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James Turk 2024-09-30 00:42:17 -05:00
parent 23a364774e
commit bded23163b
4 changed files with 175 additions and 119 deletions
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107
01.basics-1.ipynb
View file

@ -305,7 +305,9 @@
} }
], ],
"source": [ "source": [
"print(\"Hi\", 2 * 3 * 47 * 181, \"!\") # the advantage is that I can mix code in with my notes" "print(\n",
" \"Hi\", 2 * 3 * 47 * 181, \"!\"\n",
") # the advantage is that I can mix code in with my notes"
] ]
}, },
{ {
@ -508,7 +510,7 @@
"\n", "\n",
"print(100 // 2)\n", "print(100 // 2)\n",
"\n", "\n",
"m = 10*9*8*7*6*5*4*3*2\n", "m = 10 * 9 * 8 * 7 * 6 * 5 * 4 * 3 * 2\n",
"n = 3628800 # 10!\n", "n = 3628800 # 10!\n",
"print(n % 11)" "print(n % 11)"
] ]
@ -547,7 +549,7 @@
} }
], ],
"source": [ "source": [
"(.1 + .2) == .3" "(0.1 + 0.2) == 0.3"
] ]
}, },
{ {
@ -570,7 +572,7 @@
} }
], ],
"source": [ "source": [
".1 + .2" "0.1 + 0.2"
] ]
}, },
{ {
@ -602,12 +604,12 @@
} }
], ],
"source": [ "source": [
"print(.1 + .2 == .3)\n", "print(0.1 + 0.2 == 0.3)\n",
"\n", "\n",
"episilon = 0.000000001\n", "episilon = 0.000000001\n",
"abs((.1 + .2) - .3) < episilon\n", "abs((0.1 + 0.2) - 0.3) < episilon\n",
"\n", "\n",
"#bank_account_hundredths_of_cent = 1000000000" "# bank_account_hundredths_of_cent = 1000000000"
] ]
}, },
{ {
@ -660,7 +662,7 @@
"\n", "\n",
"s = \"Hello\"\n", "s = \"Hello\"\n",
"s += \" Class\"\n", "s += \" Class\"\n",
"#s /= \"l\"\n", "# s /= \"l\"\n",
"print(s)" "print(s)"
] ]
}, },
@ -818,10 +820,12 @@
"# we'll discuss how to write functions/etc. soon\n", "# we'll discuss how to write functions/etc. soon\n",
"import time\n", "import time\n",
"\n", "\n",
"\n",
"def short_func():\n", "def short_func():\n",
" print(\"short_func\")\n", " print(\"short_func\")\n",
" return False\n", " return False\n",
"\n", "\n",
"\n",
"def long_func():\n", "def long_func():\n",
" print(\"long_func\")\n", " print(\"long_func\")\n",
" time.sleep(1)\n", " time.sleep(1)\n",
@ -999,11 +1003,11 @@
"\n", "\n",
"# Like many languages, Python supports special 'escape characters'.\n", "# Like many languages, Python supports special 'escape characters'.\n",
"\n", "\n",
"#print(\"Another way to \\\"quote\\\" something.\")\n", "# print(\"Another way to \\\"quote\\\" something.\")\n",
"\n", "\n",
"#print('An alternate apostrophe: \\' ')\n", "# print('An alternate apostrophe: \\' ')\n",
"\n", "\n",
"#print(\"Newline character: \\n starts a new line.\")\n", "# print(\"Newline character: \\n starts a new line.\")\n",
"\n", "\n",
"print(\"Sometimes you need a \\\\ backslash.\")" "print(\"Sometimes you need a \\\\ backslash.\")"
] ]
@ -1049,7 +1053,7 @@
"source": [ "source": [
"# Raw Strings\n", "# Raw Strings\n",
"\n", "\n",
"# Sometimes it is undesirable to escape every backslash. \n", "# Sometimes it is undesirable to escape every backslash.\n",
"\n", "\n",
"# Two common examples are when dealing with file paths on Windows or Regular Expressions.\n", "# Two common examples are when dealing with file paths on Windows or Regular Expressions.\n",
"\n", "\n",
@ -1258,7 +1262,7 @@
"user = \"James\"\n", "user = \"James\"\n",
"num = 1234\n", "num = 1234\n",
"\n", "\n",
"print(f\"{user=} {num=}\") \n", "print(f\"{user=} {num=}\")\n",
"# same as f\"user={user} num={num}\" but less repetition\n", "# same as f\"user={user} num={num}\" but less repetition\n",
"\n", "\n",
"# = is a format specifier, there are many others for aligning output, truncating decimals, etc.\n", "# = is a format specifier, there are many others for aligning output, truncating decimals, etc.\n",
@ -1304,7 +1308,7 @@
"\n", "\n",
"# lists can contain items of different types\n", "# lists can contain items of different types\n",
"\n", "\n",
"things = [123, \"abc\", 1.23j+4.5]\n", "things = [123, \"abc\", 1.23j + 4.5]\n",
"\n", "\n",
"# lists can contain other lists\n", "# lists can contain other lists\n",
"\n", "\n",
@ -1349,9 +1353,9 @@
"\n", "\n",
"empty_tuple = ()\n", "empty_tuple = ()\n",
"\n", "\n",
"one_item_tuple = (1+2,) # why is the comma necessary?\n", "one_item_tuple = (1 + 2,) # why is the comma necessary?\n",
"\n", "\n",
"bad_tuple = (1+492)\n", "bad_tuple = 1 + 492\n",
"\n", "\n",
"print(bad_tuple) # why is this not a tuple?" "print(bad_tuple) # why is this not a tuple?"
] ]
@ -1584,10 +1588,10 @@
"[\"\"] * 100\n", "[\"\"] * 100\n",
"\n", "\n",
"\n", "\n",
"#x = (\"a\", \"b\", \"c\")\n", "# x = (\"a\", \"b\", \"c\")\n",
"#y = (\"z\", \"z\", \"z\")\n", "# y = (\"z\", \"z\", \"z\")\n",
"#z = x + y\n", "# z = x + y\n",
"#z" "# z"
] ]
}, },
{ {
@ -1602,7 +1606,7 @@
"# concatenation & repetition demo\n", "# concatenation & repetition demo\n",
"s2 = \"*\" * 5\n", "s2 = \"*\" * 5\n",
"t2 = (True, False) * 3\n", "t2 = (True, False) * 3\n",
"l2 = [\"a\", \"b\", \"c\"] * 4\n" "l2 = [\"a\", \"b\", \"c\"] * 4"
] ]
}, },
{ {
@ -1640,7 +1644,18 @@
} }
], ],
"source": [ "source": [
"cities = [\"Tokyo\", \"Delhi\", \"Shanghai\", \"São Paulo\", \"Mexico City\", \"Cairo\", \"Mumbai\", \"Beijing\", \"Dhaka\", \"Osaka\"]\n", "cities = [\n",
" \"Tokyo\",\n",
" \"Delhi\",\n",
" \"Shanghai\",\n",
" \"São Paulo\",\n",
" \"Mexico City\",\n",
" \"Cairo\",\n",
" \"Mumbai\",\n",
" \"Beijing\",\n",
" \"Dhaka\",\n",
" \"Osaka\",\n",
"]\n",
"text = \"Four score and seven years ago our fathers brought forth, upon this continent, a new nation, conceived in liberty, and dedicated to the proposition that all men are created equal\"\n", "text = \"Four score and seven years ago our fathers brought forth, upon this continent, a new nation, conceived in liberty, and dedicated to the proposition that all men are created equal\"\n",
"ids = (123, 555, 81, 110, 44, 12, 16)\n", "ids = (123, 555, 81, 110, 44, 12, 16)\n",
"ids[0]" "ids[0]"
@ -1713,15 +1728,15 @@
"outputs": [], "outputs": [],
"source": [ "source": [
"# slicing\n", "# slicing\n",
"#print(cities)\n", "# print(cities)\n",
"print(cities[8:])\n", "print(cities[8:])\n",
"#print(cities[:4])\n", "# print(cities[:4])\n",
"#print(cities[8:])\n", "# print(cities[8:])\n",
"#print(cities[4:-3])\n", "# print(cities[4:-3])\n",
"\n", "\n",
"#print(text)\n", "# print(text)\n",
"#print(text[0:4])\n", "# print(text[0:4])\n",
"#print(text[:])\n", "# print(text[:])\n",
"\n", "\n",
"# print(ids[1:4])" "# print(ids[1:4])"
] ]
@ -1865,7 +1880,7 @@
"\n", "\n",
"# find\n", "# find\n",
"pos = s.find(\"world\")\n", "pos = s.find(\"world\")\n",
"#print(pos)\n", "# print(pos)\n",
"print(s[pos:])\n", "print(s[pos:])\n",
"\n", "\n",
"upper = s.upper()\n", "upper = s.upper()\n",
@ -1996,14 +2011,14 @@
"x = 49490\n", "x = 49490\n",
"\n", "\n",
"if x < 0:\n", "if x < 0:\n",
" print('negative')\n", " print(\"negative\")\n",
" print(\"second line\")\n", " print(\"second line\")\n",
"elif x == 0:\n", "elif x == 0:\n",
" print('zero')\n", " print(\"zero\")\n",
"elif x == 4:\n", "elif x == 4:\n",
" print(\"four\")\n", " print(\"four\")\n",
"else:\n", "else:\n",
" print('positive')" " print(\"positive\")"
] ]
}, },
{ {
@ -2116,14 +2131,14 @@
} }
], ],
"source": [ "source": [
"#print(cities)\n", "# print(cities)\n",
"for city in cities:\n", "for city in cities:\n",
" if city == \"Cairo\":\n", " if city == \"Cairo\":\n",
" # we don't need to print cairo out\n", " # we don't need to print cairo out\n",
" continue\n", " continue\n",
" print(city)\n", " print(city)\n",
" \n", "\n",
"seconds_left = 7\n" "seconds_left = 7"
] ]
}, },
{ {
@ -2160,7 +2175,7 @@
}, },
"outputs": [], "outputs": [],
"source": [ "source": [
"# break demo \n", "# break demo\n",
"\n", "\n",
"time_left = 10\n", "time_left = 10\n",
"abort_at = 3\n", "abort_at = 3\n",
@ -2172,7 +2187,7 @@
" print(\"Launch Aborted\")\n", " print(\"Launch Aborted\")\n",
" break\n", " break\n",
"else:\n", "else:\n",
" # this only runs if we don't break \n", " # this only runs if we don't break\n",
" print(\"blast off!\")\n", " print(\"blast off!\")\n",
"\n", "\n",
"# can we use else to fix this?\n", "# can we use else to fix this?\n",
@ -2197,8 +2212,7 @@
" print(\"found a comma!\")\n", " print(\"found a comma!\")\n",
" break\n", " break\n",
"else:\n", "else:\n",
" print('no comma found!')\n", " print(\"no comma found!\")"
" "
] ]
}, },
{ {
@ -2236,7 +2250,7 @@
" if city in visited:\n", " if city in visited:\n",
" continue\n", " continue\n",
" print(f\"I would like to visit {city}\")\n", " print(f\"I would like to visit {city}\")\n",
" \n", "\n",
"# when would we use continue in practice?" "# when would we use continue in practice?"
] ]
}, },
@ -2466,13 +2480,16 @@
"metadata": {}, "metadata": {},
"outputs": [], "outputs": [],
"source": [ "source": [
"# I've broken this function into multiple lines, which is allowed \n", "# I've broken this function into multiple lines, which is allowed\n",
"# due to the parentheses. \n", "# due to the parentheses.\n",
"\n",
"\n", "\n",
"def find_value(\n", "def find_value(\n",
" a_list: list[int], # this parameter is a list of integers\n", " a_list: list[int], # this parameter is a list of integers\n",
" num: int # this parameter is a single integer\n", " num: int, # this parameter is a single integer\n",
") -> int | None: # this annotation \"-> int | None\" indicates return type can be int or None\n", ") -> (\n",
" int | None\n",
"): # this annotation \"-> int | None\" indicates return type can be int or None\n",
" pass" " pass"
] ]
}, },

149
02.basics-2.ipynb
View file

@ -381,7 +381,7 @@
"tup = (1, 2, 3)\n", "tup = (1, 2, 3)\n",
"lst = [\"a\", \"b\", \"c\"]\n", "lst = [\"a\", \"b\", \"c\"]\n",
"\n", "\n",
"(x, y, z) = tup \n", "(x, y, z) = tup\n",
"print(x, y, z)" "print(x, y, z)"
] ]
}, },
@ -395,7 +395,7 @@
"outputs": [], "outputs": [],
"source": [ "source": [
"x = 7\n", "x = 7\n",
"y = 8 " "y = 8"
] ]
}, },
{ {
@ -495,7 +495,7 @@
"\n", "\n",
"# alternate form\n", "# alternate form\n",
"record2 = dict(age=42, name=\"Anna\")\n", "record2 = dict(age=42, name=\"Anna\")\n",
"#list(\"a\", \"b\")\n", "# list(\"a\", \"b\")\n",
"\n", "\n",
"# can also construct from sequence of tuples\n", "# can also construct from sequence of tuples\n",
"\n", "\n",
@ -549,7 +549,7 @@
}, },
"outputs": [], "outputs": [],
"source": [ "source": [
"record1[\"name\"] = \"Anne\"\n" "record1[\"name\"] = \"Anne\""
] ]
}, },
{ {
@ -592,8 +592,8 @@
"source": [ "source": [
"# keys, values, items\n", "# keys, values, items\n",
"print(record1.keys())\n", "print(record1.keys())\n",
"#print(record1.values())\n", "# print(record1.values())\n",
"#print((record1.items()))" "# print((record1.items()))"
] ]
}, },
{ {
@ -627,7 +627,7 @@
}, },
"outputs": [], "outputs": [],
"source": [ "source": [
"hash([1,2,3,4])" "hash([1, 2, 3, 4])"
] ]
}, },
{ {
@ -721,7 +721,7 @@
"outputs": [], "outputs": [],
"source": [ "source": [
"d2 = {}\n", "d2 = {}\n",
"d2[[1,2,3]] = \"OK\" " "d2[[1, 2, 3]] = \"OK\""
] ]
}, },
{ {
@ -877,8 +877,8 @@
"# can use .items() or .values() to loop over non-keys\n", "# can use .items() or .values() to loop over non-keys\n",
"for key, value in order.items():\n", "for key, value in order.items():\n",
" print(f\"{key=} {value=}\")\n", " print(f\"{key=} {value=}\")\n",
" \n", "\n",
" \n", "\n",
"print(order.items())" "print(order.items())"
] ]
}, },
@ -941,7 +941,7 @@
"print(order)\n", "print(order)\n",
"key = \"fish\"\n", "key = \"fish\"\n",
"\n", "\n",
"#print(d.get(key), key)\n" "# print(d.get(key), key)"
] ]
}, },
{ {
@ -1071,12 +1071,12 @@
} }
], ],
"source": [ "source": [
"dishes = {'eggs':2,'sausage':1,'bacon':1,'spam':500}\n", "dishes = {\"eggs\": 2, \"sausage\": 1, \"bacon\": 1, \"spam\": 500}\n",
"\n", "\n",
"# Keys is a view object of the keys from the dishes dictionary\n", "# Keys is a view object of the keys from the dishes dictionary\n",
"keys = dishes.keys()\n", "keys = dishes.keys()\n",
"values = dishes.values()\n", "values = dishes.values()\n",
"items = dishes.items() \n", "items = dishes.items()\n",
"\n", "\n",
"print(keys)\n", "print(keys)\n",
"print(values)\n", "print(values)\n",
@ -1104,12 +1104,12 @@
} }
], ],
"source": [ "source": [
"# View objects are dynamic and reflect dictionary changes \n", "# View objects are dynamic and reflect dictionary changes\n",
"\n", "\n",
"# Lets delete the 'eggs' entry \n", "# Lets delete the 'eggs' entry\n",
"del dishes['eggs']\n", "del dishes[\"eggs\"]\n",
"\n", "\n",
"# Notice the both the views have removed key and its value \n", "# Notice the both the views have removed key and its value\n",
"print(keys)\n", "print(keys)\n",
"print(values)\n", "print(values)\n",
"print(items)" "print(items)"
@ -1136,7 +1136,7 @@
"menu = {\n", "menu = {\n",
" \"Breakfast\": {\"Eggs\": 2.19, \"Toast\": 0.99, \"Orange Juice\": 1.99},\n", " \"Breakfast\": {\"Eggs\": 2.19, \"Toast\": 0.99, \"Orange Juice\": 1.99},\n",
" \"Lunch\": {\"BLT\": 3.99, \"Chicken\": 5.99, \"Salad\": 4.50},\n", " \"Lunch\": {\"BLT\": 3.99, \"Chicken\": 5.99, \"Salad\": 4.50},\n",
" \"Dinner\": {\"Cheeseburger\": 9.99, \"Salad\": 7.50, \"Special\": 8.49}\n", " \"Dinner\": {\"Cheeseburger\": 9.99, \"Salad\": 7.50, \"Special\": 8.49},\n",
"}\n", "}\n",
"\n", "\n",
"print(menu[\"Lunch\"])\n", "print(menu[\"Lunch\"])\n",
@ -1174,17 +1174,18 @@
"source": [ "source": [
"def something(d):\n", "def something(d):\n",
" to_remove = []\n", " to_remove = []\n",
" \n", "\n",
" #d_copy = d.copy()\n", " # d_copy = d.copy()\n",
" for k, v in d.items():\n", " for k, v in d.items():\n",
" if v < 50:\n", " if v < 50:\n",
" #d.pop(k)\n", " # d.pop(k)\n",
" to_remove.append(k)\n", " to_remove.append(k)\n",
" \n", "\n",
" for item in to_remove:\n", " for item in to_remove:\n",
" d.pop(item)\n", " d.pop(item)\n",
" #...\n", " # ...\n",
" \n", "\n",
"\n",
"scores = {\"A\": 100, \"B\": 20, \"C\": 48}\n", "scores = {\"A\": 100, \"B\": 20, \"C\": 48}\n",
"something(scores)\n", "something(scores)\n",
"print(scores)" "print(scores)"
@ -1205,7 +1206,7 @@
" to_remove.append(key)\n", " to_remove.append(key)\n",
"for key in to_remove:\n", "for key in to_remove:\n",
" d.pop(key)\n", " d.pop(key)\n",
" \n", "\n",
"print(d)" "print(d)"
] ]
}, },
@ -1232,7 +1233,7 @@
"below_60\n", "below_60\n",
"for name in below_60:\n", "for name in below_60:\n",
" students.pop(name)\n", " students.pop(name)\n",
" \n", "\n",
"print(students)" "print(students)"
] ]
}, },
@ -1385,9 +1386,9 @@
"metadata": {}, "metadata": {},
"outputs": [], "outputs": [],
"source": [ "source": [
"#The following creates a set of single strings 'a','b','c','d','e'\n", "# The following creates a set of single strings 'a','b','c','d','e'\n",
"# and another set of single strings 'b','d','x','y','z'\n", "# and another set of single strings 'b','d','x','y','z'\n",
"A = set('abcde')\n", "A = set(\"abcde\")\n",
"B = set([\"b\", \"d\", \"x\", \"y\", \"z\"])\n", "B = set([\"b\", \"d\", \"x\", \"y\", \"z\"])\n",
"\n", "\n",
"print(\"A = \", A)\n", "print(\"A = \", A)\n",
@ -1406,11 +1407,11 @@
}, },
"outputs": [], "outputs": [],
"source": [ "source": [
"# Union Operation \n", "# Union Operation\n",
"new_set = A | B \n", "new_set = A | B\n",
"print(new_set)\n", "print(new_set)\n",
"print('---')\n", "print(\"---\")\n",
"new_set = A.union(B) # Same operation as above but using method \n", "new_set = A.union(B) # Same operation as above but using method\n",
"print(new_set)" "print(new_set)"
] ]
}, },
@ -1425,8 +1426,8 @@
}, },
"outputs": [], "outputs": [],
"source": [ "source": [
"# Difference Operation \n", "# Difference Operation\n",
"new_set = A - B \n", "new_set = A - B\n",
"print(new_set)\n", "print(new_set)\n",
"print(\"---\")\n", "print(\"---\")\n",
"new_set = B.difference(A) # note that order matters for difference\n", "new_set = B.difference(A) # note that order matters for difference\n",
@ -1444,11 +1445,11 @@
}, },
"outputs": [], "outputs": [],
"source": [ "source": [
"# Intersection Operation \n", "# Intersection Operation\n",
"new_set = A & B \n", "new_set = A & B\n",
"print(new_set)\n", "print(new_set)\n",
"print('---')\n", "print(\"---\")\n",
"new_set = A.intersection(B) # same operation as above but using method \n", "new_set = A.intersection(B) # same operation as above but using method\n",
"print(new_set)" "print(new_set)"
] ]
}, },
@ -1463,11 +1464,11 @@
}, },
"outputs": [], "outputs": [],
"source": [ "source": [
"# Symmetric Difference Operation \n", "# Symmetric Difference Operation\n",
"new_set = A ^ B \n", "new_set = A ^ B\n",
"print(new_set)\n", "print(new_set)\n",
"print('---')\n", "print(\"---\")\n",
"new_set = A.symmetric_difference(B) # same operation as above but using method \n", "new_set = A.symmetric_difference(B) # same operation as above but using method\n",
"print(new_set)" "print(new_set)"
] ]
}, },
@ -1557,7 +1558,7 @@
"outputs": [], "outputs": [],
"source": [ "source": [
"s.discard(\"9\")\n", "s.discard(\"9\")\n",
"#print(\"Discarded Ace\")\n", "# print(\"Discarded Ace\")\n",
"print(s)" "print(s)"
] ]
}, },
@ -1585,8 +1586,16 @@
"print(s)\n", "print(s)\n",
"\n", "\n",
"\n", "\n",
"\n", "\"Honda Civic\" in [\n",
"\"Honda Civic\" in [\"Honda Civic\", \"Ford Focus\", \"Honda Civic\", \"Honda Civic\", \"Honda Civic\", \"Honda Civic\", \"Honda Civic\", \"Escalade\"]" " \"Honda Civic\",\n",
" \"Ford Focus\",\n",
" \"Honda Civic\",\n",
" \"Honda Civic\",\n",
" \"Honda Civic\",\n",
" \"Honda Civic\",\n",
" \"Honda Civic\",\n",
" \"Escalade\",\n",
"]"
] ]
}, },
{ {
@ -1642,7 +1651,6 @@
"metadata": {}, "metadata": {},
"outputs": [], "outputs": [],
"source": [ "source": [
"\n",
"students = [\n", "students = [\n",
" {\"name\": \"adam\", \"num\": 123},\n", " {\"name\": \"adam\", \"num\": 123},\n",
" {\"name\": \"quynh\", \"num\": 456},\n", " {\"name\": \"quynh\", \"num\": 456},\n",
@ -1720,7 +1728,7 @@
"\n", "\n",
"print(nested)\n", "print(nested)\n",
"\n", "\n",
"#frozen_nums.add(4)" "# frozen_nums.add(4)"
] ]
}, },
{ {
@ -1837,7 +1845,7 @@
"# str\n", "# str\n",
"s = \"Hello\"\n", "s = \"Hello\"\n",
"s = s + \" World\"\n", "s = s + \" World\"\n",
"s \n", "s\n",
"\n", "\n",
"# how did s change?" "# how did s change?"
] ]
@ -2292,10 +2300,10 @@
} }
], ],
"source": [ "source": [
"fruit1 = ('Apples', 4)\n", "fruit1 = (\"Apples\", 4)\n",
"fruit2 = ('Apples', 4)\n", "fruit2 = (\"Apples\", 4)\n",
"fruit3 = fruit2\n", "fruit3 = fruit2\n",
"print(f'Fruit1 id = {id(fruit1)} \\n Fruit2 id = {id(fruit2)}')\n", "print(f\"Fruit1 id = {id(fruit1)} \\n Fruit2 id = {id(fruit2)}\")\n",
"print(f\"Fruit3 id= {id(fruit3)}\")" "print(f\"Fruit3 id= {id(fruit3)}\")"
] ]
}, },
@ -2335,7 +2343,7 @@
"\n", "\n",
"print(id(a))\n", "print(id(a))\n",
"print(id(b))\n", "print(id(b))\n",
"print(\"a is b\", a is b) # The id values are different " "print(\"a is b\", a is b) # The id values are different"
] ]
}, },
{ {
@ -2442,14 +2450,14 @@
"b = 1000\n", "b = 1000\n",
"\n", "\n",
"# Two different objects, two different ids.\n", "# Two different objects, two different ids.\n",
"print(a is b) \n", "print(a is b)\n",
"\n", "\n",
"#a = 100\n", "# a = 100\n",
"#b = 100\n", "# b = 100\n",
"\n", "\n",
"# However, for small integer objects, CPython caches them \n", "# However, for small integer objects, CPython caches them\n",
"# this means that a and b point to the same object \n", "# this means that a and b point to the same object\n",
"#print(a is b)\n", "# print(a is b)\n",
"\n", "\n",
"for i in range(200, 300):\n", "for i in range(200, 300):\n",
" print(i, i is i)" " print(i, i is i)"
@ -2484,11 +2492,11 @@
} }
], ],
"source": [ "source": [
"# CPython does the same for short strings \n", "# CPython does the same for short strings\n",
"str1 = 'MPCS' * 100\n", "str1 = \"MPCS\" * 100\n",
"str2 = 'MPCS' * 100\n", "str2 = \"MPCS\" * 100\n",
"print(id(str1), id(str2))\n", "print(id(str1), id(str2))\n",
"str1 is str2 " "str1 is str2"
] ]
}, },
{ {
@ -2548,17 +2556,17 @@
} }
], ],
"source": [ "source": [
"# shallow copy example \n", "# shallow copy example\n",
"\n", "\n",
"x = [[1, 2], [3, 4]]\n", "x = [[1, 2], [3, 4]]\n",
"y = x.copy() # or copy.copy(x)\n", "y = x.copy() # or copy.copy(x)\n",
"\n", "\n",
"print(\"x is y\", x is y)\n", "print(\"x is y\", x is y)\n",
"print(\"x[0] is y[0]\", x[0] is y[0]) \n", "print(\"x[0] is y[0]\", x[0] is y[0])\n",
"\n", "\n",
"#print(x, y)\n", "# print(x, y)\n",
"x[0].append(5)\n", "x[0].append(5)\n",
"print(x, \"\\n\", y)\n" "print(x, \"\\n\", y)"
] ]
}, },
{ {
@ -2582,6 +2590,7 @@
"source": [ "source": [
"# deep copy\n", "# deep copy\n",
"import copy\n", "import copy\n",
"\n",
"# copy.copy(obj) --> same as obj.copy()\n", "# copy.copy(obj) --> same as obj.copy()\n",
"z = copy.deepcopy(x)\n", "z = copy.deepcopy(x)\n",
"print(\"x[0] is z[0]\", x[0] is z[0])" "print(\"x[0] is z[0]\", x[0] is z[0])"
@ -2980,7 +2989,7 @@
"emails = []\n", "emails = []\n",
"with open(\"data/emails.txt\") as f:\n", "with open(\"data/emails.txt\") as f:\n",
" for email in f:\n", " for email in f:\n",
" emails.append(email) \n", " emails.append(email)\n",
"print(emails)" "print(emails)"
] ]
}, },
@ -3010,10 +3019,10 @@
"with open(\"data/cnetids.txt\", \"w\") as f:\n", "with open(\"data/cnetids.txt\", \"w\") as f:\n",
" for cnet_id in cnet_ids:\n", " for cnet_id in cnet_ids:\n",
" # print() adds newlines by default\n", " # print() adds newlines by default\n",
" print(cnet_id, file=f) \n", " print(cnet_id, file=f)\n",
" # or\n", " # or\n",
" #f.write(cnet_id + \"\\n\")\n", " # f.write(cnet_id + \"\\n\")\n",
" \n", "\n",
"!cat data/cnetids.txt" "!cat data/cnetids.txt"
] ]
}, },

1
pyproject.toml
View file

@ -6,4 +6,5 @@ readme = "README.md"
requires-python = ">=3.10" requires-python = ">=3.10"
dependencies = [ dependencies = [
"jupyter>=1.1.1", "jupyter>=1.1.1",
"ruff>=0.6.8",
] ]

31
uv.lock
View file

@ -7,10 +7,14 @@ version = "0.1.0"
source = { virtual = "." } source = { virtual = "." }
dependencies = [ dependencies = [
{ name = "jupyter" }, { name = "jupyter" },
{ name = "ruff" },
] ]
[package.metadata] [package.metadata]
requires-dist = [{ name = "jupyter", specifier = ">=1.1.1" }] requires-dist = [
{ name = "jupyter", specifier = ">=1.1.1" },
{ name = "ruff", specifier = ">=0.6.8" },
]
[[package]] [[package]]
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