human
Solve in Python:
Given an array of integers with possible duplicates, randomly output the index of a given target number. You can assume that the given target number must exist in the array.

Note:
The array size can be very large. Solution that uses too much extra space will not pass the judge.

Example:

int[] nums = new int[] {1,2,3,3,3};
Solution solution = new Solution(nums);

// pick(3) should return either index 2, 3, or 4 randomly. Each index should have equal probability of returning.
solution.pick(3);

// pick(1) should return 0. Since in the array only nums[0] is equal to 1.
solution.pick(1);
assistant
#Here is the Python code you requested.

class Solution:
 
     def __init__(self, nums):
         """
         :type nums: List[int]
         """
         self.nums = nums;
         
         
 
     def pick(self, target):
         """
         :type target: int
         :rtype: int
         """
         indices = [i for i, x in enumerate(self.nums) if x == target]
         return random.choice(indices)
 
 
 # Your Solution object will be instantiated and called as such:
 # obj = Solution(nums)
 # param_1 = obj.pick(target)