I'm wondering whether it is possible to select a variable based on a certain condition/input.
For example:
day_1 = 5
day_2 = 10
day_3 = 15
i =2
selected_variable = day_i
The code would give an error that of course day_i is not defined. I know I could add all variables to a list and access them through list locations etc but I'm working with a rather big Simpy environment in which this would be very useful if it exists.
Thanks!
You can use vars() to get all varables in the scope.
for exsample:
day_1 = 5
day_2 = 10
day_3 = 15
i = 2
selected_variable = vars()[f"day_{i}"]
You can stores the values in a list, and use i as an index to access one box, you do i-1 because list are indexed from 0
days = [5, 10, 15]
i = 2
selected_variable = days[i - 1]
You can also associated key/value in a dictionary, and from a number get the value
days = {
1: 5, 2: 10, 3: 15
}
i = 2
selected_variable = days[i]
As mentioned in comments there are couple of sulutions:
You can define a dict:
day = {
"day_1": 5,
"day_2": = 10,
"day_3": = 15
}
selected_variable = day[f"day_{i}"]
An array
day = [
5,
10,
15
]
selected_variable = day[i]
An If statement
day_1 = 5
day_2 = 10
day_3 = 15
if i == 1:
selected_variable = day_1
elif i == 2:
selected_variable = day_2
elif i == 3:
selected_variable = day_3
Or the locals (or vars) dict (my favorite in this case)
day_1 = 5
day_2 = 10
day_3 = 15
selected_variable = locals()[f"day_{i}"]
The below code will print out the value of the variable day_2
i =2
selected_variable = 'day_{}'.format(str(i))
exec("print(%s)" % selected_variable)
