How do you check if all elements in list are same in Python?

Python | Check if all elements in a List are same

Given a list, write a Python program to check if all the elements in given list are same.

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Python | Check if all elements in a List are same
Python - Check if all elements in a List are same
Example how to checks if a list contains the same elements in Python
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Check if all elements in a List are same
Python – Check if all elements in a List are the same
Python: Check if all the elements in a list are equal
Method 1: By comparing each element of the list with the first element using a loop
Method 2: Using all() method to compare all the elements in the list in a single statement
Method 3: Using count() method
Method 4: Using set() method
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Example:

Input: ['Geeks', 'Geeks', 'Geeks', 'Geeks', ] Output: Yes Input: ['Geeks', 'Is', 'all', 'Same', ] Output: No

There are various ways we can do this task. Let’s see different ways we can check if all elements in a List are same.

Method #1: Comparing each element.

# Python program to check if all 
# ments in a List are same 

def ckeckList(lst):

ele = lst[0]

chk = True

# Comparing each element with first item

for item in lst:

if ele != item:

chk = False

break;

if (chk == True): print("Equal")

else: print("Not equal")

# Driver Code 

lst = ['Geeks', 'Geeks', 'Geeks', 'Geeks', ]
ckeckList(lst)

Output:

Equal

But In Python, we can do the same task in much interesting ways.

Method #2: Using all() method

# Python program to check if all 
# elements in a List are same 

res = False

def chkList(lst):

if len(lst) < 0 :

res = True

res = all(ele == lst[0] for ele in lst)

if(res):

print("Equal")

else:

print("Not equal")

# Driver Code 

lst = ['Geeks', 'Geeks', 'Geeks', 'Geeks']
chkList(lst)

Output:

Equal

Method #3: Using count() method

# Python program to check if all 
# elements in a List are same 

res = False

def chkList(lst):

if len(lst) < 0 :

res = True

res = lst.count(lst[0]) == len(lst)

if(res):

print("Equal")

else:

print("Not equal")

# Driver Code 

lst = ['Geeks', 'Geeks', 'Geeks', 'Geeks']
chkList(lst)

Output:

Equal

Method #4: Using set data structure
Since we know there cannot be duplicate elements in a set, we can use this property to check whether all the elements are same or not.

# Python program to check if all 
# elements in a List are same 

def chkList(lst):

return len(set(lst)) == 1

# Driver Code 

lst = ['Geeks', 'Geeks', 'Geeks', 'Geeks']

if chkList(lst) == True: print("Equal")

else: print("Not Equal")

Output:

Equal

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Python - Check if all elements in a List are same

PythonServer Side ProgrammingProgramming

Sometimes we come across the need to check if we have one single value repeated in a list as list elements. We can check for such scenario using the below python programs. There are different approaches.

Example how to checks if a list contains the same elements in Python

Simple example code.

Using all() method

The all() method applies the comparison for each element in the list. If all same then return true.

lst = ['A', 'A', 'A', 'A'] result = all(element == lst[0] for element in lst) print(result)

Output:

Using for Loop

In this method, we are comparing each element. Take the first element from the list and use a for loop to keep comparing each element with the first element.

def check_list(lst): ele = lst[0] chk = True # Comparing each element with first item for item in lst: if ele != item: chk = False break if not chk: print("Not equal") else: print("Equal") # Test code lst = ['A', 'A', 'A', 'A'] check_list(lst)

Output: Equal

Using Count() method

A simple count of how many times an element occurs in the list. If its occurrence count is equal to the length of the list, then it means all elements in the list are the Same i.e.

lst = ['A', 'A', 'A', 'A'] result = lst.count(lst[0]) == len(lst) print(result)

Output: True

Do comment if you have any doubts and suggestions on this Python list tutorial.

Note: IDE:PyCharm2021.3 (Community Edition)
Windows 10
Python 3.10.1
AllPython Examplesare inPython3, so Maybe its different from python 2 or upgraded versions.

Degree in Computer Science and Engineer: App Developer and has multiple Programming languages experience. Enthusiasm for technology & like learning technical.

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Check if all elements in a List are same

In this article, we will learn to check that all elements in a list are the same or not in Python. We will use some built-in functions, simple algorithms, and some custom code as well to better understand the problem. Let's first have a quick look over what is a list in Python.

Python – Check if all elements in a List are the same

June 26, 2021October 10, 2021 0 Comments determine if all items of a list are the same item, how to check if two elements in a list are the same python, python check if all items in list equal a value

In this tutorial, we are going to see different ways to check if all the items in a given list are the same.

Using Set
Using all() method
Using count() method

Check if all elements in a List are the same using Set

Set is a type of collection in Python, just like list and tuple. Set is different because the elements do not have duplicates, unlike list and tuple. All the elements of the set are unique.

Here is a simple program with which you can check if all the items in the list are the same.

listOfColor = ['blue','blue','blue','blue'] if(len(set(listOfColor))==1): print("All items in the list are the same") else: print("All items in the list are not the same")

Output:

All items in the list are the same

Check if all elements in a List are the same using all() method

The all() function is a function that takes an iterable as input and returns “true” if all elements of that input are “true”. Otherwise, “false”.

The easiest way is to check if all the items in the list are the same as the first item in the list.

listOfColor = ['blue','blue','blue','blue'] if all(x == listOfColor[0] for x in listOfColor): print("All items in the list are the same") else: print("All items in the list are not the same")

Output:

All items in the list are the sameCheck if all elements in a List are the same using count() method

count() returns the number of occurrences of a given item in the list.

We call the count() function on the list with the first element of the list as an argument. If its number of occurrences is equal to the length of the list, it means that all the elements of the list are the same.

listOfColor = ['blue','blue','blue','blue'] if listOfColor.count(listOfColor[0]) == len(listOfColor): print("All items in the list are the same") else: print("All items in the list are not the same")

Output:

All items in the list are the same

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Python: Check if all the elements in a list are equal

By Ranjeet V

Hello everyone, in this tutorial, we are going to see how we can write a Python program to check if all the elements in a list are equal. We can accomplish this in many ways. A few are listed here.

Method 1: By comparing each element of the list with the first element using a loop

In this method, we store the value of the first element in a variable and then we create a loop to iterate through all the elements so that we can compare each element to the variable storing the first element. If any element in the list is not equal to the first element then we return false and break the loop. See the code implementation in the below program.

def checkList( list): first = list[0] for elem in list: if elem != first: return False break return True list1 = [1,2,3,4,5] list2 = [1,1,1,1,1] if checkList(list1): print("Elements in list1 are equal") else: print("Elements in list1 are not equal") if checkList(list2): print("Elements in list2 are equal") else: print("Elements in list2 are not equal")

Output:

Elements in list1 are not equal Elements in list2 are equal

Method 2: Using all() method to compare all the elements in the list in a single statement

In this method, the algorithm is the same as above but instead of using a loop we use all() method to compare all the elements with first element. This method returns true if the condition is true for every element of the iterator. See the code.

def checkList( list): first = list[0] return all(elem == first for elem in list) list1 = [1,2,3,4,5] list2 = [1,1,1,1,1] if checkList(list1): print("Elements in list1 are equal") else: print("Elements in list1 are not equal") if checkList(list2): print("Elements in list2 are equal") else: print("Elements in list2 are not equal")

Output:

Elements in list1 are not equal Elements in list2 are equal

Method 3: Using count() method

In this method, we count the number of elements whose value is equal to the value of the first element in the list. If the count is equal to the length of the list, that means elements are equal otherwise not.

See the code for a better understanding.

def checkList( list): first = list[0] return list.count(first) == len(list) list1 = [1,2,3,4,5] list2 = [1,1,1,1,1] if checkList(list1): print("Elements in list1 are equal") else: print("Elements in list1 are not equal") if checkList(list2): print("Elements in list2 are equal") else: print("Elements in list2 are not equal")

Output:

Elements in list1 are not equal Elements in list2 are equal

Method 4: Using set() method

In this method, we can use the set() method to convert the list into a set. Now, if all the elements in the list are equal, the set will contain only one element. See the code below.

def checkList( list): return len(set(list)) == 1 list1 = [1,2,3,4,5] list2 = [1,1,1,1,1] if checkList(list1): print("Elements in list1 are equal") else: print("Elements in list1 are not equal") if checkList(list2): print("Elements in list2 are equal") else: print("Elements in list2 are not equal")

Output:

Elements in list1 are not equal Elements in list2 are equal

Thank you.

Also, read:Find the common elements in two lists in Python