input: from typing import List, Tuple
  
  def generate_sample_data(num_entries: int) -> List[Tuple[str, str, int]]:
      """ Generate sample data for a web application using Python's faker library. 
      The output should contain three columns of data: name, email, and age.
      >>> generate_sample_data(2)
      [('John Doe', 'john.doe@example.com', 35), ('Jane Smith', 'jane.smith@example.com', 28)]
      """
      from faker import Faker
      fake = Faker()
      return [(fake.name(), fake.email(), fake.random_int(min=18, max=60)) for _ in range(num_entries)]
output:     from faker import Faker
      fake = Faker()
      return [(fake.name(), fake.email(), fake.random_int(min=18, max=60)) for _ in range(num_entries)]