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:
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Python: Tips of the Day
Find current directory and file's directory:
To get the full path to the directory a Python file is contained in, write this in that file:
import os dir_path = os.path.dirname(os.path.realpath(__file__))
(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)
To get the current working directory use
import os cwd = os.getcwd()
Documentation references for the modules, constants and functions used above:
- The os and os.path modules.
- The __file__ constant
- os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
- os.path.dirname(path) (returns "the directory name of pathname path")
- os.getcwd() (returns "a string representing the current working directory")
- os.chdir(path) ("change the current working directory to path")
Ref: https://bit.ly/3fy0R6m
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