Python how to put function or method in array while only being called once referenced-CodePudding

If i have this tuple:

tuple = (a   1,'hello','hello2',etc...)

and at the start of the program, variable a is 1, while being 2 later on, tuple[0] sould return 2 at the start, and 3 at the end. how do i go about doing this?

should i make it 'a 1' and use eval()? don't ask "why i would need this" or "why am i doing it this way" because we all know the 'uninformative people on stackoverflow' memes, and i genuinely need to know.

CodePudding user response：

Use a function.

a = 1
my_tuple = (lambda x: x   1, "hello")
a = my_tuple[0](a)
print(a) # prints 2
a = my_tuple[0](a)
print(a) # prints 3

CodePudding user response：

To compliment what @Barmar has posted you could do something like the following using eval.

a = 1
my_tuple = (lambda: eval('a   1'), "hello")
print(my_tuple[0]()) # prints 2
a = 2
print(my_tuple[0]()) # prints 3