Add a couple of exercises

Related to numbers and variables.

Author: abregman

README.md

@@ -2,7 +2,7 @@
 
 :information_source:  This repo contains questions and exercises to learn and practice Python
 
-:bar_chart:  There are currently **49** exercises and questions
+:bar_chart:  There are currently **53** exercises and questions
 
 # Python Exercises
 
@@ -35,6 +35,8 @@
 | Locations or Names | [Exercise](exercises/variables/locations_or_names.md) | [Solution](solutions/variables/locations_or_names.md) | |
 | Types | [Exercise](exercises/variables/types.md) | [Solution](solutions/variables/types.md) | |
 | Multiple Value Assignment | [Exercise](exercises/variables/multiple_value_assigment.md) | [Solution](solutions/variables/multiple_value_assigment.md) | |
+| Copying Variables | [Exercise](exercises/variables/copying_variables.md) | [Solution](solutions/variables/copying_variables.md) | |
+| Mutable Objects | [Exercise](exercises/variables/mutable_objects.md) | [Solution](solutions/variables/mutable_objects.md) | |
 
 ## Booleans
 
@@ -58,6 +60,7 @@
 
 |Name|Objective & Instructions|Solution|Comments|
 |--------|--------|------|----|
+| What is the result? | [Exercise](exercises/numbers/what_is_the_result.md) | [Solution](solutions/numbers/what_is_the_result.md) | |
 | Palindrome | [Exercise](exercises/numbers/palindrome.md) | [Solution](solutions/numbers/palindrome.md) | |
 
 ## Lists

exercises/numbers/what_is_the_result.md

@@ -0,0 +1,11 @@
+## What is the result?
+
+What is the value of each of the following variables?
+
+1. `x = 5,000`
+2. `x = 5_000`
+3. `x = 5_0_0`
+
+### Solution
+
+Click [here](solutions/numbers/what_is_the_result.md) for the solution

exercises/variables/copying_variables.md

@@ -0,0 +1,9 @@
+## Copying Variables
+
+1. True or False?
+
+Running `var = 3` creates an object. Running `another_var = var` creates another object with the value of `var`
+
+### Solution
+
+Click [here](solutions/variables/copying_variables.md) to view the solution.

exercises/variables/mutable_objects.md

@@ -0,0 +1,17 @@
+## Mutable Objects
+
+1. What would be the output of the following program? explain
+
+```
+x = [1, 2 ,3]
+y = x
+print(x)
+print(y)
+x[0] = 0
+print(x)
+print(y)
+```
+
+### Solution
+
+Click [here](solutions/variables/mutable_objects.md) to view the solution

solutions/numbers/what_is_the_result.md

@@ -0,0 +1,13 @@
+## What is the result?
+
+What is the value of each of the following variables?
+
+1. `x = 5,000`
+2. `x = 5_000`
+3. `x = 5_0_0`
+
+### Solution
+
+1. `(5,0)`
+2. `5000`
+3. `500`

solutions/variables/copying_variables.md

@@ -0,0 +1,9 @@
+## Copying Variables
+
+1. True or False?
+
+Running `var = 3` creates an object. Running `another_var = var` creates another object with the value of `var`
+
+### Solution
+
+False. `another_var = var` makes `another_var` to point to the same object `var` points to. It doesn't creates another object.

solutions/variables/mutable_objects.md

@@ -0,0 +1,22 @@
+## Mutable Objects
+
+1. What would be the output of the following program? explain
+
+```
+x = [1, 2 ,3]
+y = x
+print(x)
+print(y)
+x[0] = 0
+print(x)
+print(y)
+```
+
+### Solution
+
+```
+[1, 2, 3]
+[1, 2, 3]
+[0, 2, 3]
+[0, 2, 3]
+```