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269 changes: 241 additions & 28 deletions for-loops.ipynb
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Original file line number Diff line number Diff line change
Expand Up @@ -22,9 +22,19 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 2,
"metadata": {},
"outputs": [],
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"odysseus\n",
"neoptolemus\n",
"philoctetes\n"
]
}
],
"source": [
"cast = [\"odysseus\", \"neoptolemus\", \"philoctetes\"]\n",
"\n",
Expand All @@ -38,7 +48,7 @@
"source": [
"Let's break this down:\n",
"\n",
"1. `cast = [\"Odysseus\", \"Neoptolemus\", \"Philoctetes\"]` declares a variable and assigns to it the list containing the `str`-names of the main cast of Sophocles' _Philoctetes_.\n",
"1. `cast = [\"odysseus\", \"neoptolemus\", \"philoctetes\"]` declares a variable and assigns to it the list containing the `str`-names of the main cast of Sophocles' _Philoctetes_.\n",
"2. `for character in cast:` opens a `for` loop, assigning each item in `cast` to the variable `character` — which is only defined inside the loop. The name `character` is unimportant — you could us any valid Pyhon variable. But it's good practice to use names that are descriptive of the contents.\n",
"3. ` print(character)` prints the `str`-name of each `character`. Notice the indentation!\n",
"\n",
Expand All @@ -47,11 +57,24 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 7,
"metadata": {},
"outputs": [],
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Odysseus text text text\n",
"Neoptolemus text text text\n",
"Philoctetes text text text\n"
]
}
],
"source": [
"# Hint: Use print(f\"{variable}\")"
"# Hint: Use print(f\"{variable}\")\n",
"\n",
"for character in cast:\n",
" print(f\"{character.title()} text text text\")"
]
},
{
Expand All @@ -63,9 +86,20 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 3,
"metadata": {},
"outputs": [],
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"odysseus\n",
"neoptolemus\n",
"philoctetes\n",
"And now the loop is done!\n"
]
}
],
"source": [
"cast = [\"odysseus\", \"neoptolemus\", \"philoctetes\"]\n",
"\n",
Expand All @@ -86,9 +120,18 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 4,
"metadata": {},
"outputs": [],
"outputs": [
{
"ename": "IndentationError",
"evalue": "expected an indented block after 'for' statement on line 3 (3799840020.py, line 4)",
"output_type": "error",
"traceback": [
"\u001b[0;36m Cell \u001b[0;32mIn[4], line 4\u001b[0;36m\u001b[0m\n\u001b[0;31m print(character)\u001b[0m\n\u001b[0m ^\u001b[0m\n\u001b[0;31mIndentationError\u001b[0m\u001b[0;31m:\u001b[0m expected an indented block after 'for' statement on line 3\n"
]
}
],
"source": [
"cast = [\"odysseus\", \"neoptolemus\", \"philoctetes\"]\n",
"\n",
Expand All @@ -107,9 +150,22 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 5,
"metadata": {},
"outputs": [],
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"odysseus\n",
"And now the loop is done!\n",
"neoptolemus\n",
"And now the loop is done!\n",
"philoctetes\n",
"And now the loop is done!\n"
]
}
],
"source": [
"cast = [\"odysseus\", \"neoptolemus\", \"philoctetes\"]\n",
"\n",
Expand All @@ -128,16 +184,29 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 9,
"metadata": {},
"outputs": [],
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"odysseus\n",
"neoptolemus\n",
"philoctetes\n",
"philoctetes was played by a great actor!\n"
]
}
],
"source": [
"cast = [\"odysseus\", \"neoptolemus\", \"philoctetes\"]\n",
"\n",
"last_actor_seen = None\n",
"for character in cast:\n",
" last_actor_seen = character\n",
" print(character)\n",
"\n",
"print(f\"{character} was played by a great actor!\")"
"print(f\"{last_actor_seen} was played by a great actor!\")"
]
},
{
Expand All @@ -158,9 +227,20 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 10,
"metadata": {},
"outputs": [],
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"1 is greater than 0\n",
"2 is greater than 1\n",
"3 is greater than 2\n",
"4 is greater than 3\n"
]
}
],
"source": [
"for value in range(1, 5):\n",
" print(f\"{value} is greater than {value - 1}\")"
Expand All @@ -175,19 +255,41 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 11,
"metadata": {},
"outputs": [],
"outputs": [
{
"data": {
"text/plain": [
"[0, 2, 4, 6, 8]"
]
},
"execution_count": 11,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"# We can use the third argument to adjust the size of each step\n",
"list(range(0, 10, 2))"
]
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 12,
"metadata": {},
"outputs": [],
"outputs": [
{
"data": {
"text/plain": [
"[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]"
]
},
"execution_count": 12,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"# Or we can pass `range()` just one argument, and it will start from 0:\n",
"list(range(10))"
Expand All @@ -204,9 +306,20 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 13,
"metadata": {},
"outputs": [],
"outputs": [
{
"data": {
"text/plain": [
"[2, 3, 4, 5, 6]"
]
},
"execution_count": 13,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"[value+2 for value in range(0, 5)]"
]
Expand All @@ -229,11 +342,21 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 14,
"metadata": {},
"outputs": [],
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"[2, 3, 4, 5, 6, 7]\n",
"[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18]\n",
"[15, 16, 17, 18, 19]\n"
]
}
],
"source": [
"numbers = list(range(0, 20))\n",
"numbers = list(range(0, 20)) - right is exclusive so this goes from 0 to 19\n",
"\n",
"print(numbers[2:8])\n",
"\n",
Expand Down Expand Up @@ -304,11 +427,101 @@
"\n",
"Matthes 2023, p. 67, Exercise 4-13."
]
},
{
"cell_type": "code",
"execution_count": 3,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"('eggs', 'pancakes', 'waffles', 'chicken fingers', 'mac n cheese')"
]
},
"execution_count": 3,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"my_tuple = ('eggs', 'pancakes', 'waffles', 'chicken fingers', 'mac n cheese')\n",
"my_tuple"
]
},
{
"cell_type": "code",
"execution_count": 4,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"eggs\n",
"pancakes\n",
"waffles\n",
"chicken fingers\n",
"mac n cheese\n"
]
}
],
"source": [
"for food in my_tuple:\n",
" print(food)"
]
},
{
"cell_type": "code",
"execution_count": 17,
"metadata": {},
"outputs": [
{
"ename": "AttributeError",
"evalue": "'tuple' object has no attribute 'append'",
"output_type": "error",
"traceback": [
"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
"\u001b[0;31mAttributeError\u001b[0m Traceback (most recent call last)",
"Cell \u001b[0;32mIn[17], line 1\u001b[0m\n\u001b[0;32m----> 1\u001b[0m \u001b[43mmy_tuple\u001b[49m\u001b[38;5;241;43m.\u001b[39;49m\u001b[43mappend\u001b[49m(\u001b[38;5;124m'\u001b[39m\u001b[38;5;124mburger\u001b[39m\u001b[38;5;124m'\u001b[39m, \u001b[38;5;124m'\u001b[39m\u001b[38;5;124mhot dogs\u001b[39m\u001b[38;5;124m'\u001b[39m)\n",
"\u001b[0;31mAttributeError\u001b[0m: 'tuple' object has no attribute 'append'"
]
}
],
"source": [
"my_tuple.append('burger', 'hot dogs')"
]
},
{
"cell_type": "code",
"execution_count": 16,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"\n",
"Modified food:\n",
"burger\n",
"hot dogs\n",
"waffles\n",
"chicken fingers\n",
"mac n cheese\n"
]
}
],
"source": [
"my_tuple = ('burger', 'hot dogs', 'waffles', 'chicken fingers', 'mac n cheese')\n",
"print(\"\\nModified food:\")\n",
"for food in my_tuple:\n",
" print(food)\n"
]
}
],
"metadata": {
"kernelspec": {
"display_name": ".venv",
"display_name": "Python 3",
"language": "python",
"name": "python3"
},
Expand All @@ -322,7 +535,7 @@
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.12.7"
"version": "3.12.1"
}
},
"nbformat": 4,
Expand Down