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Create Set

Zero-dependency Python snippets for creating sets from lists or iterables using the standard library.

5 snippets available in this sub-category.

Simple

Create set from list

set create list unique data-structures

Create a set from a list to remove duplicates

numbers = [1, 2, 2, 3, 4, 4, 5]
unique_numbers = set(numbers)
print(unique_numbers)  # {1, 2, 3, 4, 5}

Notes

  • Sets automatically remove duplicate elements
  • Order is not preserved (sets are unordered)
  • Useful for deduplication

Create set from string

set string unique characters data-structures

Create a set from a string (unique characters)

letters = set("hello")
print(letters)  # {'h', 'e', 'l', 'o'}

Notes

  • Each character becomes a set element
  • Useful for character analysis

Create set from tuple or other iterable

set tuple generator iterable data-structures

Create a set from any iterable (tuple, generator, etc.)

tuple_data = (1, 2, 3, 2)
unique_tuple = set(tuple_data)
print(unique_tuple)  # {1, 2, 3}

# From generator
unique_gen = set(x for x in range(5))
print(unique_gen)  # {0, 1, 2, 3, 4}

Notes

  • Works with any iterable (list, tuple, string, generator)
  • Fast and memory efficient

Complex

Create set with comprehension

set comprehension condition data-structures

Create sets using set comprehensions

# Set comprehension for squares of numbers
squares = {x * x for x in range(6)}
print(squares)  # {0, 1, 4, 9, 16, 25}

# Set comprehension with condition
even_squares = {x * x for x in range(10) if x % 2 == 0}
print(even_squares)  # {0, 4, 16, 36, 64}

Notes

  • Set comprehensions are concise and expressive
  • Can include conditions for filtering
  • Similar to list comprehensions

Immutable sets (frozenset)

set frozenset immutable hashable data-structures

Create immutable sets with frozenset

# Create an immutable set
immutable = frozenset([1, 2, 3, 2])
print(immutable)  # frozenset({1, 2, 3})

# frozenset can be used as a dictionary key
my_dict = {frozenset([1, 2]): "value"}
print(my_dict)

Notes

  • frozenset is immutable and hashable
  • Useful as dictionary keys or set elements
  • Cannot add or remove elements after creation

🔗 Cross Reference

🏷️ Tags

set, create, unique, frozenset, comprehension, data-structures

📝 Notes

  • Use set() to remove duplicates from any iterable
  • Use set comprehensions for custom logic
  • Use frozenset for immutable sets