Conditional access of array elements

Question

I have a data vector data = [x for x in range(0,999)] what I want to do is that to, access elements in data according to a given value e.g if value=10 access 0th index of data and if value=20 access 1st index of data. It is supoused to be something like this:

def get_data(value):
if value ==10:
    return data[0]
elif value == 20:
    return data[1]
elif value ==30:
    return data[2]

But in reality, i will have really big data and I cannot keep putting elif statements. Is there any efficient way of doing this?

You can check [there](https://stackoverflow.com/questions/60208/replacements-for-switch-statement-in-python), may help you.. :) — AntoineLB, May 14 '18 at 09:49

score 1 · Accepted Answer · answered May 14 '18 at 09:47

1

One approach could be dividing the value to 10 and then just substract 1 from result.

return data[value//10 - 1]

answered May 14 '18 at 09:47

Mihai Alexandru-Ionut

47,092
13
101
128

score 1 · Answer 2 · answered May 14 '18 at 10:07

1

You can use a dictionary to solve your problem.

def get_data(value):
     return {
         10: data[0],
         20: data[1],
         30: data[2]
     }.get(value, data[3])   #data[3] will be the default value.

answered May 14 '18 at 10:07

Amardeep Anand

19
1
6

But my array [10,20,30,.....] is really large. it is not possible to assign each value to dictionary manually – Salman Shaukat May 14 '18 at 10:12

Conditional access of array elements

2 Answers2