mirror of
https://github.com/donnemartin/interactive-coding-challenges.git
synced 2024-03-22 13:11:13 +08:00
Add the Remove specified characters in a string challenge and solution its testcases
This commit is contained in:
eamanu
parent
4144b6f851
commit
379474ccf9
0
arrays_strings/remove_chars/__init__.py
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0
arrays_strings/remove_chars/__init__.py
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205
arrays_strings/remove_chars/remove_chars_challenge.ipynb
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205
arrays_strings/remove_chars/remove_chars_challenge.ipynb
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{
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"cells": [
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{
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"cell_type": "markdown",
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"metadata": {
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"deletable": true,
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"editable": true
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},
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"source": [
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"This notebook was prepared by [eamanu](http://github.com/eamanu). Source and license info is on [GitHub](https://github.com/donnemartin/interactive-coding-challenges)."
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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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"deletable": true,
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"editable": true
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},
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"source": [
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"# Challenge Notebook"
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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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"deletable": true,
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"editable": true
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},
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"source": [
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"## Problem: Remove specified characters in a string\t\n",
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"\n",
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"* [Constraints](#Constraints)\n",
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"* [Test Cases](#Test-Cases)\n",
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"* [Algorithm](#Algorithm)\n",
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"* [Code](#Code)\n",
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"* [Unit Test](#Unit-Test)\n",
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"* [Solution Notebook](#Solution-Notebook)"
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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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"deletable": true,
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"editable": true
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},
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"source": [
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"## Constraints\n",
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"\n",
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"* Can we assume the string is ASCII?\n",
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" * Yes\n",
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" * Note: Unicode strings could require special handling depending on your language\n",
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"* Can we assume this is case sensitive?\n",
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" * Yes\n",
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"* Can we use additional data structures?\n",
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" * Yes\n",
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"* Can we assume this fits in memory?\n",
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" * Yes"
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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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"deletable": true,
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"editable": true
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},
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"source": [
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"## Test Cases\n",
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"\n",
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"String = 'Python is great'\n",
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"chars -> This is the characters to remove from String\n",
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"\n",
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"* chars = None -> False\n",
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"* chars = '' -> 'Python is great'\n",
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"* chars = 'y' -> 'Pthon is great'\n",
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"* chars = 'tp' -> 'yhon is grea'"
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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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"deletable": true,
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"editable": true
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},
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"source": [
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"## Algorithm\n",
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"\n",
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"Refer to the [Solution Notebook](http://nbviewer.ipython.org/github/donnemartin/interactive-coding-challenges/blob/master/arrays_strings/remove_chars/remove_chars_solution.ipynb). If you are stuck and need a hint, the solution notebook's algorithm discussion might be a good place to start."
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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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"deletable": true,
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"editable": true
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},
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"source": [
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"## Code"
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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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"deletable": true,
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"editable": true
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},
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"outputs": [],
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"source": [
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"class RemoveChars(object):\n",
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"\n",
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" def remove_chars(self, string, chars):\n",
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" # TODO: Implement me\n",
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" pass"
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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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"deletable": true,
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"editable": true
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},
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"source": [
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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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"deletable": true,
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"editable": true
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},
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"source": [
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"**The following unit test is expected to fail until you solve the challenge.**"
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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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"deletable": true,
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"editable": true
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},
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"outputs": [],
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"source": [
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"# %load test_remove_chars.py\n",
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"from nose.tools import assert_equal\n",
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"\n",
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"class TestRemoveChars(object):\n",
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"\n",
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" def test_remove_chars(self, string, func):\n",
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" assert_equal(func(string, None), False)\n",
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" assert_equal(func(string, ''), 'Python is great')\n",
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" assert_equal(func(string, 'y'), 'Pthon is great')\n",
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" assert_equal(func(string, 'tP'), 'yhon is grea')\n",
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" print('Success: test_remove_chars')\n",
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"\n",
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"\n",
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"def main():\n",
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" test = TestRemoveChars()\n",
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" remove_chars = RemoveChars()\n",
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" string = 'Python is great'\n",
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" test.test_remove_chars(string, remove_chars.remove_chars)\n",
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" \n",
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"\n",
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"if __name__ == '__main__':\n",
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" main()"
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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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"deletable": true,
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"editable": true
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},
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"source": [
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"## Solution Notebook\n",
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"\n",
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"Review the [Solution Notebook](http://nbviewer.ipython.org/github/donnemartin/interactive-coding-challenges/blob/master/arrays_strings/remove_chars/remove_chars_solution.ipynb) for a discussion on algorithms and code solutions."
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]
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Python 2",
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"language": "python",
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"name": "python2"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 2
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython2",
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"version": "2.7.12"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 0
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}
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230
arrays_strings/remove_chars/remove_chars_solution.ipynb
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230
arrays_strings/remove_chars/remove_chars_solution.ipynb
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@ -0,0 +1,230 @@
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{
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"cells": [
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{
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"cell_type": "markdown",
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"metadata": {
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"deletable": true,
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"editable": true
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},
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"source": [
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"This notebook was prepared by [eamanu](http://github.com/eamanu). Source and license info is on [GitHub](https://github.com/donnemartin/interactive-coding-challenges)."
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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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"deletable": true,
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"editable": true
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},
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"source": [
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"# Solution Notebook"
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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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"deletable": true,
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"editable": true
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},
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"source": [
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"## Problem: Remove specified characters in a string\t\n",
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"\n",
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"* [Constraints](#Constraints)\n",
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"* [Test Cases](#Test-Cases)\n",
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"* [Algorithm 1: Simple replace of chars](#Algorithm-1:-Simple-replace-of-chars)\n",
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"* [Code: Simple replace of chars](#Code:-Simple-replace-of-chars)\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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"deletable": true,
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"editable": true
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},
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"source": [
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"## Constraints\n",
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"\n",
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"* Can we assume the string is ASCII?\n",
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" * Yes\n",
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" * Note: Unicode strings could require special handling depending on your language\n",
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"* Can we assume this is case sensitive?\n",
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" * Yes\n",
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"* Can we use additional data structures?\n",
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" * Yes\n",
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"* Can we assume this fits in memory?\n",
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" * Yes"
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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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"deletable": true,
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"editable": true
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},
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"source": [
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"## Test Cases\n",
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"\n",
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"String = 'Python is great'\n",
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"chars -> This is the characters to remove from String\n",
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"\n",
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"* chars = None -> False\n",
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"* chars = '' -> 'Python is great'\n",
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"* chars = 'y' -> 'Pthon is great'\n",
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"* chars = 'tp' -> 'yhon is grea'"
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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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"deletable": true,
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"editable": true
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},
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"source": [
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"## Algorithm 1: Simple replace of chars\n",
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"\n",
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"We just replace the characters for \"\"\n",
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"\n",
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"* If the chars to remove is None\n",
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" * Return False\n",
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"* If the chars is empty -> '' \n",
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" * Return the same string\n",
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"* If is just one characters to delete \n",
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" * We replace the characters to \"\" and Return the new string\n",
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"* If there are two or more characters to delete\n",
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" * We replace the first target character for \"\" from the string, and then replace the second, and then the third... etc\n",
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" "
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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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"deletable": true,
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"editable": true
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},
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"source": [
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"## Code: Simple replace of chars"
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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": 5,
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"metadata": {
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"collapsed": false,
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"deletable": true,
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"editable": true
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},
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"outputs": [],
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"source": [
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"class RemoveChars(object):\n",
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" \n",
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" def remove_chars(self, string, chars):\n",
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" if chars is None:\n",
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" return False\n",
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" \n",
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" if len(chars) <= 1:\n",
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" return string.replace(chars, \"\")\n",
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" \n",
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" if len(chars) > 1:\n",
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" for c in chars:\n",
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" string = string.replace(c, \"\")\n",
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" return string"
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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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"deletable": true,
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"editable": true
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},
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"source": [
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"## Unit Test"
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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": 6,
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"metadata": {
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"collapsed": false,
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"deletable": true,
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"editable": true
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},
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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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"Success: test_remove_chars\n"
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]
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}
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],
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"source": [
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"# %load test_remove_chars.py\n",
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"from nose.tools import assert_equal\n",
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"\n",
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"class TestRemoveChars(object):\n",
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"\n",
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" def test_remove_chars(self, string, func):\n",
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" assert_equal(func(string, None), False)\n",
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" assert_equal(func(string, ''), 'Python is great')\n",
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" assert_equal(func(string, 'y'), 'Pthon is great')\n",
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" assert_equal(func(string, 'tP'), 'yhon is grea')\n",
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" print('Success: test_remove_chars')\n",
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"\n",
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"\n",
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"def main():\n",
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" test = TestRemoveChars()\n",
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" remove_chars = RemoveChars()\n",
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" string = 'Python is great'\n",
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" test.test_remove_chars(string, remove_chars.remove_chars)\n",
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" \n",
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"\n",
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"if __name__ == '__main__':\n",
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" main()"
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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": 7,
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"metadata": {
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"collapsed": false,
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"deletable": true,
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"editable": true,
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"scrolled": true
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},
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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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"Success: test_remove_chars\n"
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]
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}
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],
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"source": [
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"%run -i test_remove_chars.py"
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]
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Python 2",
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"language": "python",
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"name": "python2"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 2
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython2",
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"version": "2.7.12"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 0
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}
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23
arrays_strings/remove_chars/test_remove_chars.py
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23
arrays_strings/remove_chars/test_remove_chars.py
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# %load test_remove_chars.py
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from nose.tools import assert_equal
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class TestRemoveChars(object):
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def test_remove_chars(self, string, func):
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assert_equal(func(string, None), False)
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assert_equal(func(string, ''), 'Python is great')
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assert_equal(func(string, 'y'), 'Pthon is great')
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assert_equal(func(string, 'tP'), 'yhon is grea')
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print('Success: test_remove_chars')
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def main():
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test = TestRemoveChars()
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remove_chars = RemoveChars()
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string = 'Python is great'
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test.test_remove_chars(string, remove_chars.remove_chars)
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if __name__ == '__main__':
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main()
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20
arrays_strings/remove_chars/test_remove_chars.py~
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20
arrays_strings/remove_chars/test_remove_chars.py~
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from
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class TestRemoveChars(object):
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def test_remove_chars(self, string, func):
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assert_equal(func(string, None), False)
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assert_equal(func(string, ''), 'Python is great')
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assert_equal(func(string, 'y'), 'Pthon is great')
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assert_equal(func(string, 'tP'), 'yhon is grea')
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print('Success: test_remove_chars')
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def main():
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test = TestRemoveChars()
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remove_chars = RemoveChars()
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string = 'Python is great'
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test.test_remove_chars(string, remove_chars.remove_chars)
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if __name__ == '__main__':
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main()
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