big changes

Author: Asabeneh

01_Day_Introduction/helloworld.py

@@ -1,9 +1,9 @@
 # Introduction
 # Day 1 - 30DaysOfPython Challenge
 
-print(2 + 3)   # addition(+)
-print(3 - 1)   # subtraction(-)
-print(2 * 3)   # multiplication(*)
+print(3 + 2)   # addition(+)
+print(3 - 2)   # subtraction(-)
+print(3 * 2)   # multiplication(*)
 print(3 / 2)   # division(/)
 print(3 ** 2)  # exponential(**)
 print(3 % 2)   # modulus(%)
@@ -19,3 +19,5 @@
 print(type({'name':'Asabeneh'})) # Dictionary
 print(type({9.8, 3.14, 2.7}))    # Set
 print(type((9.8, 3.14, 2.7)))    # Tuple
+print(type(3 == 3))              # Bool
+print(type(3 >= 3))              # Bool

02_Day_Variables_builtin_functions/02_variables_builtin_functions.md

@@ -180,7 +180,7 @@ There are several data types in Python. To identify the data type we use the _ty
 ## Checking Data types and Casting
 
 - Check Data types: To check the data type of certain data/variable we use the _type_
-  **Example:**
+  **Examples:**
 
 ```py
 # Different python data types
@@ -193,22 +193,22 @@ city= 'Helsinki'            # str
 age = 250                   # int, it is not my real age, don't worry about it
 
 # Printing out types
-print(type('Asabeneh'))     # str
-print(type(first_name))     # str
-print(type(10))             # int
-print(type(3.14))           # float
-print(type(1 + 1j))         # complex
-print(type(True))           # bool
-print(type([1, 2, 3, 4]))     # list
-print(type({'name':'Asabeneh','age':250, 'is_married':250}))    # dict
-print(type((1,2)))                                              # tuple
-print(type(zip([1,2],[3,4])))                                   # set
+print(type('Asabeneh'))          # str
+print(type(first_name))          # str
+print(type(10))                  # int
+print(type(3.14))                # float
+print(type(1 + 1j))              # complex
+print(type(True))                # bool
+print(type([1, 2, 3, 4]))        # list
+print(type({'name':'Asabeneh'})) # dict
+print(type((1,2)))               # tuple
+print(type(zip([1,2],[3,4])))    # zip
 ```
 
 - Casting: Converting one data type to another data type. We use _int()_, _float()_, _str()_, _list_, _set_
   When we do arithmetic operations string numbers should be first converted to int or float otherwise it will return an error. If we concatenate a number with a string, the number should be first converted to a string. We will talk about concatenation in String section.
 
-  **Example:**
+  **Examples:**
 
 ```py
 # int to float
@@ -229,8 +229,10 @@ print(num_str)                  # '10'
 
 # str to int or float
 num_str = '10.6'
-print('num_int', int(num_str))      # 10
+num_float = float(num_str)
 print('num_float', float(num_str))  # 10.6
+num_int = int(num_float)
+print('num_int', int(num_int))      # 10
 
 # str to list
 first_name = 'Asabeneh'
@@ -281,13 +283,13 @@ Number data types in Python:
 1. Using the _len()_ built-in function, find the length of your first name
 1. Compare the length of your first name and your last name
 1. Declare 5 as num_one and 4 as num_two
-    1. Add num_one and num_two and assign the value to a variable total
-    2. Subtract num_two from num_one and assign the value to a variable diff
-    3. Multiply num_two and num_one and assign the value to a variable product
-    4. Divide num_one by num_two and assign the value to a variable division
-    5. Use modulus division to find num_two divided by num_one and assign the value to a variable remainder
-    6. Calculate num_one to the power of num_two and assign the value to a variable exp
-    7. Find floor division of num_one by num_two and assign the value to a variable floor_division
+1. Add num_one and num_two and assign the value to a variable total
+1. Subtract num_two from num_one and assign the value to a variable diff
+1. Multiply num_two and num_one and assign the value to a variable product
+1. Divide num_one by num_two and assign the value to a variable division
+1. Use modulus division to find num_two divided by num_one and assign the value to a variable remainder
+1. Calculate num_one to the power of num_two and assign the value to a variable exp
+1. Find floor division of num_one by num_two and assign the value to a variable floor_division
 1. The radius of a circle is 30 meters.
     1. Calculate the area of a circle and assign the value to a variable name of _area_of_circle_
     2. Calculate the circumference of a circle and assign the value to a variable name of _circum_of_circle_

04_Day_Strings/04_strings.md

@@ -373,8 +373,9 @@ print(challenge.index(sub_string, 9)) # error
 ```py
 challenge = 'thirty days of python'
 sub_string = 'da'
-print(challenge.rindex(sub_string))  # 8
+print(challenge.rindex(sub_string))  # 7
 print(challenge.rindex(sub_string, 9)) # error
+print(challenge.rindex('on', 8)) # 19
 ```
 
 - isalnum(): Checks alphanumeric character

05_Day_Lists/05_lists.md

@@ -562,7 +562,7 @@ To sort lists we can use _sort()_ method or _sorted()_ built-in functions. The _
     back_end = ['Node','Express', 'MongoDB']
     ```
 
-27. After joining the lists in question 26. Copy the joined list and assign it to a variable full_stack. Then insert Python and SQL after Redux.
+27. After joining the lists in question 26. Copy the joined list and assign it to a variable full_stack, then insert Python and SQL after Redux.
 
 ### Exercises: Level 2
 

07_Day_Sets/07_sets.md

@@ -343,7 +343,7 @@ dragon.difference(python)     # {'d', 'r', 'a', 'g'}
 
 ### Finding Symmetric Difference Between Two Sets
 
-It returns the the symmetric difference between two sets. It means that it returns a set that contains all items from both sets, except items that are present in both sets, mathematically: (A\B) ∪ (B\A)
+It returns the symmetric difference between two sets. It means that it returns a set that contains all items from both sets, except items that are present in both sets, mathematically: (A\B) ∪ (B\A)
 
 ```py
 # syntax
@@ -380,7 +380,7 @@ st2.isdisjoint(st1) # False
 
 ```py
 even_numbers = {0, 2, 4 ,6, 8}
-even_numbers = {1, 3, 5, 7, 9}
+odd_numbers = {1, 3, 5, 7, 9}
 even_numbers.isdisjoint(odd_numbers) # True, because no common item
 
 python = {'p', 'y', 't', 'h', 'o','n'}

08_Day_Dictionaries/08_dictionaries.md

@@ -89,7 +89,7 @@ person = {
     'last_name':'Yetayeh',
     'age':250,
     'country':'Finland',
-    'is_marred':True,
+    'is_married':True,
     'skills':['JavaScript', 'React', 'Node', 'MongoDB', 'Python'],
     'address':{
         'street':'Space street',

09_Day_Conditionals/09_conditionals.md

@@ -29,6 +29,8 @@
     - [If and Or Logical Operators](#if-and-or-logical-operators)
   - [💻 Exercises: Day 9](#-exercises-day-9)
     - [Exercises: Level 1](#exercises-level-1)
+    - [Exercises: Level 2](#exercises-level-2)
+    - [Exercises: Level 3](#exercises-level-3)
 
 # 📘 Day 9
 
@@ -72,7 +74,7 @@ else:
      this part of code runs for false conditions
 ```
 
-**Example: **
+**Example:**
 
 ```py
 a = 3
@@ -82,7 +84,7 @@ else:
     print('A is a positive number')
 ```
 
-The condition above proves false, therefore the else block was executed. How about if our condition is more than two? We could use _ elif_.
+The condition above proves false, therefore the else block was executed. How about if our condition is more than two? We could use _elif_.
 
 ### If Elif Else
 
@@ -99,7 +101,7 @@ else:
 
 ```
 
-**Example: **
+**Example:**
 
 ```py
 a = 0
@@ -118,7 +120,7 @@ else:
 code if condition else code
 ```
 
-**Example: **
+**Example:**
 
 ```py
 a = 3
@@ -137,7 +139,7 @@ if condition:
     code
 ```
 
-**Example: **
+**Example:**
 
 ```py
 a = 0
@@ -163,7 +165,7 @@ if condition and condition:
     code
 ```
 
-**Example: **
+**Example:**
 
 ```py
 a = 0
@@ -185,7 +187,7 @@ if condition or condition:
     code
 ```
 
-**Example: **
+**Example:**
 
 ```py
 user = 'James'
@@ -202,53 +204,60 @@ else:
 
 ### Exercises: Level 1
 
-1.  Get user input using input(“Enter your age: ”). If user is 18 or older, give feedback: You are old enough to drive. If below 18 give feedback to wait for the missing amount of years. Output:
+1. Get user input using input(“Enter your age: ”). If user is 18 or older, give feedback: You are old enough to drive. If below 18 give feedback to wait for the missing amount of years. Output:
+
     ```sh
     Enter your age: 30
     You are old enough to learn to drive.
     Output:
     Enter your age: 15
     You need 3 more years to learn to drive.
     ```
-2.  Compare the values of my_age and your_age using if … else. Who is older (me or you)? Use input(“Enter your age: ”) to get the age as input. You can use a nested condition to print 'year' for 1 year difference in age, 'years' for bigger differences, and a custom text if my_age = your_age. Output:
+
+2. Compare the values of my_age and your_age using if … else. Who is older (me or you)? Use input(“Enter your age: ”) to get the age as input. You can use a nested condition to print 'year' for 1 year difference in age, 'years' for bigger differences, and a custom text if my_age = your_age. Output:
+
     ```sh
     Enter your age: 30
     You are 5 years older than me.
     ```
-3.  Get two numbers from the user using input prompt. If a is greater than b return a is greater than b, if a is less b return a is smaller than b, else a is equal to b. Output:
+
+3. Get two numbers from the user using input prompt. If a is greater than b return a is greater than b, if a is less b return a is smaller than b, else a is equal to b. Output:
 
 ```sh
 Enter number one: 4
 Enter number two: 3
 4 is greater than 3
 ```
 
-    ### Exercises: Level 2
+### Exercises: Level 2
 
    1. Write a code which gives grade to students according to theirs scores:
-   
+
         ```sh
         80-100, A
         70-89, B
         60-69, C
         50-59, D
         0-49, F
         ```
-1. Check if the season is Autumn, Winter, Spring or Summer. If the user input is:
+
+   1. Check if the season is Autumn, Winter, Spring or Summer. If the user input is:
     September, October or November, the season is Autumn.
     December, January or February, the season is Winter.
     March, April or May, the season is Spring
     June, July or August, the season is Summer
-2.  The following list contains some fruits:
+   2. The following list contains some fruits:
+
     ```sh
     fruits = ['banana', 'orange', 'mango', 'lemon']
     ```
-    If a fruit doesn't exist in the list add the fruit to the list and print the modified list. If the fruit exists print('That fruit already exist in the list') 
 
-    ### Exercises: Level 3
+    If a fruit doesn't exist in the list add the fruit to the list and print the modified list. If the fruit exists print('That fruit already exist in the list')
+
+### Exercises: Level 3
 
    1. Here we have a person dictionary. Feel free to modify it!
-   
+
 ```py
         person={
     'first_name': 'Asabeneh',

11_Day_Functions/11_functions.md

@@ -31,6 +31,7 @@
     - [Arbitrary Number of Arguments](#arbitrary-number-of-arguments)
     - [Default and Arbitrary Number of Parameters in Functions](#default-and-arbitrary-number-of-parameters-in-functions)
     - [Function as a Parameter of Another Function](#function-as-a-parameter-of-another-function)
+  - [Testimony](#testimony)
   - [💻 Exercises: Day 11](#-exercises-day-11)
     - [Exercises: Level 1](#exercises-level-1)
     - [Exercises: Level 2](#exercises-level-2)
@@ -48,7 +49,7 @@ A function is a reusable block of code or programming statements designed to per
 
 ### Declaring and Calling a Function
 
-When we make a function, we call it declaring a function. When we start using the it,  we call it *calling* or *invoking* a function. Function can be declared with or without parameters.
+When we make a function, we call it declaring a function. When we start using the it,  we call it _calling_ or _invoking_ a function. Function can be declared with or without parameters.
 
 ```py
 # syntax
@@ -374,7 +375,8 @@ print(do_something(square_number, 3)) # 27
 🌕 You achieved quite a lot so far.  Keep going! You have just completed day 11 challenges and you are 11 steps a head in to your way to greatness. Now do some exercises for your brain and muscles.
 
 ## Testimony
-Now it is time to express your thoughts about the Author and 30DaysOfPython. You can leave your testimonial on this [link](https://testimonify.herokuapp.com/)
+
+Now it is time to express your thoughts about the Author and 30DaysOfPython. You can leave your testimonial on this [link](https://testimonial-s3sw.onrender.com/)
 
 ## 💻 Exercises: Day 11
 
@@ -401,35 +403,35 @@ print(reverse_list1(["A", "B", "C"]))
 11. Declare a function named add_item. It takes a list and an item parameters. It returns a list with the item added at the end.
 
 ```py
-food_staff = ['Potato', 'Tomato', 'Mango', 'Milk'];
-print(add_item(food_staff, 'Meat'))     # ['Potato', 'Tomato', 'Mango', 'Milk','Meat'];
-numbers = [2, 3, 7, 9];
+food_staff = ['Potato', 'Tomato', 'Mango', 'Milk']
+print(add_item(food_staff, 'Meat'))     # ['Potato', 'Tomato', 'Mango', 'Milk','Meat']
+numbers = [2, 3, 7, 9]
 print(add_item(numbers, 5))      [2, 3, 7, 9, 5]
 ```
 
 12. Declare a function named remove_item. It takes a list and an item parameters. It returns a list with the item removed from it.
 
 ```py
-food_staff = ['Potato', 'Tomato', 'Mango', 'Milk'];
+food_staff = ['Potato', 'Tomato', 'Mango', 'Milk']
 print(remove_item(food_staff, 'Mango'))  # ['Potato', 'Tomato', 'Milk'];
-numbers = [2, 3, 7, 9];
+numbers = [2, 3, 7, 9]
 print(remove_item(numbers, 3))  # [2, 7, 9]
 ```
 
 13. Declare a function named sum_of_numbers. It takes a number parameter and it adds all the numbers in that range.
 
 ```py
 print(sum_of_numbers(5))  # 15
-print(sum_all_numbers(10)) # 55
-print(sum_all_numbers(100)) # 5050
+print(sum_of_numbers(10)) # 55
+print(sum_of_numbers(100)) # 5050
 ```
 
 14. Declare a function named sum_of_odds. It takes a number parameter and it adds all the odd numbers in that range.
 15. Declare a function named sum_of_even. It takes a number parameter and it adds all the even numbers in that - range.
 
 ### Exercises: Level 2
 
-1.  Declare a function named evens_and_odds . It takes a positive integer as parameter and it counts number of evens and odds in the number.
+1. Declare a function named evens_and_odds . It takes a positive integer as parameter and it counts number of evens and odds in the number.
 
 ```py
     print(evens_and_odds(100))

13_Day_List_comprehension/13_list_comprehension.md

@@ -89,7 +89,7 @@ odd_numbers = [i for i in range(21) if i % 2 != 0]  # to generate odd numbers in
 print(odd_numbers)                      # [1, 3, 5, 7, 9, 11, 13, 15, 17, 19]
 # Filter numbers: let's filter out positive even numbers from the list below
 numbers = [-8, -7, -3, -1, 0, 1, 3, 4, 5, 7, 6, 8, 10]
-positive_even_numbers = [i for i in range(21) if i % 2 == 0 and i > 0]
+positive_even_numbers = [i for i in numbers if i % 2 == 0 and i > 0]
 print(positive_even_numbers)                    # [2, 4, 6, 8, 10, 12, 14, 16, 18, 20]
 
 # Flattening a three dimensional array

16_Day_Python_date_time/16_python_datetime.md

@@ -25,7 +25,7 @@
     - [Using *date* from *datetime*](#using-date-from-datetime)
     - [Time Objects to Represent Time](#time-objects-to-represent-time)
     - [Difference Between Two Points in Time Using](#difference-between-two-points-in-time-using)
-    - [Difference Between Two Points in Time Using *timedelata*](#difference-between-two-points-in-time-using-timedelata)
+    - [Difference Between Two Points in Time Using *timedelta*](#difference-between-two-points-in-time-using-timedelta)
   - [💻 Exercises: Day 16](#-exercises-day-16)
 # 📘 Day 16
 
@@ -173,7 +173,7 @@ diff = t2 - t1
 print('Time left for new year:', diff) # Time left for new year: 26 days, 23: 01: 00
 ```
 
-### Difference Between Two Points in Time Using *timedelata*
+### Difference Between Two Points in Time Using *timedelta*
 
 ```py
 from datetime import timedelta