1056 lines
20 KiB
Plaintext
1056 lines
20 KiB
Plaintext
{
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"cells": [
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{
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"cell_type": "markdown",
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"id": "2663b868-8c7e-4776-9c3b-0cc03d581ee5",
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"metadata": {},
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"source": [
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"## Generators & Comprehensions\n",
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"\n",
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"### Generator Functions\n",
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"\n",
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"A generator function works differently from all of the functions we've seen before. It allows the function to return (using the `yield` statement) and resume where it left off, with internal state intact.\n",
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"\n",
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"Between calls to the generator function, state is suspended."
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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": 1,
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"id": "f6f883d1-88fd-4488-8af7-17c15a47e933",
|
|
"metadata": {},
|
|
"outputs": [],
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"source": [
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"def simple_generator_func():\n",
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" print(\"start\")\n",
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" yield 1\n",
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" print(\"still running\")\n",
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" yield 2\n",
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" print(\"one more\")\n",
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" yield 3"
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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": 4,
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|
"id": "2260b250-1ae6-4d3b-ab05-314ddad19256",
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"generator"
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]
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},
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"execution_count": 4,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"# return type of a yielding function is a generator\n",
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"type(simple_generator_func())"
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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": 10,
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"id": "c051b45d-9a37-4086-b90c-2090110c8cc6",
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"metadata": {
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"tags": []
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},
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"outputs": [],
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"source": [
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"g = simple_generator_func()"
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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": 11,
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"id": "0d55a761-1496-46dc-bafe-4eb121ad0ca7",
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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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"start\n",
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"value from generator = 1\n",
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"between loops\n",
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"still running\n",
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"2\n",
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"one more\n",
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"3\n"
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]
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}
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],
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"source": [
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"for x in g:\n",
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" print(\"value from generator = \", x)\n",
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" break\n",
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"print(\"between loops\")\n",
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"for x in g:\n",
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" print(x)"
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]
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},
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{
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|
"cell_type": "markdown",
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|
"id": "427fe881-459e-4a20-acfa-dae65a1b906c",
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"metadata": {
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|
"tags": []
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|
},
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"source": [
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"##"
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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": 15,
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"id": "6a87d7d2-9eb5-4415-9770-79d9594aafa5",
|
|
"metadata": {},
|
|
"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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"start\n",
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"yielded value= 1\n",
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"still running\n",
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"yielded value= 2\n",
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"one more\n",
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"next= 3\n"
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]
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}
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|
],
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"source": [
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"g = simple_generator_func()\n",
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"for x in g:\n",
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" print(\"yielded value=\", x)\n",
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" if x == 2:\n",
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" break\n",
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"\n",
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"print(\"next=\", next(g))"
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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": 16,
|
|
"id": "544d5a37-a1c0-47f6-b270-429ea2215386",
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|
"metadata": {},
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"outputs": [],
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"source": [
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"def evens_up_to(n): \n",
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" for i in range(2, n + 1):\n",
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" if i % 2 == 0:\n",
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" yield i"
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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": 19,
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|
"id": "7fbc6cf5-0995-4d20-b47d-6b5454899168",
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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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"2\n",
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"4\n",
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"6\n",
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"8\n",
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"10\n",
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"12\n",
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"14\n",
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"16\n",
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"18\n",
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"20\n",
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"22\n",
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"24\n",
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"26\n",
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"28\n",
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"30\n",
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"32\n",
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"34\n",
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"36\n",
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"38\n",
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"40\n",
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"42\n"
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]
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}
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],
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"source": [
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"#n = 0\n",
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"for evens in evens_up_to(2000000000000000000):\n",
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" # n += 1\n",
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" print(evens)\n",
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" if evens > 40:\n",
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" break"
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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": 24,
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"id": "5af8b087-6b63-4948-811d-5ba4e0a8ba55",
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"range(0, 100000000000000000000)"
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]
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},
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"execution_count": 24,
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"metadata": {},
|
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"output_type": "execute_result"
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}
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],
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"source": [
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"list(range(100000000000000000000))"
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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": 25,
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|
"id": "2fbf706b-6f6c-4a24-890e-10121d709582",
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"metadata": {},
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|
"outputs": [],
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"source": [
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"# Generators do not have to ever exit, here is an infinite generator\n",
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"def powers_of_two():\n",
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" n = 2\n",
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" while True:\n",
|
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" yield n\n",
|
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" n *= 2"
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|
]
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},
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|
{
|
|
"cell_type": "code",
|
|
"execution_count": null,
|
|
"id": "32920b91-7b00-4b2a-8927-07bd5cbc6fa2",
|
|
"metadata": {},
|
|
"outputs": [],
|
|
"source": [
|
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"list(powers_of_two())"
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|
]
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|
},
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|
{
|
|
"cell_type": "code",
|
|
"execution_count": 26,
|
|
"id": "27a8bd75-3912-4f97-9655-763279f07f9b",
|
|
"metadata": {},
|
|
"outputs": [
|
|
{
|
|
"name": "stdout",
|
|
"output_type": "stream",
|
|
"text": [
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|
"2\n",
|
|
"4\n",
|
|
"8\n",
|
|
"16\n",
|
|
"32\n",
|
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"64\n"
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]
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|
}
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|
],
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"source": [
|
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"for x in powers_of_two():\n",
|
|
" if x > 100:\n",
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" break\n",
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" print(x)"
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|
]
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|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 27,
|
|
"id": "5c3b2178-65fc-43d2-8940-d91bf58e1881",
|
|
"metadata": {},
|
|
"outputs": [],
|
|
"source": [
|
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"g = powers_of_two()"
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|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 41,
|
|
"id": "396ce187-a2e3-4611-a188-9403f17cba34",
|
|
"metadata": {},
|
|
"outputs": [
|
|
{
|
|
"data": {
|
|
"text/plain": [
|
|
"16384"
|
|
]
|
|
},
|
|
"execution_count": 41,
|
|
"metadata": {},
|
|
"output_type": "execute_result"
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|
}
|
|
],
|
|
"source": [
|
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"next(g)"
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|
]
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|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": null,
|
|
"id": "dd4f4d70-e74a-43d3-88bc-7dfe04add2a2",
|
|
"metadata": {
|
|
"tags": []
|
|
},
|
|
"outputs": [],
|
|
"source": [
|
|
"for x in range(100000000000000000000000000000000):\n",
|
|
" if x > 5:\n",
|
|
" break\n",
|
|
" print(x)"
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|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": null,
|
|
"id": "c5ba1490-5fe1-4120-95a0-f60f85559959",
|
|
"metadata": {},
|
|
"outputs": [],
|
|
"source": [
|
|
"y = list(range(100000))"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": null,
|
|
"id": "fb4db8a4-36da-4d56-b8bd-c10b6e01fc73",
|
|
"metadata": {},
|
|
"outputs": [],
|
|
"source": [
|
|
"len(y)"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 65,
|
|
"id": "9be584c1-4cf9-4ad3-88ab-4b5da18e42da",
|
|
"metadata": {},
|
|
"outputs": [],
|
|
"source": [
|
|
"g = powers_of_two()\n",
|
|
"h = powers_of_two()\n",
|
|
"k = h"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 43,
|
|
"id": "81095f30-547f-4624-b2a4-9cc5997c4a8b",
|
|
"metadata": {
|
|
"tags": []
|
|
},
|
|
"outputs": [
|
|
{
|
|
"data": {
|
|
"text/plain": [
|
|
"True"
|
|
]
|
|
},
|
|
"execution_count": 43,
|
|
"metadata": {},
|
|
"output_type": "execute_result"
|
|
}
|
|
],
|
|
"source": [
|
|
"g is not h"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 77,
|
|
"id": "c9a9fa0a-e699-4a56-9e9a-cd7e07f1a446",
|
|
"metadata": {},
|
|
"outputs": [
|
|
{
|
|
"data": {
|
|
"text/plain": [
|
|
"128"
|
|
]
|
|
},
|
|
"execution_count": 77,
|
|
"metadata": {},
|
|
"output_type": "execute_result"
|
|
}
|
|
],
|
|
"source": [
|
|
"next(h)"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 78,
|
|
"id": "9b019479-cb3a-41b4-8ef8-a62e61b56430",
|
|
"metadata": {},
|
|
"outputs": [
|
|
{
|
|
"data": {
|
|
"text/plain": [
|
|
"256"
|
|
]
|
|
},
|
|
"execution_count": 78,
|
|
"metadata": {},
|
|
"output_type": "execute_result"
|
|
}
|
|
],
|
|
"source": [
|
|
"next(k)"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 44,
|
|
"id": "07cb4313-a300-47c3-b873-b074399a2fad",
|
|
"metadata": {},
|
|
"outputs": [
|
|
{
|
|
"data": {
|
|
"text/plain": [
|
|
"4427895344"
|
|
]
|
|
},
|
|
"execution_count": 44,
|
|
"metadata": {},
|
|
"output_type": "execute_result"
|
|
}
|
|
],
|
|
"source": [
|
|
"id(g)\n"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 45,
|
|
"id": "3e2ea606-1041-4171-9096-837fe1eaacdd",
|
|
"metadata": {},
|
|
"outputs": [
|
|
{
|
|
"data": {
|
|
"text/plain": [
|
|
"4427893440"
|
|
]
|
|
},
|
|
"execution_count": 45,
|
|
"metadata": {},
|
|
"output_type": "execute_result"
|
|
}
|
|
],
|
|
"source": [
|
|
"id(h)"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 62,
|
|
"id": "e34470cd-efdd-45d0-a1b5-58e478260e4c",
|
|
"metadata": {},
|
|
"outputs": [
|
|
{
|
|
"data": {
|
|
"text/plain": [
|
|
"4096"
|
|
]
|
|
},
|
|
"execution_count": 62,
|
|
"metadata": {},
|
|
"output_type": "execute_result"
|
|
}
|
|
],
|
|
"source": [
|
|
"next(g)"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 64,
|
|
"id": "2e656696-8e3e-4dfd-86f9-9b87a08debe3",
|
|
"metadata": {
|
|
"tags": []
|
|
},
|
|
"outputs": [
|
|
{
|
|
"data": {
|
|
"text/plain": [
|
|
"128"
|
|
]
|
|
},
|
|
"execution_count": 64,
|
|
"metadata": {},
|
|
"output_type": "execute_result"
|
|
}
|
|
],
|
|
"source": [
|
|
"next(h)"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": null,
|
|
"id": "39b39657-243c-4641-9859-90fdb7adb3fc",
|
|
"metadata": {},
|
|
"outputs": [],
|
|
"source": [
|
|
"r = range(100)\n",
|
|
"print(r)"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": null,
|
|
"id": "1f746d52-4f7f-4a97-aaeb-330e99aaf722",
|
|
"metadata": {},
|
|
"outputs": [],
|
|
"source": [
|
|
"# what happens if the parameter changes during iteration?\n",
|
|
"def gen_test(param):\n",
|
|
" # param = ...bound...\n",
|
|
" i = 0\n",
|
|
" while i < param:\n",
|
|
" yield i\n",
|
|
" i += 1\n",
|
|
"\n",
|
|
"bound = 5\n",
|
|
"for x in gen_test(bound):\n",
|
|
" print(\"x is \", x, \"bound is\", bound)\n",
|
|
" bound.append(4)"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": null,
|
|
"id": "66d6ae08-da37-4f90-8a77-db08205c3b17",
|
|
"metadata": {},
|
|
"outputs": [],
|
|
"source": [
|
|
"def gen_test2():\n",
|
|
" yield 1\n",
|
|
" yield 2\n",
|
|
" yield 3"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": null,
|
|
"id": "88b2aaee-b02e-44f5-8a12-2ba2a539978c",
|
|
"metadata": {},
|
|
"outputs": [],
|
|
"source": [
|
|
"g = gen_test2()\n",
|
|
"next(g)"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": null,
|
|
"id": "1e47ea06-b792-415c-9af9-a850b82b3c95",
|
|
"metadata": {},
|
|
"outputs": [],
|
|
"source": [
|
|
"next(g)"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": null,
|
|
"id": "2a7803f2-4751-4f41-b1e4-04a212da71aa",
|
|
"metadata": {},
|
|
"outputs": [],
|
|
"source": [
|
|
"next(g)"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": null,
|
|
"id": "d8081044-cab9-4cd3-9f03-d50fc5ad1362",
|
|
"metadata": {},
|
|
"outputs": [],
|
|
"source": [
|
|
"next(g)"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": null,
|
|
"id": "40156c07-49d1-4753-9f26-0fe2481e9a42",
|
|
"metadata": {},
|
|
"outputs": [],
|
|
"source": [
|
|
"x = [1, 2, 3]"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": null,
|
|
"id": "ee0103a6-daf2-457b-af6a-913d7fdb9f92",
|
|
"metadata": {},
|
|
"outputs": [],
|
|
"source": [
|
|
"g = iter(x)"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": null,
|
|
"id": "c6d86fd8-a441-48c2-847e-e56b576102ae",
|
|
"metadata": {},
|
|
"outputs": [],
|
|
"source": [
|
|
"def newrange(lower_bound, upper_bound):\n",
|
|
" i = lower_bound\n",
|
|
" while i < upper_bound:\n",
|
|
" yield i\n",
|
|
" i += 1"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "markdown",
|
|
"id": "308fc5a9-78ac-40cd-afac-970614e9460e",
|
|
"metadata": {},
|
|
"source": [
|
|
"### Discussion: Benefits of Generators"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "markdown",
|
|
"id": "4fefa3b8-0727-4586-97df-698b91d91c6f",
|
|
"metadata": {},
|
|
"source": [
|
|
"- Avoids creating entire collections up front.\n",
|
|
"\n",
|
|
"- Can result in drastic memory savings.\n",
|
|
"\n",
|
|
" - How much memory does `range(100000)` need?\n",
|
|
"\n",
|
|
"- Avoids doing expensive computations until necessary."
|
|
]
|
|
},
|
|
{
|
|
"attachments": {},
|
|
"cell_type": "markdown",
|
|
"id": "229fa10f-331e-4b72-959e-d28b952760ee",
|
|
"metadata": {},
|
|
"source": [
|
|
"### Generator Expressions / Comprehensions\n",
|
|
"\n",
|
|
"Exact same syntax as a list comprehension, but results in a generator object.\n",
|
|
"\n",
|
|
"\n",
|
|
"```python\n",
|
|
"g = (expression for var in iterable)\n",
|
|
"\n",
|
|
"# or \n",
|
|
"\n",
|
|
"g = (expression for var in iterable if condition)\n",
|
|
"```\n",
|
|
"\n",
|
|
"Creates a generator that yields `expression` for each iteration of the for loop. (Optionally only if the `condition` is satisfied)\n",
|
|
"\n",
|
|
"Equivalent to:\n",
|
|
"\n",
|
|
"```python\n",
|
|
"def gf():\n",
|
|
" for var in iterable:\n",
|
|
" if condition:\n",
|
|
" yield expression\n",
|
|
"g = gf()\n",
|
|
"```"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 79,
|
|
"id": "aa9b4c18-3d73-4d9c-8e78-3dba56b4a717",
|
|
"metadata": {},
|
|
"outputs": [
|
|
{
|
|
"name": "stdout",
|
|
"output_type": "stream",
|
|
"text": [
|
|
"<generator object <genexpr> at 0x107ec63b0>\n"
|
|
]
|
|
}
|
|
],
|
|
"source": [
|
|
"pow_generator = (i + 1 for i in powers_of_two())\n",
|
|
"print(pow_generator)"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": null,
|
|
"id": "2e69c9d6-11ec-4e01-9116-95f55c8c2c7e",
|
|
"metadata": {
|
|
"tags": []
|
|
},
|
|
"outputs": [],
|
|
"source": []
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 80,
|
|
"id": "729f6476-491a-4daf-b460-23f602ef18fa",
|
|
"metadata": {},
|
|
"outputs": [
|
|
{
|
|
"name": "stdout",
|
|
"output_type": "stream",
|
|
"text": [
|
|
"3\n",
|
|
"5\n",
|
|
"9\n",
|
|
"17\n",
|
|
"33\n",
|
|
"65\n",
|
|
"129\n",
|
|
"257\n",
|
|
"513\n",
|
|
"1025\n",
|
|
"2049\n",
|
|
"4097\n",
|
|
"8193\n",
|
|
"16385\n",
|
|
"32769\n",
|
|
"65537\n",
|
|
"131073\n",
|
|
"262145\n",
|
|
"524289\n",
|
|
"1048577\n"
|
|
]
|
|
}
|
|
],
|
|
"source": [
|
|
"# can be used just like other generators we've seen (as an iterable)\n",
|
|
"for i in pow_generator:\n",
|
|
" print(i)\n",
|
|
" # will run forever without this\n",
|
|
" if i > 1000000:\n",
|
|
" break"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 81,
|
|
"id": "cfed52c0-0467-4b50-ac6c-66d6fa694ec6",
|
|
"metadata": {
|
|
"tags": []
|
|
},
|
|
"outputs": [
|
|
{
|
|
"name": "stdout",
|
|
"output_type": "stream",
|
|
"text": [
|
|
"2097153\n",
|
|
"4194305\n",
|
|
"8388609\n",
|
|
"16777217\n"
|
|
]
|
|
}
|
|
],
|
|
"source": [
|
|
"for x in pow_generator:\n",
|
|
" print(x) # can resume the generator\n",
|
|
" if x > 10000000:\n",
|
|
" break"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 89,
|
|
"id": "386c0eea-ea29-48bf-ba1b-dc174f340f18",
|
|
"metadata": {},
|
|
"outputs": [
|
|
{
|
|
"data": {
|
|
"text/plain": [
|
|
"4294967297"
|
|
]
|
|
},
|
|
"execution_count": 89,
|
|
"metadata": {},
|
|
"output_type": "execute_result"
|
|
}
|
|
],
|
|
"source": [
|
|
"next(pow_generator)"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 91,
|
|
"id": "ac1be105-edc6-4b52-8715-e54c186861d2",
|
|
"metadata": {},
|
|
"outputs": [
|
|
{
|
|
"data": {
|
|
"text/plain": [
|
|
"[0, 4, 16, 36, 64]"
|
|
]
|
|
},
|
|
"execution_count": 91,
|
|
"metadata": {},
|
|
"output_type": "execute_result"
|
|
}
|
|
],
|
|
"source": [
|
|
"# also possible to specify conditionals in generator expression, same as comprehension\n",
|
|
"gen2 = (i**2 for i in range(10) if i % 2 == 0)\n",
|
|
"list(gen2)"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 92,
|
|
"id": "c721ff55-86ac-46b1-826f-4613905162c8",
|
|
"metadata": {
|
|
"tags": []
|
|
},
|
|
"outputs": [],
|
|
"source": [
|
|
"# equivalent with map & filter\n",
|
|
"ll = range(10)\n",
|
|
"g = map(lambda x: x**2, filter(lambda x: x % 2 == 0, ll))"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 93,
|
|
"id": "a5aba588-3823-4763-b1ab-5a6217f72f8e",
|
|
"metadata": {
|
|
"tags": []
|
|
},
|
|
"outputs": [
|
|
{
|
|
"data": {
|
|
"text/plain": [
|
|
"0"
|
|
]
|
|
},
|
|
"execution_count": 93,
|
|
"metadata": {},
|
|
"output_type": "execute_result"
|
|
}
|
|
],
|
|
"source": [
|
|
"next(g)"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 94,
|
|
"id": "2452f706-096d-4bca-aae7-cc6564e48a23",
|
|
"metadata": {},
|
|
"outputs": [
|
|
{
|
|
"data": {
|
|
"text/plain": [
|
|
"4"
|
|
]
|
|
},
|
|
"execution_count": 94,
|
|
"metadata": {},
|
|
"output_type": "execute_result"
|
|
}
|
|
],
|
|
"source": [
|
|
"next(g)"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 95,
|
|
"id": "8a250ce6-7e8e-4915-9ea0-1751a96046f0",
|
|
"metadata": {},
|
|
"outputs": [
|
|
{
|
|
"data": {
|
|
"text/plain": [
|
|
"16"
|
|
]
|
|
},
|
|
"execution_count": 95,
|
|
"metadata": {},
|
|
"output_type": "execute_result"
|
|
}
|
|
],
|
|
"source": [
|
|
"next(g)"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 98,
|
|
"id": "8949fbea-455c-483b-83b1-66b9c70fdf30",
|
|
"metadata": {},
|
|
"outputs": [
|
|
{
|
|
"ename": "StopIteration",
|
|
"evalue": "",
|
|
"output_type": "error",
|
|
"traceback": [
|
|
"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
|
|
"\u001b[0;31mStopIteration\u001b[0m Traceback (most recent call last)",
|
|
"Cell \u001b[0;32mIn[98], line 1\u001b[0m\n\u001b[0;32m----> 1\u001b[0m \u001b[38;5;28;43mnext\u001b[39;49m\u001b[43m(\u001b[49m\u001b[43mg\u001b[49m\u001b[43m)\u001b[49m\n",
|
|
"\u001b[0;31mStopIteration\u001b[0m: "
|
|
]
|
|
}
|
|
],
|
|
"source": [
|
|
"next(g)"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 99,
|
|
"id": "832bd2a5-cf99-40bf-9dd3-7a2833589485",
|
|
"metadata": {},
|
|
"outputs": [],
|
|
"source": [
|
|
"ll = [1, 2, 3, 4]\n",
|
|
"g = iter(ll)\n"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 100,
|
|
"id": "01662fa6-dfb9-4609-a04f-9394c7b63a16",
|
|
"metadata": {},
|
|
"outputs": [
|
|
{
|
|
"data": {
|
|
"text/plain": [
|
|
"1"
|
|
]
|
|
},
|
|
"execution_count": 100,
|
|
"metadata": {},
|
|
"output_type": "execute_result"
|
|
}
|
|
],
|
|
"source": [
|
|
"next(g)"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 101,
|
|
"id": "6c353acf-93a7-47c8-8016-90b9b407767d",
|
|
"metadata": {},
|
|
"outputs": [
|
|
{
|
|
"data": {
|
|
"text/plain": [
|
|
"2"
|
|
]
|
|
},
|
|
"execution_count": 101,
|
|
"metadata": {},
|
|
"output_type": "execute_result"
|
|
}
|
|
],
|
|
"source": [
|
|
"next(g)"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 102,
|
|
"id": "e0e9d459-7d96-4187-ba3e-8f8e6a69eb5d",
|
|
"metadata": {},
|
|
"outputs": [
|
|
{
|
|
"data": {
|
|
"text/plain": [
|
|
"3"
|
|
]
|
|
},
|
|
"execution_count": 102,
|
|
"metadata": {},
|
|
"output_type": "execute_result"
|
|
}
|
|
],
|
|
"source": [
|
|
"next(g)"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 103,
|
|
"id": "11f9029d-5029-496c-894e-b416d5b308d5",
|
|
"metadata": {},
|
|
"outputs": [
|
|
{
|
|
"data": {
|
|
"text/plain": [
|
|
"4"
|
|
]
|
|
},
|
|
"execution_count": 103,
|
|
"metadata": {},
|
|
"output_type": "execute_result"
|
|
}
|
|
],
|
|
"source": [
|
|
"next(g)"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 104,
|
|
"id": "8a94d0a3-d09b-4ab7-a465-93c7a6e1511e",
|
|
"metadata": {},
|
|
"outputs": [
|
|
{
|
|
"ename": "StopIteration",
|
|
"evalue": "",
|
|
"output_type": "error",
|
|
"traceback": [
|
|
"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
|
|
"\u001b[0;31mStopIteration\u001b[0m Traceback (most recent call last)",
|
|
"Cell \u001b[0;32mIn[104], line 1\u001b[0m\n\u001b[0;32m----> 1\u001b[0m \u001b[38;5;28;43mnext\u001b[39;49m\u001b[43m(\u001b[49m\u001b[43mg\u001b[49m\u001b[43m)\u001b[49m\n",
|
|
"\u001b[0;31mStopIteration\u001b[0m: "
|
|
]
|
|
}
|
|
],
|
|
"source": [
|
|
"next(g)"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": null,
|
|
"id": "c7250129-eab1-4fec-bb46-917e7c11f01e",
|
|
"metadata": {},
|
|
"outputs": [],
|
|
"source": []
|
|
}
|
|
],
|
|
"metadata": {
|
|
"kernelspec": {
|
|
"display_name": "Python 3 (ipykernel)",
|
|
"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": "3.10.15"
|
|
}
|
|
},
|
|
"nbformat": 4,
|
|
"nbformat_minor": 5
|
|
}
|