Index out of range error Python greedy method
Question: Hello I am currently getting an index out of range error from the following
code: (I will post the code first and then the error)

# Main File:

    
    
    import Knapsack_Test
    
    size = 10
    W = 2*size
    knapsack = Knapsack_Test.Knapsack_Test()
    
    for i in range(1, 10):   
    
        knapsack.greedy_knapsack_test(size, W)  
    
        size = size + 10*i
        W = 2*size
    

# Class File (Only the greedy function):

    
    
    def greedy_knap(self, v, w, W):
    
        knap_array = []
    
        for i in range(1, len(v)):
            #The index out of range error occurs here:
            knap_array[i] = [v[i],w[i]] 
    
        sort_order = self.sort.merge_sort(knap_array)
    
        weight = 0
        value = 0
    
        knap_sac= []
    
        n = len(knap_array)
        j = 0
        profit = 0
        while weight < W and j < n:
    
            if weight + knap_array[i][1] <= W:
    
                knap_sac.append(knap_array[i])
                weight = weight + knap_array[i][1]
                profit = profit + knap_array[i][0]
    
            j = j + 1
    
        return profit
    

# The test File (for greedy function):

    
    
    def greedy_knapsack_test(self, size, W):
        v = []
        w = []
        for i in range(1,size):
            v.append(random.randint(1,1000))
        for i in range(1,size):
            w.append(random.randint(1,1000))
        start = time.time()
        self.knapsack.greedy_knap(v, w, W)
        end = time.time() - start
        return end
    

# The Error:

    
    
    Traceback (most recent call last):
      File "\\minerfiles.mst.edu\dfs\users\asadmb\Desktop\Programming 3\Knapsack_Main.py", line 10, in <module>
        knapsack.greedy_knapsack_test(size, W)
      File "\\minerfiles.mst.edu\dfs\users\asadmb\Desktop\Programming 3\Knapsack_Test.py", line 31, in greedy_knapsack_test
        self.knapsack.greedy_knap(v, w, W)
      File "\\minerfiles.mst.edu\dfs\users\asadmb\Desktop\Programming 3\KnapsackClass.py", line 30, in greedy_knap
        knap_array[i] = [v[i],w[i]]
    IndexError: list assignment index out of range
    


Answer: 
    knap_array = []
    
    for i in range(1, len(v)): #The index out of range error occurs here:
        knap_array.append([v[i],w[i]])
    

you can't create list element by referencing them.

