input: Write a python function to print the current month's calendar using the `calendar` and `datetime` modules.
  assert isinstance(print_current_month_calendar(), str)
  assert 'Mo Tu We Th Fr Sa Su' in print_current_month_calendar()
  assert str(today.month) in print_current_month_calendar()
output: def print_current_month_calendar():
      import calendar
      from datetime import datetime
  
      today = datetime.today()
      year = today.year
      month = today.month
  
      cal = calendar.TextCalendar(calendar.MONDAY)
      return cal.formatmonth(year, month)