Functions we can use on a Python's list

May 19, 2017 4529

This article is an extension of the ‘Make a list’ chapter of Python. If you need to learn basics then visit the Python course first. You can also practice a good number of questions from practice section.

append

Appends list with an item or adds an item at the end of the list.

a = [1, 2, 3,]
a.append(4) # a --> [1, 2, ,3 4]


count

Counts the number of times an element is appearing in a list.

a = [1, 2, 3, 2, 2]
a.count(2) # 3


extend

Adds a list to another list

a = [1, 2, 3]
b = [4, 5]
a.extend(b) # a --> [1 ,2, 3, 4, 5]


index

Gives the index of the first appearance of an element in a list.

a = [1, 2, 2, 3]
a.index(2) # 1


insert

Inserts an element at a given position

a = [1, 2, 3, 4]
a.insert(1,5) # a --> [1, 5, 2, 3, 4]


max

Gives an element which has the maximum value.

a = [1, 2, 3, 4, 56, 9]
max(a) #56


min

Gives an element which has the minimum value.

a = [1, 2, 3, 4, 56, 9]
min(a) #1


pop

Removes and returns an element at a given position. If no position is specified then it removes and returns the last element.

a = [1, 2, 3, 4, 5, 6]
a.pop(1) # 2
a.pop() # 6


remove

Removes the first element whose value is matched with the given value.

a = [1, 2, 3]
a.remove(1) # a --> [2, 3]


reverse

Reverses a list.

a = [1, 2, 3, 4]
a.reverse() # a --> [4, 3, 2, 1]


sort

Arranges the elements of a list in ascending order.

a = [3, 4, 1, 2]
a.sort() # a --> [1, 2, 3, 4]


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