input: Write a function that returns the current month's calendar. The function should return a formatted string of the calendar for the current month. 
  
  from calendar import TextCalendar
  from datetime import datetime
  
  def get_current_month_calendar():
      now = datetime.now()
      cal = TextCalendar().formatmonth(now.year, now.month)
      return cal
  
  calendar = get_current_month_calendar()
  assert calendar != None
  assert '\n' in calendar
  print(calendar)
output: def get_current_month_calendar():
      now = datetime.now()
      cal = TextCalendar().formatmonth(now.year, now.month)
      return cal