using and vs or in statments-CodePudding

while gender.capitalize() != "M" and gender.capitalize() != "F" and gender.capitalize() != "Male" and gender.capitalize() != "Female":
    print("Not a valid entry: ")
    gender = (input("Gender: "))
if gender.capitalize() == "M" or gender.capitalize()== "Male":
    print("Hello "   name   " you are "   age   " years old and are a boy")
elif gender.capitalize() == "F" or gender.capitalize()== "Female":
    print("Hello "   name   " you are "   age   " years old and are a girl")

this is working code I would just like to know why and works above and or works below im sure it's the != but I'm not sure

I just want a better understanding of when and why to use and vs or

CodePudding user response：

and should be used when all the conditions requirement shoule be met [i.e all conditions must be True]

or should be used when any one condition satisfy the condition [i.e. any one condition should met True]

Ex let's say you wanted a number which should be divisible by 2 and should be greater than 10

Condition you should apply -: if num%2==0 and num>10: as you see and is used because you wanted both criteria to be satisfied

Ex let's say you wanted a number which is greater than 10 or if it is not greater than 10 the number should divisible by 2

Condition you should apply :- if num>10 or num%2==0 as you see or used because any one criteria if satisfied you wanted that number..

CodePudding user response：

In the top line (while) you are asking that the gender variable is non of the values you mention so not (!=) M, F, Male nor Female.

For the bottom two lines either one can be used so for the middle line (if) the value could either be M OR Male.

To conclude if you use AND all the conditions have to be true if you use OR only one of the given conditions have to be true.

Example: True AND False -> Returns FALSE True OR False -> Returns FALSE