One-liner to check whether an iterator yields at least one element in python?

One-liner to check whether an iterator yields at least one element in python?

You can use Python's built-in any() function to check if an iterator yields at least one element. Here's a one-liner to do that:

iterator_has_elements = any(True for _ in your_iterator)

Replace your_iterator with the actual iterator you want to check. This expression uses a generator expression within any() to create a sequence of True values for each element yielded by the iterator. If the iterator has at least one element, any() will return True; otherwise, it will return False.

For example:

# Check if a list has at least one element my_list = [1, 2, 3] has_elements = any(True for _ in my_list) print(has_elements) # Output: True # Check if an empty list has at least one element empty_list = [] has_elements = any(True for _ in empty_list) print(has_elements) # Output: False

This one-liner provides a concise way to check for the presence of elements in an iterator.

Examples

  1. "Python one-liner check if iterator has elements" Description: Users often seek a concise way to check if an iterator yields at least one element. Below is a one-liner solution using the any() function.

    iterator_has_elements = any(iterator)

  2. "Python one-liner test if iterator not empty" Description: Users might search for a compact method to test if an iterator is not empty. The following one-liner accomplishes this using the bool() constructor with the next() function.

    iterator_not_empty = bool(next(iter(iterator), False))

  3. "Python one-liner check if iterator has items" Description: Users frequently look for concise ways to determine if an iterator contains items. Below is a one-liner approach leveraging the next() function with a default value.

    iterator_has_items = next(iter(iterator), None) is not None

  4. "Python one-liner check if iterator is not null" Description: Users may want to quickly check if an iterator is not null or empty. Here's a one-liner utilizing the next() function with a default value.

    iterator_not_null = next(iter(iterator), object()) is not object()

  5. "Python one-liner test if iterator has content" Description: Users might search for concise ways to verify if an iterator has content. The following one-liner checks if the iterator has any elements using the bool() constructor with next().

    iterator_has_content = bool(next(iter(iterator), None))

  6. "Python one-liner check if iterator has values" Description: Users often look for succinct methods to check if an iterator contains values. Below is a one-liner approach utilizing any() with a generator expression.

    iterator_has_values = any(True for _ in iterator)

  7. "Python one-liner verify iterator not empty" Description: Users may want a concise way to verify that an iterator is not empty. This one-liner checks if the iterator has elements using bool() with next().

    iterator_not_empty = bool(next(iter(iterator), None))

  8. "Python one-liner check if iterator has data" Description: Users often seek a compact solution to check if an iterator contains data. The following one-liner employs the any() function with a comprehension.

    iterator_has_data = any(True for _ in iterator)

  9. "Python one-liner test if iterator has entries" Description: Users may search for a concise way to test if an iterator has entries. Below is a one-liner approach utilizing the next() function with a default value.

    iterator_has_entries = next(iter(iterator), object()) is not object()

  10. "Python one-liner check if iterator has elements present" Description: Users might look for a succinct method to check if an iterator has elements present. Below is a one-liner using the any() function.

    iterator_has_elements = any(True for _ in iterator)

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