Python List

List is used to store multiple values. list is created using square bracket.

l = [10, 20, 30, 40, 50]

List indexing

print(l[0]) # 10
print(l[1]) # 20

print(l[0: 3]) # [10, 20, 30]

l[0]= 100
print(l) # 100, 20, 30, 40, 50

count()	Count number of elements of specified value	l=[1,2,3,1] print(l.count(1)) # 2
append()	Append new value to list	l=[1,2,3] l.append(100) print(l) # [1,2,3,100]
clear()	Remove all elements from a list	l=[1,2,3] l.clear() print(l) # []
copy()	Return copy of a list	x=[1,2,3] y=x.copy() print(y) # [1, 2,3]
extend()	Add one list elements to other list	x=[1,2,3] y=[100,200] x.extend(y) print(x) # [1,2,3, 100,200]
index()	Return index of specified item from a list	x=[1,2,3] print(x.index(1)) # 0
insert()	Insert new item at specified index	x=[10, 20, 30] x.insert(0, 100) print(x) # [100, 10, 20, 30]
pop()	Remove last item from a list	x=[10, 20, 30] x.pop() print(x) # [10, 20]
reverse()	Reverse a list	x=[1,2,3] print(x) # [1,2,3] x.reverse() print(x) # [3,2,1]
remove()	Remove the specified item from a list	x=[1,2,3] x.remove(2) print(x) # [1, 3]
sort()	Sort list items in ascending or descending order	x=[1, 21, 3] x.sort() print(x) # [1, 3, 21] x.sort(reverse=True) print(x) # [21, 3, 1]