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List Methods in Python?
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]
Updated on 30-Jul-2019 22:30:26
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