Lists
Lists are the ordered collection of items and can be written as comma separated values inside square bracket []. You can access the element of a list by using indexes inside square bracket. The index starts from 0 and goes up to the (number of elements in the list - 1) and the first element is at index 0. So, a list having 6 elements will have indices from 0 to 5.
#Creating a list of 5 fruits
fruits = ['orange', 'apple', 'banana', 'apple', 'mango']
#Print element at index 2
print(fruits[2]) ##it prints banana
Lists can have duplicate elements.
#lists can also have different datatypes
my_list = ['candy', 10, 2.5]
Length of the list
You can get the length of the list by using len(list) function and the list name is passed as the parameter.
length = len(fruits) ##Now length = 5
Append an element in the list
Appending an element can be done by the list.append(x) function where x is the element that you want to append. It adds the element at the end of the list.
#Before the list is ['orange', 'apple', 'banana', 'apple', 'mango']
fruits.append('lemon')
#Now the list is ['orange', 'apple', 'banana', 'apple', 'mango', 'lemon']
Insert an element at a specific index
You can insert an element at specific index by of a list by list.insert(i, x) function. Here i is the index where you want to insert and x is the element that you want insert.
fruits.insert(1, 'guava')
#Now the list is ['orange', 'guava', 'apple', 'banana', 'apple', 'mango', 'lemon']
Remove an element from the list
list.remove(x) function searches for the first instance of the given element x and removes it from the list.
fruits.remove('apple')
#Now the list is ['orange', 'guava', 'banana', 'apple', 'mango', 'lemon']
list.remove(x) throws a value error if the element x is not present in the list.
Remove an element at specific position
list.pop(i) function removes the element at the index i.
fruits.pop(0)
#Now the list is ['guava', 'banana', 'apple', 'mango', 'lemon']
If you don’t specify the index,list.pop() then it removes the last element from the list.
Reverse the elements of the list
list.reverse() function reverse the elements of the list.
fruits.reverse()
#Now the list is ['lemon', 'mango', 'apple', 'banana', 'guava']
Get the minimum and maximum element of the list
min(list) function returns the minimum element of the list and the maximum element can be found by using the max(list) function.
my_list = [4, 1, 2, 5, 3] ## Defining a new list of Integers
print(min(my_list)) ## prints 1, the minimum element of my_list
print(max(my_list)) ## prints 5, the maximum element of my_list