the first statement is the correct one if is any value between and then the statement will be true the idea is that has to be both greater than and less than on the other handthe second statement is not what we want because for it to be trueeither has to be greater than or has to be less than but every number satisfies this the lesson here is if your program is not working correctlycheck your and' and or' mistake another very common mistake is to write something like belowif grade>= and < this will lead to syntax error we have to be explicit the correct statement is if grade>= and grade< on the other handthere is nice shortcut that does work in python (though not in many other programming languages)if <=grade< elif simple use of an if statement is to assign letter grades suppose that scores and above are 'sscores in the are ' are ' are 'sand anything below is an here is one way to do thisgrade eval(input'enter your score')if grade>= print' 'if grade>= and grade< print' 'if grade>= and grade< print' 'if grade>= and grade< print' 'if grade< print' 'the code above is pretty straightforward and it works howevera more elegant way to do it is shown below grade eval(input'enter your score')if grade>= print' 'elif grade>= print' 'elif grade>= print' '