Well ... depends what you mean by "improvement":
1) Readability
2) Maintenance
3) Speed
4) Memory usage
5) User Interface
6) Enhancements
They are all "improvements" of one form or another, and it's not possible to be specific without knowing the criteria on which the app would be judged.
I would say that the commenting is ... very poor - you are documenting what teh code does instead of why it does it, or even inaccurate:
if len(find):
sum = sum + find[0]['price']
print ("\nAdd More Dishes OR Press E for Bill! ")
else:
print("\nEnter Right Item\n")
The variable names are poor: "getdishes" for example.
From a user point of view it's pretty nasty - would you want to use it for real, all day, every day?
But as I said: we have no idea what the context of this is - other than "it's your homework" so "improving" it is beyond our bailiwick.