Python: Check if the elements of a given list are unique or not
Python List: Exercise - 115 with Solution
Write a Python program to check if the elements of a given list are unique or not.
Sample Solution-1:
Python Code:
def all_unique(test_list):
if len(test_list) > len(set(test_list)):
return False
return True
nums1 = [1,2,4,6,8,2,1,4,10,12,14,12,16,17]
print ("Original list:")
print(nums1)
print("\nIs the said list contains all unique elements!")
print(all_unique(nums1))
nums2 = [2,4,6,8,10,12,14]
print ("\nOriginal list:")
print(nums2)
print("\nIs the said list contains all unique elements!")
print(all_unique(nums2))
Sample Output:
Original list: [1, 2, 4, 6, 8, 2, 1, 4, 10, 12, 14, 12, 16, 17] Is the said list contains all unique elements! False Original list: [2, 4, 6, 8, 10, 12, 14] Is the said list contains all unique elements! True
Pictorial Presentation:


Flowchart:

Visualize Python code execution:
The following tool visualize what the computer is doing step-by-step as it executes the said program:
Sample Solution-2:
- Use set() on the given list to keep only unique occurrences.
- Use len() to compare the length of the unique values to the original list.
Python Code:
def all_unique(test_list):
return len(test_list) == len(set(test_list))
nums1 = [1,2,4,6,8,2,1,4,10,12,14,12,16,17]
print ("Original list:")
print(nums1)
print("\nIs the said list contains all unique elements!")
print(all_unique(nums1))
nums2 = [2,4,6,8,10,12,14]
print ("\nOriginal list:")
print(nums2)
print("\nIs the said list contains all unique elements!")
print(all_unique(nums2))
Sample Output:
Original list: [1, 2, 4, 6, 8, 2, 1, 4, 10, 12, 14, 12, 16, 17] Is the said list contains all unique elements! False Original list: [2, 4, 6, 8, 10, 12, 14] Is the said list contains all unique elements! True
Flowchart:

Visualize Python code execution:
The following tool visualize what the computer is doing step-by-step as it executes the said program:
Python Code Editor:
Have another way to solve this solution? Contribute your code (and comments) through Disqus.
Previous: Write a Python program to extract the nth element from a given list of tuples.
Next: Write a Python program to sort a list of lists by a given index of the inner list.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
Python: Tips of the Day
Decapitalizes the first letter of a string:
Example:
def tips_decapitalize(s, upper_rest=False): return s[:1].lower() + (s[1:].upper() if upper_rest else s[1:]) print(tips_decapitalize('PythonTips')) print(tips_decapitalize('PythonTips', True))
Output:
pythonTips pYTHONTIPS
- Weekly Trends
- Java Basic Programming Exercises
- SQL Subqueries
- Adventureworks Database Exercises
- C# Sharp Basic Exercises
- SQL COUNT() with distinct
- JavaScript String Exercises
- JavaScript HTML Form Validation
- Java Collection Exercises
- SQL COUNT() function
- SQL Inner Join
- JavaScript functions Exercises
- Python Tutorial
- Python Array Exercises
- SQL Cross Join
- C# Sharp Array Exercises
We are closing our Disqus commenting system for some maintenanace issues. You may write to us at reach[at]yahoo[dot]com or visit us at Facebook