List Methods in Python?

Python Server Side Programming Programming

Python provides some very useful list methods that we can use to perform list operation very easily.

Below are the list of python built-in methods which we can use on list:

append(x)

Adds an element at the end of the list

Example

#Append
lst = ['Hello', 'Python']
print(lst)
lst.append('Tutorialspoint')
print(lst)

Output

['Hello', 'Python']
['Hello', 'Python','Tutorialspoint']

clear()

Removes all the elements from the list

Example

#clear
lst = ['Hello','Python','Tutorialspoint']
print(lst)
lst.clear()
print(lst)

Output

['Hello', 'Python', 'Tutorialspoint']
[]

copy()

Returns a shallow copy of the list.

Example

#COPY()
#Without copy
lst = ['Hello', 'Python', 'Tutorialspoint']
lst1 = lst
lst1.append('Java')
print(lst)
print(lst1)
#With copy
lst = ['Hello', 'Python', 'Tutorialspoint']
lst1 = lst.copy()
lst1.append("Java")
print(lst)
print(lst1)

Output

['Hello', 'Python', 'Tutorialspoint', 'Java']
['Hello', 'Python', 'Tutorialspoint', 'Java']
['Hello', 'Python', 'Tutorialspoint']
['Hello', 'Python', 'Tutorialspoint', 'Java']

count()

Returns the number of elements with the specified value.

Example

lst = ['Hello', 'Python', 'Tutorialspoint', 'Python']
print(lst.count("Python"))
print(lst.count("Tutorialspoint"))
print(lst.count(" "))

Output

2
1
0

extend (iterables)

Add the elements of a list (or any iterable), to the end of the current list

Example

#extend(iterables)
lst = ['Hello', 'Python']
print(lst)
lst.extend(['Java', 'CSharp'])
print(lst)

Output

['Hello', 'Python']
['Hello', 'Python', 'Java', 'CSharp']

index(x[,start[, end]])

Returns the index of the first element with the specified value

Example

#index()
lst = ['Hello', 'Python', 'Tutorialspoint', 'Python']
print(lst.index('Python'))
print(lst.index("Python", 2))

Output

1
3

insert(i, x)

Adds an element at the specified position

Example

lst = ['Hello', 'Python', 'Tutorialspoint', 'Python']
print(lst)
lst.insert(0, "CPlusPlus")
print(lst)
lst.insert(3, "Java")
print(lst)

Output

['Hello', 'Python', 'Tutorialspoint', 'Python']
['CPlusPlus', 'Hello', 'Python', 'Tutorialspoint', 'Python']
['CPlusPlus', 'Hello', 'Python', 'Java', 'Tutorialspoint', 'Python']

pop([i])

Removes the element at the specified position

Example

#pop()
lst = ['CPlusPlus', 'Hello', 'Python', 'Java', 'Tutorialspoint', 'Python']
print(lst)
#Without index
lst.pop()
print(lst)
#With Index
lst.pop(3)
print(lst)

Output

['CPlusPlus', 'Hello', 'Python', 'Java', 'Tutorialspoint', 'Python']
['CPlusPlus', 'Hello', 'Python', 'Java', 'Tutorialspoint']
['CPlusPlus', 'Hello', 'Python', 'Tutorialspoint']

remove(x)

Removes the first item with the specified value

Example

#Remove
lst = ['CPlusPlus', 'Hello', 'Python', 'Java', 'Tutorialspoint', 'Python']
print(lst)
lst.remove('Python')
print(lst)

Output

['CPlusPlus', 'Hello', 'Python', 'Java', 'Tutorialspoint', 'Python']
['CPlusPlus', 'Hello', 'Java', 'Tutorialspoint', 'Python']

reverse()

Reverses the order of the list

Example

#reverse()
lst = ['CPlusPlus', 'Hello', 'Python', 'Java', 'Tutorialspoint', 'Python']
print(lst)
lst.reverse()

Output

['CPlusPlus', 'Hello', 'Python', 'Java', 'Tutorialspoint', 'Python']
['Python', 'Tutorialspoint', 'Java', 'Python', 'Hello', 'CPlusPlus']

sort(key = None, reverse = False)

Sorts the list

Example

#sort()
lst = [2, 3, 7, 1, 13, 8, 49]
print(lst)
#default
lst.sort()
print(lst)
#reverse = True
lst.sort(reverse = True)
print(lst)

Output

[2, 3, 7, 1, 13, 8, 49]
[1, 2, 3, 7, 8, 13, 49]
[49, 13, 8, 7, 3, 2, 1]

Arjun Thakur

Published on 02-May-2019 10:33:13

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