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Python Programming - Generators - Discussion

Discussion Forum : Generators - General Questions (Q.No. 67)
Generators
67.
How does the itertools.islice() function differ from itertools.takewhile() when used with generators?
They are equivalent in functionality
itertools.islice() allows for arbitrary slicing, while itertools.takewhile() stops based on a condition
itertools.takewhile() allows for arbitrary slicing, while itertools.islice() stops based on a condition
itertools.islice() modifies the original generator, while itertools.takewhile() creates a new generator
Answer: Option
Explanation:
itertools.islice() allows for arbitrary slicing by specifying start, stop, and step parameters, while itertools.takewhile() stops yielding elements when a specified condition becomes false. 
import itertools

def my_generator():
    for i in range(10):
        yield i

sliced_iterable = itertools.islice(my_generator(), 2, 7)
takewhile_iterable = itertools.takewhile(lambda x: x < 5, my_generator())

print(list(sliced_iterable))      # Output: [2, 3, 4, 5, 6]
print(list(takewhile_iterable))   # Output: [0, 1, 2, 3, 4]
Discussion:
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