03.02b.lists-exercises.ipynb

{"nbformat":4,"nbformat_minor":0,"metadata":{"kernelspec":{"display_name":"Python 3","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":"3.6.5"},"colab":{"name":"02.02b.lists-exercises.ipynb","provenance":[],"collapsed_sections":[]}},"cells":[{"cell_type":"markdown","metadata":{"id":"hApZBwKV0Gik","colab_type":"text"},"source":["# 1. Indexing and Slicing"]},{"cell_type":"code","metadata":{"id":"oTbtpbEV0Gin","colab_type":"code","colab":{}},"source":["years = [1998,1999,2000,2001,2002,2003]"],"execution_count":0,"outputs":[]},{"cell_type":"markdown","metadata":{"id":"d-fyxuXe0Gis","colab_type":"text"},"source":["<br>"]},{"cell_type":"markdown","metadata":{"id":"1IkvVMgb0Gis","colab_type":"text"},"source":["**Use `list` `indexing` Grab the first value in `a_list`**"]},{"cell_type":"code","metadata":{"id":"BOilLngc0Git","colab_type":"code","colab":{}},"source":["first_year = years[0]"],"execution_count":0,"outputs":[]},{"cell_type":"markdown","metadata":{"id":"bCg3XLua0Giv","colab_type":"text"},"source":["<br>\n","<br>"]},{"cell_type":"markdown","metadata":{"id":"Bu6Ns7U-0Giw","colab_type":"text"},"source":["**Use `list` `slicing` to grab the last three values in `a_list`**"]},{"cell_type":"code","metadata":{"id":"Qoggi1hC0Gix","colab_type":"code","colab":{"base_uri":"https://localhost:8080/","height":34},"outputId":"ab218bf2-72dd-4f35-d745-4db50771fd15","executionInfo":{"status":"ok","timestamp":1577474976011,"user_tz":480,"elapsed":365,"user":{"displayName":"Matt Hess","photoUrl":"","userId":"00800340733434721825"}}},"source":["max_idx_of_years = len(years) - 1\n","last_three_years = years[max_idx_of_years - 2 : max_idx_of_years + 1]\n","\n","# OR \n","len_of_years = len(years)\n","last_three_years = years[len_of_years - 3 : len_of_years]\n","\n","print(first_year, last_three_years)"],"execution_count":10,"outputs":[{"output_type":"stream","text":["1998 [2001, 2002, 2003]\n"],"name":"stdout"}]},{"cell_type":"markdown","metadata":{"id":"LT9-Jaeo0Gi0","colab_type":"text"},"source":["<br>\n","<br>"]},{"cell_type":"markdown","metadata":{"id":"emWBUzV90Gi1","colab_type":"text"},"source":["**This next cell will make sure that the variables `first_year` and `last_three_years` have been populated with the appropriate values**\n","\n","> Hint: You can always use `print()` statements to check what is stored inside of a variable, if the `assert` does not pass!"]},{"cell_type":"code","metadata":{"id":"0FOmMN-u0Gi2","colab_type":"code","colab":{}},"source":["assert first_year == 1998\n","assert last_three_years == [2001,2002,2003]"],"execution_count":0,"outputs":[]},{"cell_type":"markdown","metadata":{"id":"OA1MnvB10Gi4","colab_type":"text"},"source":["<hr>\n","<br>\n","<br>\n","<br>"]},{"cell_type":"markdown","metadata":{"id":"VfXYF5zD0Gi5","colab_type":"text"},"source":["# 2. Mutating Lists"]},{"cell_type":"markdown","metadata":{"id":"AVl7Ac8n0Gi5","colab_type":"text"},"source":["### Let's create an empty list"]},{"cell_type":"code","metadata":{"id":"KO_d1u8d0Gi6","colab_type":"code","colab":{}},"source":["my_list = []"],"execution_count":0,"outputs":[]},{"cell_type":"markdown","metadata":{"id":"pXvIkb4o1_0T","colab_type":"text"},"source":["#### Print `my_list`"]},{"cell_type":"code","metadata":{"id":"YCzYBVxp2EKI","colab_type":"code","colab":{"base_uri":"https://localhost:8080/","height":34},"outputId":"7cf2ee66-3321-4d69-959e-0d056f22ef45","executionInfo":{"status":"ok","timestamp":1577475140725,"user_tz":480,"elapsed":361,"user":{"displayName":"Matt Hess","photoUrl":"","userId":"00800340733434721825"}}},"source":["my_list"],"execution_count":24,"outputs":[{"output_type":"execute_result","data":{"text/plain":["[]"]},"metadata":{"tags":[]},"execution_count":24}]},{"cell_type":"markdown","metadata":{"id":"Ra0Hjp6A0Gi9","colab_type":"text"},"source":["<br>\n"]},{"cell_type":"markdown","metadata":{"id":"AsphPYdf0Gi-","colab_type":"text"},"source":["### Appending values to our list with `.append()`.\n","Feel free to run `print()` statements to check what `my_list` looks like."]},{"cell_type":"markdown","metadata":{"id":"lymYB0I30Gi_","colab_type":"text"},"source":["```python\n","Append 'Python'\n","```"]},{"cell_type":"code","metadata":{"id":"dUj3DTSf0GjA","colab_type":"code","colab":{}},"source":["my_list.append('Python')"],"execution_count":0,"outputs":[]},{"cell_type":"markdown","metadata":{"id":"wOF11o6o0GjD","colab_type":"text"},"source":["```python\n","Append 'is ok'\n","```"]},{"cell_type":"code","metadata":{"id":"WWDyoaLk0GjE","colab_type":"code","colab":{}},"source":["my_list.append('is ok')"],"execution_count":0,"outputs":[]},{"cell_type":"markdown","metadata":{"id":"ax3qXaPS0GjH","colab_type":"text"},"source":["```python\n","Append 'sometimes'\n","```"]},{"cell_type":"code","metadata":{"id":"HHD8nOAx0GjH","colab_type":"code","colab":{}},"source":["my_list.append('sometimes')"],"execution_count":0,"outputs":[]},{"cell_type":"markdown","metadata":{"id":"TgvQU2PZ1ojN","colab_type":"text"},"source":["#### Print `my_list`"]},{"cell_type":"code","metadata":{"id":"RczCdYCk1n-Y","colab_type":"code","colab":{"base_uri":"https://localhost:8080/","height":34},"outputId":"612a1d40-805a-4f4f-ffc6-6622c3b5cf46","executionInfo":{"status":"ok","timestamp":1577475146244,"user_tz":480,"elapsed":359,"user":{"displayName":"Matt Hess","photoUrl":"","userId":"00800340733434721825"}}},"source":["my_list"],"execution_count":28,"outputs":[{"output_type":"execute_result","data":{"text/plain":["['Python', 'is ok', 'sometimes']"]},"metadata":{"tags":[]},"execution_count":28}]},{"cell_type":"markdown","metadata":{"id":"MUYBt5jf0GjL","colab_type":"text"},"source":["<br>"]},{"cell_type":"markdown","metadata":{"id":"Kk3kUnP20GjM","colab_type":"text"},"source":["### Removing values from our list with `.remove()`."]},{"cell_type":"markdown","metadata":{"id":"i5PcXO6c0GjN","colab_type":"text"},"source":["```python\n","Remove 'sometimes'\n","```"]},{"cell_type":"code","metadata":{"id":"lUKkACyQ0GjO","colab_type":"code","colab":{}},"source":["my_list.remove('sometimes')\n"],"execution_count":0,"outputs":[]},{"cell_type":"markdown","metadata":{"id":"G3IYh-AM16-B","colab_type":"text"},"source":["#### Print my_list"]},{"cell_type":"code","metadata":{"id":"njtuAq4Y16fm","colab_type":"code","colab":{"base_uri":"https://localhost:8080/","height":34},"outputId":"8a44a63d-4112-4847-f4ad-b46e1a97b62e","executionInfo":{"status":"ok","timestamp":1577475153295,"user_tz":480,"elapsed":357,"user":{"displayName":"Matt Hess","photoUrl":"","userId":"00800340733434721825"}}},"source":["my_list"],"execution_count":30,"outputs":[{"output_type":"execute_result","data":{"text/plain":["['Python', 'is ok']"]},"metadata":{"tags":[]},"execution_count":30}]},{"cell_type":"markdown","metadata":{"id":"C_35G5rH0GjQ","colab_type":"text"},"source":["<br>"]},{"cell_type":"markdown","metadata":{"id":"MYTRTUhs0GjR","colab_type":"text"},"source":["### Use list `indexing` to update values in `my_list`"]},{"cell_type":"markdown","metadata":{"id":"PRCcrpyE0GjS","colab_type":"text"},"source":["```python\n","Update 'is ok' to 'is awesome'\n","```"]},{"cell_type":"code","metadata":{"id":"jg4uFd9i0GjT","colab_type":"code","colab":{"base_uri":"https://localhost:8080/","height":34},"outputId":"35151ce3-4a3a-4339-c94d-a5449260a12d","executionInfo":{"status":"ok","timestamp":1577475160088,"user_tz":480,"elapsed":331,"user":{"displayName":"Matt Hess","photoUrl":"","userId":"00800340733434721825"}}},"source":["my_list[1] = 'is awesome'\n","my_list"],"execution_count":31,"outputs":[{"output_type":"execute_result","data":{"text/plain":["['Python', 'is awesome']"]},"metadata":{"tags":[]},"execution_count":31}]},{"cell_type":"markdown","metadata":{"id":"RVd8sBHs0GjW","colab_type":"text"},"source":["<br>"]},{"cell_type":"markdown","metadata":{"id":"By06cSXI0GjX","colab_type":"text"},"source":["### Test your Solution"]},{"cell_type":"code","metadata":{"id":"AmgTcVxR0GjY","colab_type":"code","colab":{}},"source":["assert my_list == ['Python', 'is awesome']"],"execution_count":0,"outputs":[]},{"cell_type":"markdown","metadata":{"id":"2rOzfKVg0Gjb","colab_type":"text"},"source":["***\n","<br>\n","<br>\n","<br>"]},{"cell_type":"markdown","metadata":{"id":"RE_4K_Ld0Gjc","colab_type":"text"},"source":["# 3. Create a new list without modifiying the original one\n"]},{"cell_type":"code","metadata":{"id":"jxzvZ9D00Gje","colab_type":"code","colab":{}},"source":["original = ['I', 'am', 'learning', 'hacking', 'in']"],"execution_count":0,"outputs":[]},{"cell_type":"markdown","metadata":{"id":"RJeTECCH0Gjh","colab_type":"text"},"source":["<br>"]},{"cell_type":"markdown","metadata":{"id":"bFeuqKHt0Gjj","colab_type":"text"},"source":["### Steps Broken Down"]},{"cell_type":"markdown","metadata":{"id":"Fbzf8PqH0Gjl","colab_type":"text"},"source":["\n","Copy original List by value not by reference \n"]},{"cell_type":"code","metadata":{"id":"-a2A7T3a0Gjm","colab_type":"code","colab":{}},"source":["modified = original.copy()"],"execution_count":0,"outputs":[]},{"cell_type":"markdown","metadata":{"id":"4Iygg6pg0Gjq","colab_type":"text"},"source":["```python\n","Update 'hacking' to 'lists'\n","```"]},{"cell_type":"code","metadata":{"id":"jSThDxrt0Gj0","colab_type":"code","colab":{}},"source":["modified[3] = 'lists'"],"execution_count":0,"outputs":[]},{"cell_type":"markdown","metadata":{"id":"mUe0_IZ80Gj4","colab_type":"text"},"source":["```python \n","Append 'Python'\n","```"]},{"cell_type":"code","metadata":{"id":"OHXlQwqc0Gj4","colab_type":"code","colab":{}},"source":["modified.append('Python')"],"execution_count":0,"outputs":[]},{"cell_type":"markdown","metadata":{"id":"cUv1U-I30Gj6","colab_type":"text"},"source":["<br>"]},{"cell_type":"markdown","metadata":{"id":"xMTp8Y5-0Gj7","colab_type":"text"},"source":["#### Test Your Solution"]},{"cell_type":"code","metadata":{"id":"Va-EpxZT0Gj8","colab_type":"code","colab":{}},"source":["assert original == ['I', 'am', 'learning', 'hacking', 'in']\n","assert modified == ['I', 'am', 'learning', 'lists', 'in', 'Python']"],"execution_count":0,"outputs":[]}]}