How to check a string and invert true to false and false to true. /u/Silent_Profit_4098 Python Education

so to explain im working on a code for school and i want to have my code check if the string doesn’t match i want it to output true if there isnt any of the checked text but no matter what i do it runs a error. Please help me this is due tomorrow and im so confused. i cant post images so i will paste my code below.

#I want the code below to check if my variable (sandwich) has the preset text in it and if the text does not match i want it to output true instead of false.

#I want this to set true if this is false but i cant figure out how to get my NOT statment working.

elif Sandwich not == “chicken” or “beef” or “tofu”:

print (“you have choosen an invalid choice please try again”)

quit(“invalid”)

the error i keep getting is invalid syntax at my == section

so to explain im working on a code for school and i want to have my code check if the string doesn’t match i want it to output true if there isnt any of the checked text but no matter what i do it runs a error. Please help me this is due tomorrow and im so confused. i cant post images so i will paste my code below.

#I want the code below to check if my variable (sandwich) has the preset text in it and if the text does not match i want it to output true instead of false.

#I want this to set true if this is false but i cant figure out how to get my NOT statment working.

elif Sandwich not == “chicken” or “beef” or “tofu”:

print (“you have choosen an invalid choice please try again”)

quit(“invalid”)

the error i keep getting is invalid syntax at my == section