#6 Arrays in Python (virtual)

import array as arr

numbers = arr.array('i',[10,20,30])

print(numbers[0]) # gets the 1st element
print(numbers[1]) # gets the 2nd element
print(numbers[2]) # gets the 3rd element

#output

#10
#20
#30

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"""
Pattern:
  * * * *
   * * *
    * *
     *
     *
    * *
   * * *
  * * * *
"""

n = int(input("Enter no.: "))
for i in range(1, n):
          print(" " * i , "* " * (n-i))
         
for i in range(1, n):
          print(" " * (n - i ), "* " * i)       
                   
# @Python_Codes_Pro

All Codes
@C_Code5
@CPP_Coding
@Python_Codes_Pro
@Java_Codes_Pro
@jsCode0

Discussion
@bca_mca_btech

Common techniques for using the set() function in Python:

1. Create a set from a list:

my_list = [1, 2, 2, 3, 3, 3]
my_set = set(my_list)


2.Add an item to a set:

my_set = {1, 2, 3}
my_set.add(4)


3.Remove an item from a set by its value:

my_set = {1, 2, 3}
my_set.remove(3)


4.Check if an item is in a set:

my_set = {1, 2, 3}
if 3 in my_set:
print("The item is in the set.")


5.Get the length of a set:

my_set = {1, 2, 3}
set_length = len(my_set)


6.Loop through the items in a set:

my_set = {1, 2, 3}
for item in my_set:
print(item)


7.Get the union of two sets:

set1 = {1, 2, 3}
set2 = {3, 4, 5}
union_set = set1.union(set2)


8.Get the intersection of two sets:

set1 = {1, 2, 3}
set2 = {3, 4, 5}
intersection_set = set1.intersection(set2)

// @python_codes_pro

Some function of list

fruits = ['orange', 'apple', 'pear', 'banana', 'kiwi', 'apple', 'banana']

#gives_count_of_apples
fruits.count('apple')
2

fruits.count('tangerine')
0

#to_get_index_of_banana
fruits.index('banana')
3

#Find_next_banana_starting_a_position_4
fruits.index('banana', 4)
6

#to_reverse_fruits_list
fruits.reverse()
fruits
['banana', 'apple', 'kiwi', 'banana', 'pear', 'apple', 'orange']

#to_add_item_at_the_end_of_the_list
fruits.append('grape')
fruits
['banana', 'apple', 'kiwi', 'banana', 'pear', 'apple', 'orange', 'grape']

#sort_the_fruits_list
fruits.sort()
fruits
['apple', 'apple', 'banana', 'banana', 'grape', 'kiwi', 'orange', 'pear']

#to_delete_the_last_item_in_the_list
fruits.pop()
'pear'

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my_set = {1, 2, 3}
for item in my_set:
    print(item)

set1 = {1, 2, 3}
set2 = {3, 4, 5}
union_set = set1.union(set2)
print(union_set)

my_set = {1, 2, 3}
if 3 in my_set:
    print("The item is in the set.")

# discussion @bca_mca_btech

"""
Pattern:
  * * * *
   * * *
    * *
     *
     *
    * *
   * * *
  * * * *
"""

n = int(input("Enter no.: "))
for i in range(1, n):
          print(" " * i , "* " * (n-i))
         
for i in range(1, n):
          print(" " * (n - i ), "* " * i)       
                   
# @Python_Codes_Pro

my_set = {1, 2, 3}
my_set.remove(3)

print(my_set)

# Intersection [नाम तो सुना होगा]
set1 = {1, 2, 3}
set2 = {3, 4, 5}
intersection_set = set1.intersection(set2)

print(intersection_set)

# Add an item to a set:

my_set = {1, 2, 3}
my_set.add(4)

print(my_set)

# Arithmeitic Operations

var1 = 9 #Variable1
var2 = 3 #Variable2

#Adding
print (var1, '+', var2, '=', var1 + var2)

#Subtracting
print (var1, '-', var2, '=', var1 - var2)

#Multiplying
print (var1, '×', var2, '=', var1 * var2)

#Dividing
print (var1, '÷', var2, '=', var1 / var2)