Add more exercises

Author: abregman

README.md

@@ -1,3 +1,5 @@
+<p align="center"><img src="images/python_exercises.png"/></p>
+
 # Python Exercises
 
 ## Hello World
@@ -6,6 +8,7 @@
 |--------|--------|------|----|
 | Hello World! | [Exercise](exercises/hello_world/hello_world.md) | | |
 | 22 times | [Exercise](exercises/hello_world/22_times.md) | | |
+| Access List Items | [Exercise](exercises/hello_world/access_list_items.md) | [Solution](solutions/hello_world/access_list_items.md) | |
 | Length | [Exercise](exercises/hello_world/length.md) | | |
 
 ## Data Types
@@ -15,6 +18,7 @@
 | Data Types? I know a few | [Exercise](exercises/data_types/I_know_a_few.md) | [Solution](solutions/exceptions/I_know_a_few.md) | |
 | Choose a Data Type - level 1 | [Exercise](exercises/data_types/choose_datatype_level_1.md) | [Solution](solutions/data_types/choose_datatype_level_1.md) | |
 | Choose a Data Type - level 2 | [Exercise](exercises/data_types/choose_datatype_level_2.md) | [Solution](solutions/data_types/choose_datatype_level_2.md) | |
+| Objects 101 | [Exercise](exercises/data_types/objects_101.md) | [Solution](solutions/data_types/objects_101.md) | |
 
 ## Loops
 
@@ -27,6 +31,12 @@
 |Name|Objective & Instructions|Solution|Comments|
 |--------|--------|------|----|
 | Calculator | [Exercise](exercises/functions/calculator.md) | [Solution](solutions/functions/calculator.md) | |
+ 
+## Magic Methods
+
+|Name|Objective & Instructions|Solution|Comments|
+|--------|--------|------|----|
+| Length Magic Method | [Exercise](exercises/magic_methods/length.md) | | |
 
 ## Unit Testing
 
@@ -54,3 +64,9 @@
 | File exists | [Exercise](exercises/os/file_exists.md) | | |
 | Print all the files in a directory | [Exercise](exercises/os/print_all_files_in_dir.md) | | |
 
+## Misc
+
+|Name|Objective & Instructions|Solution|Comments|
+|--------|--------|------|----|
+| Random Number | [Exercise](exercises/misc/random_number.md) | | |
+| Random Item | [Exercise](exercises/misc/random_item.md) | | |

exercises/data_types/objects_101.md

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+## Objects 101
+
+1. What information an object in Python holds? or what attributes an object has?
+ a. Explain each one of them

exercises/hello_world/access_list_items.md

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+## Access List Items
+
+Given the following list `li = [2, 0 ,1, 7, 2, 0, 2, 2]` perform the following:
+
+1. Print the first item of the list
+2. Print the last item of the list
+
+Bonus:
+
+1. Print random item of the list

exercises/magic_methods/length.md

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+## Length Magic Method
+
+1. Why the code below fails when executed?
+2. Fix it so it works
+
+```
+import collections
+
+Mushroom = collections.namedtuple('Mushroom', ['name', 'poisonous'])
+
+class MushroomsBusket:
+
+    def __init__(self):
+
+        self._mushrooms = [Mushroom('Oyster', False), Mushroom('Portobello', False)]
+
+mushroom_basket = MushroomsBusket()
+print(len(mushroom_basket))
+```

exercises/misc/random_item.md

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+## Random Item
+
+Write code to pick up a random item from a given list

exercises/misc/random_number.md

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+## Random Number
+
+Generate random number between 1 and 10

images/python_exercises.png

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+## Objects 101
+
+1. What information an object in Python holds? or what attributes an object has?
+ a. Explain each one of them
+
+* ID: unique identifier of the object
+* value: what data the object actually stores (e.g. an integer, string, ...)
+* type: the data type of the value (int, boolean, string, ...) 
+* reference count: how many times the object is references/used

solutions/data_types/objects_101.md

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+## Access List Items
+
+Given the following list `li = [2, 0 ,1, 7, 2, 0, 2, 2]` perform the following:
+
+1. Print the first item of the list - `print(li[0])`
+2. Print the last item of the list  - `print(li[-1])`
+
+Bonus:
+
+1. Print random item of the list
+
+```python
+from random import choice
+print(choice(li))
+```

solutions/hello_world/access_list_items.md

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+## Length Magic Method
+
+1. It will fail because the class MushroomsBasked doesn't implements __len__ magic method
+
+2.
+
+```python
+import collections
+
+Mushroom = collections.namedtuple('Mushroom', ['name', 'poisonous'])
+
+class MushroomsBusket:
+
+    def __init__(self):
+
+        self._mushrooms = [Mushroom('Oyster', False), Mushroom('Portobello', False)]
+
+    def __len__(self):
+        return len(self._mushrooms)
+
+mushroom_basket = MushroomsBusket()
+print(len(mushroom_basket))
+```

solutions/magic_methods/length.md

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+#!/usr/bin/env python
+# coding=utf-8
+
+from random import choice
+
+li = [2, 0, 1, 7]
+
+print(choice(li))