Creating a List of Sets in Python
Last Updated :
27 Dec, 2024
Creating a list of sets in Python involves storing multiple sets within list structure. Each set can contain unique elements and the list can hold as many sets as needed. In this article, we will see how to create a list of set using different methods in Python.
Using List Comprehension
List comprehension creates a list of sets faster than loops by avoiding extra operations. It generates sets with consecutive integers using a compact syntax and the specified range.
Example:
Python
# Create a list of sets, each containing 3 consecutive numbers
a = [set(range(i, i + 3)) for i in range(0, 10, 3)]
print(a) # Set list
Output[{0, 1, 2}, {3, 4, 5}, {8, 6, 7}, {9, 10, 11}]
Explanation:
- This creates a list of sets with three consecutive integers each.
- It iterates from 0 to 9 with a step of 3, forming sets .
Using map()
map()function is used to apply a specific function to each element of an iterable. It is efficient for transforming or processing data into sets, especially for large datasets.
Example:
Python
# Create a list of ranges, each containing 3 consecutive numbers
a = [range(i, i + 3) for i in range(0, 10, 3)]
# Convert each range in the list to a set using map
res = list(map(set, a))
print(res)
Output[{0, 1, 2}, {3, 4, 5}, {8, 6, 7}, {9, 10, 11}]
Explanation:
- Creates a list of ranges with three consecutive integers.
- Converts each range in
a to set. - Prints the list of sets.
Using For loop
For loop manually creates and appends sets to list, allowing for additional logic during set creation. It is slightly less efficient due to intermediate operations like append().
Example:
Python
# Initialize an empty list to store sets
a = []
# Loop through numbers from 0 to 9 with a step of 3
for i in range(0, 10, 3):
# Create a set containing three consecutive numbers starting from 'i'
b = set(range(i, i + 3))
# Append the set to the list 'a'
a.append(b)
print(a)
Output[{0, 1, 2}, {3, 4, 5}, {8, 6, 7}, {9, 10, 11}]
Explanation:
- Initializes an empty list for sets.
- Loops through range with steps of 3.
- Creates and appends set of three integers to
a.
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