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Python Remove Duplicate Elements from a List

In Python, the simplest way to remove duplicate elements from a list is by using the set() function. This method converts the list into a set (which contains only unique elements) and then converts it back to a list. Note that this approach does not preserve the original order.

Method 1: Using set() (Order Not Preserved)

# Original list
my_list = [1, 2, 2, 3, 4, 4, 5, 1]

# Remove duplicates using set
unique_set = set(my_list)

# Convert back to list
unique_list = list(unique_set)

print(unique_list)  # Output: [1, 2, 3, 4, 5] (order may vary)
  

Method 2: Using a for Loop (Order Preserved)

# Original list
names = ['Lim', 'Kim', 'Park', 'Choi', 'Jung', 'Lee', 'Lim', 'Park']

# Create a new list to store unique elements
my_list_unique_ordered = []

# Iterate through the list and add elements only if they are not already in the new list
for name in names:
    if name not in my_list_unique_ordered:
        my_list_unique_ordered.append(name)

print(my_list_unique_ordered)  
# Output: ['Lim', 'Kim', 'Park', 'Choi', 'Jung', 'Lee']
  

Key Points

• set(): Quick and simple, but original order is not preserved.
• for loop: Preserves the order while removing duplicates, slightly slower for large lists.

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These methods allow you to remove duplicate elements from a Python list efficiently, depending on whether you need to preserve the order or not.