lst = []

# ALL THESE METHODS DO NOT RETURN VALUES ---

lst.append('Java')

lst.insert(0, 'Ruby')

lst.insert(1, 'Perl')

lst.extend(['C', 'C++', 'Swift'])

lst.insert(3, 'Go')

lst.append(['.net', 'php'])

lst.extend('python') # extend do iterate where as append do add values

lst.append('Dart')

lst.insert(1, "Python")

lst.extend('1234')

lst.extend([["python", "python"], ["java", "C", "C++"]])

print(lst)

# IT WILL PRINT THE LIST IN VERTICAL MANNER----

from pprint import pprint

lst = []

lst.append('Java')

lst.insert(0, 'Ruby')

lst.insert(1, 'Perl')

lst.extend(['C', 'C++', 'Swift'])

lst.insert(3, 'Go')

lst.append(['.net', 'php'])

lst.extend('python') # extend do iterate where as append do add values

lst.append('Dart')

lst.insert(1, "Python")

lst.extend('1234')

lst.extend([["python", "python"], ["java", "C", "C++"]])

# WE HAVE TO PROVIDE PARTICULAR WIDTH IN WHICH IT WILL INCLUDE ELEMENTS

pprint(lst, width=20)

# FOR REMOVE OR DELETE OPERATIONS---

# item = lst.pop() it returns value and delete last element automatically

# item = list.pop(loc) it returns value and delete the value at specified location

# list.remove(item) if item in the list then delete first occurence of that item

# nums.pop(100) it will show index out of range error

# list.count(item) will return frequency of item in list

# list.index(item) will return first index of item

# list.clear() it will deletes each and every relement in list

# Note:- list should be homogeneous to sort

nums = [1,5,6,2,5,5,3,4,5]

print(nums)

c = nums.count(5)

print(c)

for _ in range(c):

nums.remove(5)

print(nums)

nums.sort()

print(nums)

lang = ['java', 'c', 'c++', 'python', 'ruby', 'perl']

lang.pop()

lang.pop(2)

print(lang)

lang.insert(1,'python')

lang.insert(3, 'python')

print(lang)

lang.remove('python')

i = lang.index('python') # if value find then its ok otherwise it will give value error

print(i)

print(lang)

data1 = [

['sachin', 80],

['rajat', 85],

['simran', 95],

['kushal',100],

['yadavendra', 77]

]

# data1.sort()

print(data1)

# JUST FOR SORT IMPORTED DATA WE IMPORT THIS PACKAGE

from operator import itemgetter

f = itemgetter(2)

lst = ['python', 'java', 'c++']

print(f(lst))

data1.sort(reverse = True, key=itemgetter(1))

print(data1)

print("List does not contain data, it contain references, since list is mutable while using copy function it will copy reference not object...Copy function is used for copying values onlu")

lst11 = lst.copy()

print(lst11)

copy = lst

lst.append(5)

item = copy.pop(0)

print(copy)

print(lst)

lst = [1,2,3,4]

copy = lst[:]

lst.append(5)

item = copy.pop(0)

print(lst)

print(copy)