Python - Ways to create triplets from given list

A triplet is a group of three consecutive elements from a list. Creating triplets from a given list means extracting all possible combinations of three adjacent elements. Python provides several approaches to accomplish this task efficiently.

Using List Comprehension

List comprehension provides a concise way to create triplets by slicing the list ?

# List of words
words = ['I', 'am', 'Vishesh', 'and', 'I', 'like', 'Python', 'programming']

# Using list comprehension to create triplets
triplets = [words[i:i + 3] for i in range(len(words) - 2)]

print("Triplets using list comprehension:")
print(triplets)

Triplets using list comprehension:
[['I', 'am', 'Vishesh'], ['am', 'Vishesh', 'and'], ['Vishesh', 'and', 'I'], ['and', 'I', 'like'], ['I', 'like', 'Python'], ['like', 'Python', 'programming']]

Using For Loop with Slicing

A traditional approach using a for loop to iterate and slice the list ?

# List of words
words = ['I', 'am', 'Vishesh', 'and', 'I', 'like', 'Python', 'programming']

# Using for loop with slicing
triplets = []
for i in range(len(words) - 2):
    triplets.append(words[i:i + 3])

print("Triplets using for loop with slicing:")
print(triplets)

Triplets using for loop with slicing:
[['I', 'am', 'Vishesh'], ['am', 'Vishesh', 'and'], ['Vishesh', 'and', 'I'], ['and', 'I', 'like'], ['I', 'like', 'Python'], ['like', 'Python', 'programming']]

Using For Loop with Individual Elements

Manually creating each triplet by accessing individual elements ?

# List of words
words = ['I', 'am', 'Vishesh', 'and', 'I', 'like', 'Python', 'programming']

# Using for loop with individual elements
triplets = []
for i in range(len(words) - 2):
    temp = []
    temp.append(words[i])
    temp.append(words[i + 1])
    temp.append(words[i + 2])
    triplets.append(temp)

print("Triplets using individual elements:")
print(triplets)

Triplets using individual elements:
[['I', 'am', 'Vishesh'], ['am', 'Vishesh', 'and'], ['Vishesh', 'and', 'I'], ['and', 'I', 'like'], ['I', 'like', 'Python'], ['like', 'Python', 'programming']]

Using zip() Function

The zip() function can combine three shifted versions of the same list ?

# List of words
words = ['I', 'am', 'Vishesh', 'and', 'I', 'like', 'Python', 'programming']

# Using zip function
triplets = list(zip(words, words[1:], words[2:]))

print("Triplets using zip function:")
print([list(triplet) for triplet in triplets])

Triplets using zip function:
[['I', 'am', 'Vishesh'], ['am', 'Vishesh', 'and'], ['Vishesh', 'and', 'I'], ['and', 'I', 'like'], ['I', 'like', 'Python'], ['like', 'Python', 'programming']]

Comparison

Conclusion

List comprehension and zip() function are the most efficient methods for creating triplets. Use list comprehension for readable code and zip() for optimal performance in functional programming style.