correction and minor fixes

Author: Asabeneh

02_Day_Variables_builtin_functions/02_variables_builtin_functions.md

@@ -63,7 +63,7 @@ Python Variable Name Rules
 - A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and \_ )
 - Variable names are case-sensitive (firstname, Firstname, FirstName and FIRSTNAME) are different variables)
 
-Let us se valid variable names
+Here are some example of valid variable names:
 
 ```shell
 firstname

04_Day_Strings/04_strings.md

@@ -102,10 +102,10 @@ Now, let us see the use of the above escape sequences with examples.
 ```py
 print('I hope everyone is enjoying the Python Challenge.\nAre you ?') # line break
 print('Days\tTopics\tExercises') # adding tab space or 4 spaces 
-print('Day 1\t3\t5')
-print('Day 2\t3\t5')
-print('Day 3\t3\t5')
-print('Day 4\t3\t5')
+print('Day 1\t5\t5')
+print('Day 2\t6\t20')
+print('Day 3\t5\t23')
+print('Day 4\t1\t35')
 print('This is a backslash  symbol (\\)') # To write a backslash
 print('In every programming language it starts with \"Hello, World!\"') # to write a double quote inside a single quote
 
@@ -328,16 +328,16 @@ print(challenge.expandtabs(10)) # 'thirty    days      of        python'
 
 ```py
 challenge = 'thirty days of python'
-print(challenge.find('y'))  # 16
-print(challenge.find('th')) # 17
+print(challenge.find('y'))  # 5
+print(challenge.find('th')) # 0
 ```
 
 - rfind(): Returns the index of the last occurrence of a substring, if not found returns -1
 
 ```py
 challenge = 'thirty days of python'
-print(challenge.rfind('y'))  # 5
-print(challenge.rfind('th')) # 1
+print(challenge.rfind('y'))  # 16
+print(challenge.rfind('th')) # 17
 ```
 
 - format(): formats string into a nicer output  

05_Day_Lists/05_lists.md

@@ -163,7 +163,7 @@ print(second_last)      # mango
 ### Unpacking List Items
 
 ```py
-lst = ['item','item2','item3', 'item4', 'item5']
+lst = ['item1','item2','item3', 'item4', 'item5']
 first_item, second_item, third_item, *rest = lst
 print(first_item)     # item1
 print(second_item)    # item2
@@ -175,7 +175,7 @@ print(rest)           # ['item4', 'item5']
 ```py
 # First Example
 fruits = ['banana', 'orange', 'mango', 'lemon','lime','apple']
-first_fruit, second_fruit, third_fruit, *rest = lst
+first_fruit, second_fruit, third_fruit, *rest = fruits 
 print(first_fruit)     # banana
 print(second_fruit)    # orange
 print(third_fruit)     # mango

07_Day_Sets/07_sets.md

@@ -48,14 +48,12 @@ Set is a collection of items. Let me take you back to your elementary or high sc
 
 ### Creating a Set
 
-We use curly brackets, {} to create a set or the *set()* built-in function.
+We use the _set()_ built-in function.
 
 - Creating an empty set
 
 ```py
 # syntax
-st = {}
-# or
 st = set()
 ```
 
@@ -80,7 +78,7 @@ We use **len()** method to find the length of a set.
 ```py
 # syntax
 st = {'item1', 'item2', 'item3', 'item4'}
-len(set)
+len(st)
 ```
 
 **Example:**
@@ -131,7 +129,7 @@ fruits.add('lime')
 ```
 
 - Add multiple items using _update()_
-  The *update()* allows to add multiple items to a set. The *update()* takes a list argument.
+  The _update()_ allows to add multiple items to a set. The _update()_ takes a list argument.
 
 ```py
 # syntax
@@ -174,7 +172,6 @@ fruits = {'banana', 'orange', 'mango', 'lemon'}
 removed_item = fruits.pop() 
 ```
 
-
 ### Clearing Items in a Set
 
 If we want to clear or empty the set we use _clear_ method.
@@ -427,7 +424,6 @@ age = [22, 19, 24, 25, 26, 24, 25, 24]
 1. Explain the difference between the following data types: string, list, tuple and set
 2. _I am a teacher and I love to inspire and teach people._ How many unique words have been used in the sentence? Use the split methods and set to get the unique words.
 
-
 🎉 CONGRATULATIONS ! 🎉
 
 [<< Day 6](../06_Day_Tuples/06_tuples.md) | [Day 8 >>](../08_Day_Dictionaries/08_dictionaries.md)

10_Day_Loops/10_loops.md

@@ -127,6 +127,7 @@ while condition:
 count = 0
 while count < 5:
     if count == 3:
+        count = count + 1
         continue
     print(count)
     count = count + 1

17_Day_Exception_handling/17_exception_handling.md

@@ -16,6 +16,7 @@
 [<< Day 16](../16_Day_Python_date_time/16_python_datetime.md) | [Day 18 >>](../18_Day_Regular_expressions/18_regular_expressions.md)
 
 ![30DaysOfPython](../images/30DaysOfPython_banner3@2x.png)
+
 - [📘 Day 17](#-day-17)
   - [Exception Handling](#exception-handling)
   - [Packing and Unpacking Arguments in Python](#packing-and-unpacking-arguments-in-python)
@@ -128,6 +129,7 @@ I alway run.
 ```
 
 It is also shorten the above code as follows:
+
 ```py
 try:
     name = input('Enter your name:')
@@ -223,9 +225,9 @@ print(sum_all(1, 2, 3, 4, 5, 6, 7)) # 28
 def packing_person_info(**kwargs):
     # check the type of kwargs and it is a dict type
     # print(type(kwargs))
-	# Printing dictionary items
+    # Printing dictionary items
     for key in kwargs:
-        print("{key} = {kwargs[key]}")
+        print(f"{key} = {kwargs[key]}")
     return kwargs
 
 print(packing_person_info(name="Asabeneh",
@@ -247,7 +249,7 @@ Like in JavaScript, spreading is possible in Python. Let us check it in an examp
 ```py
 lst_one = [1, 2, 3]
 lst_two = [4, 5, 6, 7]
-lst = [0, *list_one, *list_two]
+lst = [0, *lst_one, *lst_two]
 print(lst)          # [0, 1, 2, 3, 4, 5, 6, 7]
 country_lst_one = ['Finland', 'Sweden', 'Norway']
 country_lst_two = ['Denmark', 'Iceland']
@@ -257,7 +259,7 @@ print(nordic_countries)  # ['Finland', 'Sweden', 'Norway', 'Denmark', 'Iceland']
 
 ## Enumerate
 
-If we are interested in an index of a list, we use *enumerate* built-in function to get the index of each item in the list.
+If we are interested in an index of a list, we use _enumerate_ built-in function to get the index of each item in the list.
 
 ```py
 for index, item in enumerate([20, 30, 40]):
@@ -301,4 +303,4 @@ print(fruits_and_veges)
 
 🎉 CONGRATULATIONS ! 🎉
 
-[<< Day 16](../16_Day_Python_date_time/16_python_datetime.md) | [Day 18 >>](../18_Day_Regular_expressions/18_regular_expressions.md)
+[<< Day 16](../16_Day_Python_date_time/16_python_datetime.md) | [Day 18 >>](../18_Day_Regular_expressions/18_regular_expressions.md)

18_Day_Regular_expressions/18_regular_expressions.md

@@ -59,11 +59,11 @@ import re
 
 To find a pattern we use different set of *re* character sets that allows to search for a match in a string.
 
-* *re.match()*: searches only in the beginning of the first line of the string and returns matched objects if  found, else returns None. 
-* *re.search*: Returns a match object if there is one anywhere in the string, including multiline strings.
-* *re.findall*: Returns a list containing all matches
-* *re.split*:	Takes a string, splits it at the match points, returns a list
-* *re.sub*:  Replaces one or many matches within a string
+- *re.match()*: searches only in the beginning of the first line of the string and returns matched objects if  found, else returns None.
+- *re.search*: Returns a match object if there is one anywhere in the string, including multiline strings.
+- *re.findall*: Returns a list containing all matches
+- *re.split*: Takes a string, splits it at the match points, returns a list
+- *re.sub*:  Replaces one or many matches within a string
 
 #### Match
 
@@ -129,7 +129,7 @@ substring = txt[start:end]
 print(substring)       # first
 ```
 
-As you can see, search is much better than match because it can look for the pattern throughout the text. Search returns a match object with a first match that was found, otherwise it returns _None_. A much better *re* function is *findall*. This function checks for the pattern through the whole string and returns all the matches as a list.
+As you can see, search is much better than match because it can look for the pattern throughout the text. Search returns a match object with a first match that was found, otherwise it returns *None*. A much better *re* function is *findall*. This function checks for the pattern through the whole string and returns all the matches as a list.
 
 #### Searching for All Matches Using *findall*
 
@@ -240,38 +240,39 @@ matches = re.findall(regex_pattern, txt)
 print(matches)  # ['Apple', 'apple']
 
 ```
+
 * []:  A set of characters
-  * [a-c] means, a or b or c
-  * [a-z] means, any letter from a to z
-  * [A-Z] means, any character from A to Z
-  * [0-3] means, 0 or 1 or 2 or 3
-  * [0-9] means any number from 0 to 9
-  * [A-Za-z0-9] any single character, that is a to z, A to Z or 0 to 9
-* \\:  uses to escape special characters
-  * \d means: match where the string contains digits (numbers from 0-9)
-  * \D means: match where the string does not contain digits
-* . : any character except new line character(\n)
-* ^: starts with
-  * r'^substring' eg r'^love', a sentence that starts with a word love
-  * r'[^abc] means not a, not b, not c.
-* $: ends with
-  * r'substring$' eg r'love$', sentence  that ends with a word love
-* *: zero or more times
-  * r'[a]*' means a optional or it can occur many times.
-* +: one or more times
-  * r'[a]+' means at least once (or more)
-* ?: zero or one time
-  *  r'[a]?' means zero times or once
-* {3}: Exactly 3 characters
-* {3,}: At least 3 characters
-* {3,8}: 3 to 8 characters
-* |: Either or
-  * r'apple|banana' means either apple or a banana
-* (): Capture and group
+  - [a-c] means, a or b or c
+  - [a-z] means, any letter from a to z
+  - [A-Z] means, any character from A to Z
+  - [0-3] means, 0 or 1 or 2 or 3
+  - [0-9] means any number from 0 to 9
+  - [A-Za-z0-9] any single character, that is a to z, A to Z or 0 to 9
+- \\:  uses to escape special characters
+  - \d means: match where the string contains digits (numbers from 0-9)
+  - \D means: match where the string does not contain digits
+- . : any character except new line character(\n)
+- ^: starts with
+  - r'^substring' eg r'^love', a sentence that starts with a word love
+  - r'[^abc] means not a, not b, not c.
+- $: ends with
+  - r'substring$' eg r'love$', sentence  that ends with a word love
+- *: zero or more times
+  - r'[a]*' means a optional or it can occur many times.
+- +: one or more times
+  - r'[a]+' means at least once (or more)
+- ?: zero or one time
+  - r'[a]?' means zero times or once
+- {3}: Exactly 3 characters
+- {3,}: At least 3 characters
+- {3,8}: 3 to 8 characters
+- |: Either or
+  - r'apple|banana' means either apple or a banana
+- (): Capture and group
 
 ![Regular Expression cheat sheet](../images/regex.png)
 
-Let us use examples to clarify the meta characters above 
+Let us use examples to clarify the meta characters above
 
 ### Square Bracket
 
@@ -367,7 +368,7 @@ print(matches)  # ['6', '2019', '8', '2021']
 
 ### Cart ^
 
-* Starts with
+- Starts with
 
 ```py
 txt = 'This regular expression example was made on December 6,  2019 and revised on July 8, 2021'
@@ -376,7 +377,7 @@ matches = re.findall(regex_pattern, txt)
 print(matches)  # ['This']
 ```
 
-* Negation
+- Negation
 
 ```py
 txt = 'This regular expression example was made on December 6,  2019 and revised on July 8, 2021'
@@ -388,7 +389,9 @@ print(matches)  # ['6,', '2019', '8', '2021']
 ## 💻 Exercises: Day 18
 
 ### Exercises: Level 1
+
  1. What is the most frequent word in the following paragraph?
+
 ```py
     paragraph = 'I love teaching. If you do not love teaching what else can you love. I love Python if you do not love something which can give you all the capabilities to develop an application what else can you love.
 ```
@@ -423,9 +426,9 @@ print(matches)  # ['6,', '2019', '8', '2021']
 2. The position of some particles on the horizontal x-axis are -12, -4, -3 and -1 in the negative direction, 0 at origin, 4 and 8 in the positive direction. Extract these numbers from this whole text and find the distance between the two furthest particles.
 
 ```py
-points = ['-1', '2', '-4', '-3', '-1', '0', '4', '8']
-sorted_points =  [-4, -3, -1, -1, 0, 2, 4, 8]
-distance = 8 -(-4) # 12
+points = ['-12', '-4', '-3', '-1', '0', '4', '8']
+sorted_points =  [-12, -4, -3, -1, -1, 0, 2, 4, 8]
+distance = 8 -(-12) # 20
 ```
 
 ### Exercises: Level 2
@@ -453,4 +456,4 @@ distance = 8 -(-4) # 12
 
 🎉 CONGRATULATIONS ! 🎉
 
-[<< Day 17](../17_Day_Exception_handling/17_exception_handling.md) | [Day 19>>](../19_Day_File_handling/19_file_handling.md)
+[<< Day 17](../17_Day_Exception_handling/17_exception_handling.md) | [Day 19>>](../19_Day_File_handling/19_file_handling.md)