# float(), round()
print("Example: float, round")
Pi_str = "3.14159"
print("the value of pi is "+Pi_str + " which we have put in a string - Python has no clue it is a number.") #proves Pi_str is a string or print would bomb
Pi_num = float(Pi_str) #make our Pi string into a decimal number
print("Pi_num is assigned float(Pi_str) so we can use it as a number")
print("Lets round it to 3 decimal points using the round(number [,digits]) command")
print("now the value held by Pi_num is:")
Pi_num = round(Pi_num, 3)
print(Pi_num)