Generating sequences with ellipsis in Python

Last update on April 23 2025 12:57:23 (UTC/GMT +8 hours)

7. Generator with Ellipsis Gap

Write a Python program to create a generator expression that generates a sequence of numbers with ellipsis representing skipped values.

Sample Solution:

Code:

def generate_sequence(start, end, step, skip_count):
    """
    Args:
        start (int): The starting value of the sequence.
        end (int): The ending value of the sequence.
        step (int): The step size between values.
        skip_count (int): The number of values to skip with ellipsis.

    Returns:
        A generator expression for the sequence.
    """
    for i in range(start, end, step):
        if skip_count > 0:
            yield i
            skip_count -= 1
        else:
            yield "..."
            skip_count = skip_count + step - 1

sequence_generator = generate_sequence(1, 30, 2, 4)

for item in sequence_generator:
    print(item, end=", ")

Output:

1, 3, 5, 7, ..., 11, ..., 15, ..., 19, ..., 23, ..., 27, ...,

In the exercise above, the "generate_sequence()" function takes parameters for the starting value ('start'), ending value ('end'), step size ('step'), and the number of values to skip with 'ellipsis' (skip_count). It uses a generator expression to yield values from 'start' to 'end' with the specified step size. When it reaches 'skip_count', it yields 'ellipsis (...)' to represent skipped values.

Flowchart:

For more Practice: Solve these Related Problems:

Write a Python program to create a generator expression that yields numbers from 1 to 20, but yields Ellipsis between 10 and 15 to indicate a gap.
Write a Python function that returns a generator yielding the first 5 numbers, then an Ellipsis, followed by the last 5 numbers from a specified range.
Write a Python script to build a generator expression that outputs a sequence with Ellipsis inserted if the gap between successive numbers exceeds 1.
Write a Python program to implement a generator that yields numbers from a range and yields Ellipsis when the current number is divisible by a specific value.

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Next: Extending sequences with ellipsis in Python.

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