text: PI = 3.1415926 # longer values of PI are available from libraries
  print(PI)
  e = 2.71 # could use this perhaps
  print(e)
  # for floats we use . 
  my_not_float = 2,56223 # this will not work properly
  # it will create a tuple
  
  this_is_float = 2.46345
  # type casting - changing one data type to another
  my_int = int(this_is_float)
  print(my_int, this_is_float)
  
  float_again = float(my_int)
  print(my_int, float_again)
  
  print(0.1+0.2)
  result = 0.1+0.2-0.3 # this will not be quite zero
  print(result)
  rounded_result = round(result)
  print(rounded_result)
  print(PI, round(PI,4))
  
  
  