input: Write a python function to generate a calendar for a given year and month.
  assert generate_calendar(2023, 10) == calendar.month(2023, 10)
  assert generate_calendar(2022, 2) == calendar.month(2022, 2)
  assert generate_calendar(2021, 12) == calendar.month(2021, 12)
output: import calendar
  
  def generate_calendar(year, month):
      return calendar.month(year, month)