text: """A command line interface for a calculator app."""
  import click
  
  from app.calculator import (
      CalculatorTypeError,
      CalculatorValueError,
      difference as d,
      power as po,
      product as pr,
      quotient as q,
      sum_ as s,
  )
  
  
  def _exception_handler(op, *args):
      """Handle internally raised exceptions and print to console.
  
      Args:
          op (func): The function to perform
          *args: The function's arguments
  
      Returns:
          The function's computational result
  
      """
      try:
          return op(*args)
      except (CalculatorTypeError, CalculatorValueError) as e:
          click.echo(e)
  
  
  @click.group()
  def simplecalc():  # pragma: no cover
      """Compute simple calculations."""
      pass
  
  
  @simplecalc.command()
  @click.argument("numbers", nargs=-1)
  def sum(numbers):
      """Find the sum of a list of numbers."""
      click.echo(_exception_handler(s, numbers))
  
  
  @simplecalc.command()
  @click.argument("numbers", nargs=-1)
  def difference(numbers):
      """Find the difference of a list of numbers."""
      click.echo(_exception_handler(d, numbers))
  
  
  @simplecalc.command()
  @click.argument("numbers", nargs=-1)
  def product(numbers):
      """Find the product of a list of numbers."""
      click.echo(_exception_handler(pr, numbers))
  
  
  @simplecalc.command()
  @click.argument("numbers", nargs=-1)
  def quotient(numbers):
      """Find the quotient of a list of numbers."""
      click.echo(_exception_handler(q, numbers))
  
  
  @simplecalc.command()
  @click.argument("numbers", nargs=-1)
  def power(numbers):
      """Find the power of a list of numbers."""
      click.echo(_exception_handler(po, numbers))
  
  
  if __name__ == "__main__":
      simplecalc()
  