", | |
"\u001b[1;31mKeyError\u001b[0m Traceback (most recent call last)", | |
"\u001b[1;32m<ipython-input-56-58a7a2576c1f>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[1;32m----> 1\u001b[1;33m \u001b[0msquares\u001b[0m\u001b[1;33m[\u001b[0m\u001b[1;36m0\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m", | |
"\u001b[1;31mKeyError\u001b[0m: 0" | |
] | |
} | |
], | |
"source": [ | |
"squares[0]" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 60, | |
"metadata": { | |
"collapsed": true | |
}, | |
"outputs": [], | |
"source": [ | |
"# gradebook = {'Alice': 4, 'Bob': 5, 'Claudia': 4, 'Elizabeth': 2}\n", | |
"# get list of students with grade > 2\n", | |
"def good_students(gradebook):\n", | |
" gs = []\n", | |
" for student, grade in gradebook.items():\n", | |
" if grade > 2:\n", | |
" gs.append(student)\n", | |
" return gs" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 63, | |
"metadata": { | |
"collapsed": true | |
}, | |
"outputs": [], | |
"source": [ | |
"# gradebook = {'Alice': 4, 'Bob': 5, 'Claudia': 4, 'Elizabeth': 2}\n", | |
"# get list of students with grade > 2\n", | |
"def good_students(gradebook):\n", | |
" return [student for student, grade in gradebook.items() \n", | |
" if grade > 2]" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 64, | |
"metadata": {}, | |
"outputs": [], | |
"source": [ | |
"assert good_students({'Alice': 4, \n", | |
" 'Bob': 5, \n", | |
" 'Claudia': 4, \n", | |
" 'Elizabeth': 2}) == ['Alice', 'Bob',\n", | |
" 'Claudia']" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 66, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"[0,\n", | |
" 16,\n", | |
" 64,\n", | |
" 144,\n", | |
" 256,\n", | |
" 400,\n", | |
" 576,\n", | |
" 784,\n", | |
" 1024,\n", | |
" 1296,\n", | |
" 1600,\n", | |
" 1936,\n", | |
" 2304,\n", | |
" 2704,\n", | |
" 3136,\n", | |
" 3600,\n", | |
" 4096,\n", | |
" 4624,\n", | |
" 5184,\n", | |
" 5776,\n", | |
" 6400,\n", | |
" 7056,\n", | |
" 7744,\n", | |
" 8464,\n", | |
" 9216]" | |
] | |
}, | |
"execution_count": 66, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"[x ** 2 for x in range(100) if x % 4 == 0]" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 67, | |
"metadata": { | |
"collapsed": true | |
}, | |
"outputs": [], | |
"source": [ | |
"squares = {x: x ** 2 for x in range(5)}" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 68, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"{0: 0, 1: 1, 2: 4, 3: 9, 4: 16}" | |
] | |
}, | |
"execution_count": 68, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"squares" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 69, | |
"metadata": { | |
"collapsed": true | |
}, | |
"outputs": [], | |
"source": [ | |
"numbers = [5, 2, 12, 3]\n", | |
"numbers.sort()" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 70, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"[2, 3, 5, 12]" | |
] | |
}, | |
"execution_count": 70, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"numbers" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 71, | |
"metadata": { | |
"collapsed": true | |
}, | |
"outputs": [], | |
"source": [ | |
"numbers = [5, 2, 12, 3]\n", | |
"numbers.sort(reverse=True)" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 72, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"[12, 5, 3, 2]" | |
] | |
}, | |
"execution_count": 72, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"numbers" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 73, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"[2, 4, 7, 8]" | |
] | |
}, | |
"execution_count": 73, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"sorted([7, 4, 2, 8])" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 74, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"name": "stdout", | |
"output_type": "stream", | |
"text": [ | |
"[2, 4.6, 7, 8.1]\n", | |
"[7, 4.6, 2, 8.1]\n" | |
] | |
} | |
], | |
"source": [ | |
"numbers = [7, 4.6, 2, 8.1]\n", | |
"print(sorted(numbers))\n", | |
"print(numbers)" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 75, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"True" | |
] | |
}, | |
"execution_count": 75, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"\"Hello\" < \"World\"" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 76, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"True" | |
] | |
}, | |
"execution_count": 76, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"\"a\" < \"b\"" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 77, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"True" | |
] | |
}, | |
"execution_count": 77, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"\"ab\" < \"ac\"" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 79, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"True" | |
] | |
}, | |
"execution_count": 79, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"\"A\" < \"a\"" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 80, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"1105" | |
] | |
}, | |
"execution_count": 80, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"ord(\"ё\")" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 81, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"1077" | |
] | |
}, | |
"execution_count": 81, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"ord(\"е\")" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 83, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"['Alice', 'Alla', 'Bill', 'Bob']" | |
] | |
}, | |
"execution_count": 83, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"sorted([\"Bob\", \"Alice\", \"Alla\", \"Bill\"])" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 85, | |
"metadata": { | |
"collapsed": true | |
}, | |
"outputs": [], | |
"source": [ | |
"table = [[4, 5], \n", | |
" [6, 3], \n", | |
" [2, 5], \n", | |
" [6, 1]]" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 86, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"[[2, 5], [4, 5], [6, 1], [6, 3]]" | |
] | |
}, | |
"execution_count": 86, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"sorted(table)" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 87, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"True" | |
] | |
}, | |
"execution_count": 87, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"[1, 4] < [2, 0]" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 90, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"False" | |
] | |
}, | |
"execution_count": 90, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"[1, 3] < [1, 2, 1]" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 91, | |
"metadata": { | |
"collapsed": true | |
}, | |
"outputs": [], | |
"source": [ | |
"def subs2(f):\n", | |
" return f(2)" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 92, | |
"metadata": { | |
"collapsed": true | |
}, | |
"outputs": [], | |
"source": [ | |
"def plusodin(x):\n", | |
" return x + 1" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 93, | |
"metadata": { | |
"collapsed": true | |
}, | |
"outputs": [], | |
"source": [ | |
"from math import log, sqrt" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 94, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"3" | |
] | |
}, | |
"execution_count": 94, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"subs2(plusodin)" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 95, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"1.4142135623730951" | |
] | |
}, | |
"execution_count": 95, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"subs2(sqrt)" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 96, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"['is', 'the', 'this', 'best', 'hello', 'world']" | |
] | |
}, | |
"execution_count": 96, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"sorted([\"hello\", 'this', 'world', 'is', 'the', 'best'],\n", | |
" key=len)" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 97, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"['is', 'the', 'best', 'this', 'hello', 'world']" | |
] | |
}, | |
"execution_count": 97, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"sorted([\"hello\", 'best', 'this', 'world', 'is', 'the'],\n", | |
" key=len)" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 112, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"name": "stdout", | |
"output_type": "stream", | |
"text": [ | |
"my_sort_key invoked, item = [4, 5]\n", | |
"my_sort_key invoked, item = [6, 3]\n", | |
"my_sort_key invoked, item = [2, 5]\n", | |
"my_sort_key invoked, item = [6, 1]\n" | |
] | |
}, | |
{ | |
"data": { | |
"text/plain": [ | |
"[[6, 1], [6, 3], [4, 5], [2, 5]]" | |
] | |
}, | |
"execution_count": 112, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"table = [[4, 5], \n", | |
" [6, 3], \n", | |
" [2, 5], \n", | |
" [6, 1]]\n", | |
"# sort by second column\n", | |
"def my_sort_key(item):\n", | |
" print(\"my_sort_key invoked, item =\", item)\n", | |
" return item[1]\n", | |
"sorted(table, key=my_sort_key)" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 100, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"[[6, 1], [6, 3], [4, 5], [2, 5]]" | |
] | |
}, | |
"execution_count": 100, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"sorted(table, key=lambda z: z[1])" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 101, | |
"metadata": { | |
"collapsed": true | |
}, | |
"outputs": [], | |
"source": [ | |
"def foo(x):\n", | |
" return x ** 2" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 102, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"9" | |
] | |
}, | |
"execution_count": 102, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"foo(3)" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 103, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"100" | |
] | |
}, | |
"execution_count": 103, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"(lambda x: x ** 2)(10)" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 104, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"[4, 6]" | |
] | |
}, | |
"execution_count": 104, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"sorted([4, 6])" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 105, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"[4, 6]" | |
] | |
}, | |
"execution_count": 105, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"num = [4, 6]\n", | |
"sorted(num)" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 106, | |
"metadata": { | |
"collapsed": true | |
}, | |
"outputs": [], | |
"source": [ | |
"from operator import itemgetter" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 107, | |
"metadata": { | |
"collapsed": true | |
}, | |
"outputs": [], | |
"source": [ | |
"f = itemgetter(1)" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 108, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"8" | |
] | |
}, | |
"execution_count": 108, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"f([6, 8, 10])" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 109, | |
"metadata": { | |
"collapsed": true | |
}, | |
"outputs": [], | |
"source": [ | |
"f = itemgetter(2)" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 110, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"10" | |
] | |
}, | |
"execution_count": 110, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"f([6, 8, 10])" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 114, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"name": "stdout", | |
"output_type": "stream", | |
"text": [ | |
"my_sort_key invoked, item = [4, 5]\n", | |
"my_sort_key invoked, item = [6, 3]\n", | |
"my_sort_key invoked, item = [2, 5]\n", | |
"my_sort_key invoked, item = [6, 1]\n" | |
] | |
}, | |
{ | |
"data": { | |
"text/plain": [ | |
"[[6, 1], [6, 3], [2, 5], [4, 5]]" | |
] | |
}, | |
"execution_count": 114, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"table = [[4, 5], \n", | |
" [6, 3], \n", | |
" [2, 5], \n", | |
" [6, 1]]\n", | |
"# sort by second column\n", | |
"def my_sort_key(item):\n", | |
" print(\"my_sort_key invoked, item =\", item)\n", | |
" return (item[1], item[0], len(item))\n", | |
"sorted(table, key=my_sort_key)" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": null, | |
"metadata": { | |
"collapsed": true | |
}, | |
"outputs": [], | |
"source": [ | |
"sorted" | |
] | |
} | |
], | |
"metadata": { | |
"kernelspec": { | |
"display_name": "Python 3", | |
"language": "python", | |
"name": "python3" | |
}, | |
"language_info": { | |
"codemirror_mode": { | |
"name": "ipython", | |
"version": 3 | |
}, | |
"file_extension": ".py", | |
"mimetype": "text/x-python", | |
"name": "python", | |
"nbconvert_exporter": "python", | |
"pygments_lexer": "ipython3", | |
"version": "3.6.3" | |
} | |
}, | |
"nbformat": 4, | |
"nbformat_minor": 2 | |
} |
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