mirror of
https://github.com/donnemartin/interactive-coding-challenges.git
synced 2024-03-22 13:11:13 +08:00
Reworked notebook: Added more detail to constraints and test cases. Reworked algorithm discussion, code, and unit test.
This commit is contained in:
Donne Martin
parent
9490979fe5
commit
585f5b8978
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@ -13,17 +13,20 @@
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"source": [
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"## Problem: Implement a linked list with insert, append, find, delete, length, and print methods\n",
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"\n",
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"* [Clarifying Questions](#Clarifying-Questions)\n",
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"* [Constraints and Assumptions](#Constraints-and-Assumptions)\n",
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"* [Test Cases](#Test-Cases)\n",
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"* [Algorithm](#Algorithm)\n",
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"* [Code](#Code)"
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"* [Code](#Code)\n",
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"* [Unit Test](#Unit-Test)"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Clarifying Questions\n",
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"## Constraints and Assumptions\n",
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"\n",
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"*Problem statements are often intentionally ambiguous. Identifying constraints and stating assumptions can help to ensure you code the intended solution.*\n",
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"\n",
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"* Is this a singly or doubly linked list?\n",
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" * Singly\n",
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@ -163,11 +166,19 @@
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"execution_count": 1,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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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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"Overwriting linked_list.py\n"
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]
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}
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],
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"source": [
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"%%writefile linked_list.py\n",
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"\n",
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@ -200,6 +211,7 @@
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" else:\n",
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" node.next = self.head\n",
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" self.head = node\n",
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" return node\n",
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" \n",
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" def append(self, data, next_node=None):\n",
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" if data is None:\n",
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@ -212,6 +224,7 @@
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" while curr_node.next is not None:\n",
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" curr_node = curr_node.next\n",
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" curr_node.next = node\n",
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" return node\n",
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" \n",
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" def find(self, data):\n",
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" if data is None:\n",
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@ -224,6 +237,7 @@
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" return curr_node\n",
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" else:\n",
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" curr_node = curr_node.next\n",
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" return\n",
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" \n",
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" def delete(self, data):\n",
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" if data is None:\n",
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@ -244,14 +258,22 @@
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" curr_node = self.head\n",
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" while curr_node is not None:\n",
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" print(curr_node.data)\n",
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" curr_node = curr_node.next"
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" curr_node = curr_node.next\n",
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"\n",
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" def get_all_data(self):\n",
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" data = []\n",
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" curr_node = self.head\n",
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" while curr_node is not None:\n",
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" data.append(curr_node.data)\n",
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" curr_node = curr_node.next\n",
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" return data"
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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": null,
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"execution_count": 2,
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"metadata": {
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"collapsed": true
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"collapsed": false
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},
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"outputs": [],
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"source": [
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@ -259,139 +281,170 @@
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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": null,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"# Test insert_to_front\n",
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"# Insert in an empty list\n",
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"linked_list = LinkedList(None)\n",
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"linked_list.insert_to_front(10)\n",
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"linked_list.print_list()\n",
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"# Insert a NULL\n",
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"linked_list.insert_to_front(None)\n",
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"linked_list.print_list()\n",
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"# Insert in a list with one element or more elements\n",
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"linked_list.insert_to_front('a')\n",
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"linked_list.insert_to_front('bc')\n",
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"linked_list.print_list()"
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"## Unit Test"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"*It is important to identify and run through general and edge cases from the [Test Cases](#Test-Cases) section by hand. You generally will not be asked to write a unit test like what is shown below.*"
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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": null,
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"execution_count": 3,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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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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"Test: insert_to_front on an empty list\n",
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"Test: insert_to_front on a NULL\n",
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"Test: insert_to_front general case\n",
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"Success: test_insert_to_front\n",
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"\n",
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"Test: append on an empty list\n",
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"Test: append a NULL\n",
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"Test: append general case\n",
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"Success: test_append\n",
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"\n",
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"Test: find on an empty list\n",
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"Test: find a NULL\n",
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"Test: find general case with matches\n",
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"Test: find general case with no matches\n",
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"Success: test_find\n",
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"\n",
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"Test: delete on an empty list\n",
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"Test: delete a NULL\n",
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"Test: delete general case with matches\n",
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"Test: delete general case with no matches\n",
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"Success: test_delete\n",
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"\n",
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"Test: len on an empty list\n",
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"Test: len general case\n",
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"Success: test_len\n",
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"\n"
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]
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}
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],
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"source": [
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"# Test append\n",
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"# Insert in an empty list\n",
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"linked_list = LinkedList(None)\n",
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"linked_list.append(10)\n",
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"linked_list.print_list()\n",
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"# Insert a NULL\n",
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"linked_list.append(None)\n",
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"linked_list.print_list()\n",
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"# Insert in a list with one element or more elements\n",
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"linked_list.append('a')\n",
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"linked_list.append('bc')\n",
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"linked_list.print_list()"
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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": null,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"source": [
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"# Test find\n",
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"# Find in an empty list\n",
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"linked_list = LinkedList(None)\n",
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"node = linked_list.find('a')\n",
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"print(node)\n",
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"# Find a NULL\n",
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"head = Node(10)\n",
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"linked_list = LinkedList(head)\n",
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"node = linked_list.find(None)\n",
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"print(node)\n",
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"# Find in a list with one element or more matching elements\n",
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"head = Node(10)\n",
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"linked_list = LinkedList(head)\n",
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"linked_list.insert_to_front('a')\n",
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"linked_list.insert_to_front('bc')\n",
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"node = linked_list.find('a')\n",
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"print(node)\n",
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"# Find in a list with no matches\n",
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"node = linked_list.find('aaa')\n",
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"print(node)"
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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": null,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"source": [
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"# Test delete\n",
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"# Delete in an empty list\n",
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"linked_list = LinkedList(None)\n",
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"linked_list.delete('a')\n",
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"linked_list.print_list()\n",
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"# Delete a NULL\n",
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"head = Node(10)\n",
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"linked_list = LinkedList(head)\n",
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"linked_list.delete(None)\n",
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"linked_list.print_list()\n",
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"# Delete in a list with one element or more matching elements\n",
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"head = Node(10)\n",
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"linked_list = LinkedList(head)\n",
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"linked_list.insert_to_front('a')\n",
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"linked_list.insert_to_front('bc')\n",
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"linked_list.delete('a')\n",
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"linked_list.print_list()\n",
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"# Delete in a list with no matches\n",
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"linked_list.delete('aa')"
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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": null,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"source": [
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"# Test length\n",
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"# Zero elements\n",
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"linked_list = LinkedList(None)\n",
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"print(len(linked_list))\n",
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"# One or more elements\n",
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"head = Node(10)\n",
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"linked_list = LinkedList(head)\n",
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"linked_list.insert_to_front('a')\n",
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"linked_list.insert_to_front('bc')\n",
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"print(len(linked_list))"
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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": null,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"source": [
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"# Test empty print\n",
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"linked_list = LinkedList(None)\n",
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"linked_list.print_list()"
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"from nose.tools import assert_equal\n",
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"\n",
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"class Test(object):\n",
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" def test_insert_to_front(self):\n",
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" print('Test: insert_to_front on an empty list')\n",
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" linked_list = LinkedList(None)\n",
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" linked_list.insert_to_front(10)\n",
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" assert_equal(linked_list.get_all_data(), [10])\n",
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"\n",
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" print('Test: insert_to_front on a NULL')\n",
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" linked_list.insert_to_front(None)\n",
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" assert_equal(linked_list.get_all_data(), [10])\n",
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"\n",
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" print('Test: insert_to_front general case')\n",
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" linked_list.insert_to_front('a')\n",
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" linked_list.insert_to_front('bc')\n",
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" assert_equal(linked_list.get_all_data(), ['bc', 'a', 10])\n",
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" \n",
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" print('Success: test_insert_to_front\\n')\n",
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" \n",
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" def test_append(self):\n",
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" print('Test: append on an empty list')\n",
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" linked_list = LinkedList(None)\n",
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" linked_list.append(10)\n",
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" assert_equal(linked_list.get_all_data(), [10])\n",
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"\n",
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" print('Test: append a NULL')\n",
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" linked_list.append(None)\n",
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" assert_equal(linked_list.get_all_data(), [10])\n",
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"\n",
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" print('Test: append general case')\n",
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" linked_list.append('a')\n",
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" linked_list.append('bc')\n",
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" assert_equal(linked_list.get_all_data(), [10, 'a', 'bc'])\n",
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" \n",
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" print('Success: test_append\\n')\n",
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" \n",
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" def test_find(self):\n",
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" print('Test: find on an empty list')\n",
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" linked_list = LinkedList(None)\n",
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" node = linked_list.find('a')\n",
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" assert_equal(node, None)\n",
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"\n",
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" print('Test: find a NULL')\n",
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" head = Node(10)\n",
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" linked_list = LinkedList(head)\n",
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" node = linked_list.find(None)\n",
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" assert_equal(node, None)\n",
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"\n",
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" print('Test: find general case with matches')\n",
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" head = Node(10)\n",
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" linked_list = LinkedList(head)\n",
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" linked_list.insert_to_front('a')\n",
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" linked_list.insert_to_front('bc')\n",
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" node = linked_list.find('a')\n",
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" assert_equal(str(node), 'a')\n",
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"\n",
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" print('Test: find general case with no matches')\n",
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" node = linked_list.find('aaa')\n",
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" assert_equal(node, None)\n",
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" \n",
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" print('Success: test_find\\n')\n",
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" \n",
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" def test_delete(self):\n",
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" print('Test: delete on an empty list')\n",
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" linked_list = LinkedList(None)\n",
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" linked_list.delete('a')\n",
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" assert_equal(linked_list.get_all_data(), [])\n",
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"\n",
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" print('Test: delete a NULL')\n",
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" head = Node(10)\n",
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" linked_list = LinkedList(head)\n",
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" linked_list.delete(None)\n",
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" assert_equal(linked_list.get_all_data(), [10])\n",
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"\n",
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" print('Test: delete general case with matches')\n",
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" head = Node(10)\n",
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" linked_list = LinkedList(head)\n",
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" linked_list.insert_to_front('a')\n",
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" linked_list.insert_to_front('bc')\n",
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" linked_list.delete('a')\n",
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" assert_equal(linked_list.get_all_data(), ['bc', 10])\n",
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"\n",
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" print('Test: delete general case with no matches')\n",
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" linked_list.delete('aa')\n",
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" assert_equal(linked_list.get_all_data(), ['bc', 10])\n",
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" \n",
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" print('Success: test_delete\\n')\n",
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" \n",
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" def test_len(self):\n",
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" print('Test: len on an empty list')\n",
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" linked_list = LinkedList(None)\n",
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" assert_equal(len(linked_list), 0)\n",
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"\n",
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" print('Test: len general case')\n",
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" head = Node(10)\n",
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" linked_list = LinkedList(head)\n",
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" linked_list.insert_to_front('a')\n",
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" linked_list.insert_to_front('bc')\n",
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" assert_equal(len(linked_list), 3)\n",
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" \n",
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" print('Success: test_len\\n')\n",
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"\n",
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"if __name__ == '__main__':\n",
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" test = Test()\n",
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" test.test_insert_to_front()\n",
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" test.test_append()\n",
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" test.test_find()\n",
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" test.test_delete()\n",
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" test.test_len()"
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]
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}
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],
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@ -28,6 +28,7 @@ class LinkedList(object):
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else:
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node.next = self.head
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self.head = node
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return node
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def append(self, data, next_node=None):
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if data is None:
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@ -40,6 +41,7 @@ class LinkedList(object):
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while curr_node.next is not None:
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curr_node = curr_node.next
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curr_node.next = node
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return node
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def find(self, data):
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if data is None:
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@ -52,6 +54,7 @@ class LinkedList(object):
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return curr_node
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else:
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curr_node = curr_node.next
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return
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def delete(self, data):
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if data is None:
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@ -73,3 +76,11 @@ class LinkedList(object):
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while curr_node is not None:
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print(curr_node.data)
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curr_node = curr_node.next
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def get_all_data(self):
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data = []
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curr_node = self.head
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while curr_node is not None:
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data.append(curr_node.data)
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curr_node = curr_node.next
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return data
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