Variable is a container that is used to store values of any above mentioned data type. for example:-

name = "Khurram Arshad" x = 12

y = 10.23

z = 2 + 3j

my_list = [ 1, 2, 11, "wNeuron", 3.34, 2-4j ]

my_tuple = ( 1, 2, 11, "wNeuron", 3.34, 2-4j ) my_range = range(1,10)

my_dict = { "name" : "wNeuron", "contact": "03124000464" } my_set = { 1, 2, 11, "wNeuron", 3.34, 2-4j }

my_frozen_set = frozenset({ 1, 2, 11, "wNeuron", 3.34, 2-4j }) is_active = True

is_active = False

arr = bytes(name, 'utf-8') #output will be b'Khurram Arshad' value = None

name = "Geeks for Geeks!"

name

'Geeks for Geeks!'

name[0]

'G'

name[6]

'f'

name[-2]

's'

name[0:5]

'Geeks'

name[-10:-2]

'for Geek'

name[0:10:3]

'Gkf '

name[-10:-2:3]

'f e'

syntax:-

var_name[start_index : end_index : step_size]

sentence = "hello, I Am doing MASTERS in Machine learning from wNeuron."

type(sentence)

str

sentence.capitalize() # Converts the first character to upper case

'Hello, i am doing masters in machine learning from wneuron.'

text = "HELLO, How are YoU"

text.casefold() # Converts string into lower case

'hello, how are you'

txt = "I love apples, apple are my favorite fruit."

txt.count("apple") # Returns the number of times a specified value occurs in a strin 2

my_txt = "Hello, welcome to my world."

txt.endswith(".") # Returns true if the string ends with the specified value True

txt_1 = "Hello, welcome to my world."

txt_1.find("welcome") # Searches the string for a specified value and returns the po 7

price_txt = "For only {price} dollars!"

"For only {num} dollars! {price}".format(price=12 ,num=10)

'For only 10 dollars! 12'

price_txt.format(price = 49) # Formats specified values in a string

'For only 49 dollars!'

price_txt_1 = "For only {price:.2f} dollars!"

price_txt_1.format(price = 49)

'For only 49.00 dollars!'

price_txt_2 = "For only {} dollars!"

price_txt_2.format(49.99)

'For only 49.99 dollars!'

simple_text = "my name is {}, and age is {}"

simple_text.format("Khurram", 70)

'my name is Khurram, and age is 70'

my_para = "i started my journy of life in [1980], completed masters in mathematics from [University of Punjab]."

# solution

my_para = "i started my journy of life in [1980], completed masters in mathematics f

temp1 = my_para.replace("[","$")

temp1

'i started my journy of life in $1980], completed masters in mathematics f

rom $University of Punjab] '

my_new_para = temp1.replace("]","") my_new_para

'i started my journy of life in 1980, completed masters in mathematics fro

m University of Punjab '

roll_number = 1244

type(roll_number) int

price = 12.33

type(price)

float

z = 2+3j

type(z)

complex

my_list = [ 1, 2, 11, "wNeuron", 3.34, 2-4j ]

type(my_list) list

my_list[0] 1

my_list[-1]

(2-4j)

my_list[0:4]

[1, 2, 11, 'wNeuron']

my_list[-3:-1]

['wNeuron', 3.34]

my_list[0:5:3]

[1, 'wNeuron']

color_list = ["red", "green"]

len(color_list) # getting length of a list that how many items a list contains 2

color_list.append("yellow") # append new items into a list

color_list

['red', 'green', 'yellow']

new_color_list = ['blue', 'purple', 'orannge']

color_list.extend(new_color_list) # Add the elements of a list, to the end of the cu

color_list

['red', 'green', 'yellow', 'blue', 'purple', 'orannge']

color_list.insert(1, "wNeuron") # Adds an element at the specified position

color_list

['red', 'wNeuron', 'green', 'yellow', 'blue', 'purple', 'orannge']

color_list.pop(2) # Removes the element at the specified position

'green'

color_list

['red', 'wNeuron', 'yellow', 'blue', 'purple', 'orannge']

color_list.remove("yellow") # Removes the first item with the specified value

color_list

['red', 'wNeuron', 'blue', 'purple', 'orannge']

num_list = [12, 1, 23, 13]

num_list.sort() #Sorts the list

num_list

[1, 12, 13, 23]

num_list.reverse() # Reverses the order of the list

num_list

[23, 13, 12, 1]

roll_numbers = (1100, 1101, 1102)

type(roll_numbers) tuple

roll_numbers[0]

1100

roll_numbers[2]

1102

random_numbers = (1, 1, 12, 13, 1, 12)

random_numbers.count(12) # Returns the number of times a specified value occurs in a 2

random_numbers.index(13) #Searches the tuple for a specified value and returns the 3

personal_details = { 'name': "Khurram", 'age': 78,

'contact': "03124000464",

'address': "Lahore, Punjab, Pakistan",

}

type(personal_details) dict

personal_details["name"]

'Khurram'

personal_details["address"]

'Lahore, Punjab, Pakistan'

personal_details["postal_code"] = 54600

personal_details

{'name': 'Khurram', 'age': 78,

'contact': '03124000464',

'address': 'Lahore, Punjab, Pakistan', 'postal_code': 54600}

personal_details.items() # Returns a list containing a tuple for each key value pair

dict_items([('name', 'Khurram'), ('age', 78), ('contact', '03124000464'), ('address', 'Lahore, Punjab, Pakistan')])

personal_details.keys() # Returns a list containing the dictionary's keys

dict_keys(['name', 'age', 'contact', 'address'])

personal_details.values() # Returns a list of all the values in the dictionary dict_values(['Khurram', 78, '03124000464', 'Lahore, Punjab, Pakistan'])

my_set = {1, 2, "khurram", 2, 3}

type(my_set) set

my_set

{1, 2, 3, 'khurram'}

my_set[0]

-

TypeError Traceback (most recent call last)

<ipython-input-166-158c424478a1> in <module>

----> 1 my_set[0]

TypeError: 'set' object is not subscriptable

set_to_list = list(my_set)

set_to_list

['khurram', 1, 2, 3]

type(set_to_list) list

A = {1,2,3}

A.add("wNeuron") # Adds an element to the set

A

{1, 2, 3, 'wNeuron'}

B = {2, 3, 5, 7}

A_intersection_B = A.intersection(B) # Returns a set, that is the intersection of tw

A_intersection_B

{2, 3}

A.pop() # Removes an element from the set 1

A

{2, 3, 'wNeuron'}

A.remove('wNeuron') # Removes the specified element

A

{2, 3}

X = {10,11,12}

f_set = frozenset(X)

f_set

frozenset({10, 11, 12})

f_set.add(13)

-

AttributeError Traceback (most recent call last)

<ipython-input-189-a5fe8fb3ef2b> in <module>

----> 1 f_set.add(13)

AttributeError: 'frozenset' object has no attribute 'add'

status = True

type(status) bool

is_active = False

type(is_active)

bool

initial = None

type(initial)

NoneType

my_para = "i started my journy of life in 1980"

# solution

my_para = "i started my journy of life in 1980"

working_lst = my_para.split(" ")

working_lst

['i', 'started', 'my', 'journy', 'of', 'life', 'in', '1980']

working_lst.remove("my")

working_lst.remove("journy")

working_lst.remove("of")

working_lst.remove("life")

working_lst

['i', 'started', 'in', '1980']

working_lst[0] + " " + working_lst[1] + " " + working_lst[2]+ " " + working_lst[3]

'i started in 1980'

my_list = ["red", "blue", "orange", "red", "red", "blue"]

# solution

my_list = ["red", "blue", "orange", "red", "red", "blue"] my_set = set(my_list)

new_unique_list = list(my_set)

new_unique_list

['orange', 'blue', 'red']

my_list = ["red", "blue", "orange"]

# solution

my_list = ["red", "blue", "orange"] my_list.append("Green") my_list.append("Yellow")

my_list

['red', 'blue', 'orange', 'Green', 'Yellow']

my_dict = {"name": "Ali", "age": 13}

# solution

my_dict = {"name": "Ali", "age": 13} my_dict["cell_no"]= "03124000464" my_dict

{'name': 'Ali', 'age': 13, 'cell_no': '03124000464'}

name_of_user: str age: float no_of_brothers: int

names_of_brothers: list cell_numbers: set

experience: list of dicts

experience is also a list of dicts, each dict must have the following keys and values

company_name: str join_date: str

end_date: str

no_of_years_worked: float

Double-click (or enter) to edit

# solution

print("my name is khurram") my name is khurram

a = 12

print(a)

12

age = 12

print("age of Ali is :", age) age of Ali is : 12

print("a"*5)

aaaaa

name = input("Enter your name: ") print("your name is :", name)

Enter your name: Khurram your name is : Khurram