2. Accessing List Using Slicing Operator

Slicing ማለት የአንድን main list sublist ወይም የፈለግናቸውን elements ለይተን የምናወጣበት መንገድ ነው።

Syntax :

list_name[start : stop : step] 

start : Sliceኡ ዬት እንደሚጀምር represent ያረጋል, default value 0 ነው።

stop : represents the end index where slice should end.

▫️allow የሚደረግ max value = (last index + 1 )
▫️ምንም value ካልተሰጠው የ listኡን last element index as default ይወስዳል።

step : slice በሚደረጉ elements መሀከል ያለውን index value increment represent ያረጋል

አንድን list slice አርገን የምናገኘው ሌላ list ነው።
i.e. it returns a list.

...ይቀጥላል 👍

#Slicing
#Lists

@python_pioneers

Goodnight 😘💤💤

Programming Jokes!!!

1 : A guy walks into a bar and asks for 1.014 root beers.
The bartender says, “I’ll have to charge you extra, that’s a root beer float”.
So the guy says, “In that case, better make it a double.”

2 : 3 Database SQL walked into a noSQL bar
A little while later....
They walked out
Because they COULDN'T FIND A TABLE


3 : The Programmer wife sent him to a grocer store.
Her instructions were "Buy Butter. See if they have eggs, If they do buy 10"

4 : Q: Why do Java Programmers wear glasses?
A: Because they can't C#

Real Programmers don't comment their codes!!
Because If it was hard to write.....
It must be hard to read....

Algorithm : word used by programmers when they do not want to explain
what they did

Keep Calm and LOVE programming!!!!!

Sololearn

#Jokes

@python_pioneers
@python_pioneers

Exercises

Deepen Your Knowledge About List Indexing and Slicing Through These Questions👇 and don't forget to comment your answers

1⃣. What will be the output of the following code?

   my_list = [10, 20, 30, 40, 50]
   print(my_list[1:4])
   

a) [10, 20, 30]

b) [20, 30, 40]

c) [20, 30, 40, 50]

d) [30, 40, 50]

2⃣. Given the list

my_list = ['a', 'b', 'c', 'd', 'e']

, what does

my_list[-3:]

return?

a) ['a', 'b', 'c']

b) ['c', 'd', 'e']

c) ['d', 'e']

d) ['e']

3⃣. What will be the output of the following code?

   my_list = [1, 2, 3, 4, 5, 6]
   print(my_list[::2])
   

a) [1, 2, 3, 4, 5, 6]

b) [1, 3, 5]

c) [2, 4, 6]

d) [6, 5, 4, 3, 2, 1]

4⃣. Which of the following will give you a reversed copy of the list my_list?

a) my_list[::-1]

b) my_list.reverse()

c) reversed(my_list)

d) my_list[:-1]

5⃣. What does the slice my_list[1:-1] do?

a) Returns a list with the first and last elements removed

b) Returns the entire list

c) Returns a list with the first element removed

d) Returns a list with the last element removed

6⃣. What will be the output of the following code?

   my_list = [5, 10, 15, 20, 25, 30]
   print(my_list[1:5:2])
   

a) [10, 20]

b) [10, 15, 20, 25]

c) [10, 20, 30]

d) [10, 25]

7⃣. Given the list

my_list = ['p', 'y', 't', 'h', 'o', 'n']

, what does

my_list[:4]

return?

a) ['o', 'n']

b) ['p', 'y', 't', 'h']

c) ['p', 'y', 't', 'h', 'o']

d) ['t', 'h', 'o', 'n']

8⃣. If

my_list = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

, what does

my_list[2:8:2]

return?

a) [2, 3, 4, 5, 6, 7]

b) [2, 4, 6, 8]

c) [2, 6]

d) [4, 8]

9⃣. What will be the result of the following code?

   my_list = ['apple', 'banana', 'cherry', 'date']
   print(my_list[::3])
   

a) ['apple', 'cherry']

b) ['apple', 'date']

c) ['banana', 'date']

d) ['apple', 'banana', 'cherry', 'date']

🔟. What will be the output of the following code?

    my_list = [100, 200, 300, 400, 500]
    print(my_list[1:5:3])
    

a) [200, 400]

b) [200, 500]

c) [200, 300, 400, 500]

d) [100, 300]

How to modify specific element of a list?

የ አንድን list specific element ብቻ ለይተን modify ማድረግ እንችላለን።

Syntax :
list_name[i] = new element

ለምሳሌ : my_list በሚለው list ውስጥ index 2 ላይ ያለውን element('cap') ወደ 'book' እንቀይር።

my_list = ['bag', 'pen', 'cap', 'pen']

my_list[2] = 'book'
print(my_list)

#Output : ['bag', 'pen', 'book', 'pen']

Old list : ['bag', 'pen', 'cap', 'pen']
Modified list : ['bag', 'pen', 'book', 'pen']

3. index() method

The index() method returns the position at the first occurrence of the specified item (value).

In Python, a method is a function that is associated with a class. It is defined inside the class and can be called using an instance of the class. Methods can perform operations on the data stored in the class and can also modify the state of the object.

ለምሳሌ : የ ከዚህ list የ4ን index ለማወቅ ከፈለግን

new_list = [1, 5, 6, 4, 7]

index_of_4 = new_list.index(4)

#Output : 3

to be cont'd...

@python_pioneers
@python_pioneers

የ25 ብር የአየር ሰዓት የሚያሸልም ጥያቄ

If you're ready show me your 👍

⌚ 3 : 15

@python_pioneers

Please send me only your answers.

Send it to : @Mntsnt_ZP

The winner will be the person who gets the most correct answers in the shortest amount of time.

Good Luck!🤞

@python_pioneers

1. What is the output of the following code?

my_list = [1, 2, 3, 4, 5]
print(my_list[1:4])

A) [1, 2, 3]
B) [2, 3, 4]
C) [2, 3, 4, 5]
D) [1, 2, 3, 4]


2. What is the result of running the following code?

my_list = [1, 2, 3, 4, 5]
new_list = my_list[::-1]
print(new_list)

A) [5, 4, 3, 2, 1]
B) [1, 2, 3, 4, 5]
C) [5, 4, 3, 2]
D) [4, 3, 2, 1]

3. What will be the output of the following code snippet?

my_list = [1, 2, 3, 4, 5]
my_list[2] = 6
print(my_list)

A) [1, 2, 6, 4, 5]
B) [1, 2, 3, 6, 5]
C) [1, 2, 6, 3, 4]
D) [1, 2, 3, 4, 6]

4. What does the following code do?

my_list = [1, 2, 3, 4, 5]
del my_list[2]

A) Removes the element at index 2 from the list
B) Removes the last element from the list
C) Adds the element at index 2 to the list
D) Replaces the element at index 2 with a new value

5. How can you check if a specific value exists in a list in Python?

A) Using the in keyword
B) Using the exists() method
C) Using the exists keyword
D) Using the contains() method

#Quiz
#PrizeWinningQuiz

@python_pioneers
@python_pioneers