列表分配索引超出范围

Question

My code is giving me the error of:

    list_subs[n][4] = np.random.normal(list_subs[n][1], list_subs[n][2])
IndexError: list assignment index out of range.

I have searched for this error and i still can't find what is the problem.

Edit: Full Traceback

Traceback (most recent call last): File "", line 420, in run_nodebug File "C:\\Documents and Settings\\jhsilva\\Desktop\\Monte carlo\\Teste.py", line 71, in generateRandomNumbers(list_subs) File "C:\\Documents and Settings\\jhsilva\\Desktop\\Monte carlo\\Teste.py", line 41, in generateRandomNumbers list_subs[n][4] = np.random.normal(list_subs[n][1], list_subs[n][2]) IndexError: list assignment index out of range

The Code

def generateRandomNumbers(list_subs):

    for n in range(len(list_subs)):

        string = list_subs[n][3]
        string = string.lower()

        if(string == "normal"):
            list_subs[n][4] = np.random.normal(list_subs[n][1], list_subs[n][2])
            print("Numero gerado:",list_subs[n][4])


variables = [v for v in variables if v not in special]


list_subs=[[0 for col in range(6)] for row in range(len(variables)-1)]

#This prints fine
print(len(list_subs))

#this prints fine too
print(list_subs[0][4])

for n in range(len(variables)):
    if n>0:
        (media,desviopadrao,distribuicao) = eval(input("For variable "+variables[n]+" input: median, std, distr \n"))
        list_subs[n-1] = [variables[n], media, desviopadrao, distribuicao]

N = eval(input("Qual o numero de iteracoes que deseja:"))

Var = []
for n in range(N):
    generateRandomNumbers(list_subs)
    Var.append(calcEq(formula))

Answer 1

list_subs[n-1] = [variables[n], media, desviopadrao, distribuicao]

You are setting list_subs to be a list of lists of length 4 . This means that the valid indeces are 0, 1, 2, 3 . In generateRandomNumbers you access index 4 , which is invalid.

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Security note: Don't use eval(input(...)) . If you want to parse numbers/tuples etc simply use ast.literal_eval , which is a safe alternative.