Appending Result In List Or Array Python3

I am using python-3.x and I have tow loops first one which is number of runs (3 times) the second one to generate solutions (2 times) what I want to do is: Collect the best solutio

Solution 1:

better work on nested list like [[1st best answer,1st best answer],[..,..]...] so you should define an other list in the second run . then append it to the result list . here's the modified code:

for i in range (run):
    lower = 300upper  = 500
    number_of_solutions = 50
    generate_solutions = 2 
    ####sub list 
    first_solution = []
    second_solution = []
    for ii in range (generate_solutions):     
        list_of_solutions = np.random.uniform(lower, upper, 
        number_of_solutions)
        #### append to the sub_list
        if ii == 1 :
            first_solution.append(min(list_of_solutions))
        if ii == 2 : 
            second_solution.append(min(list_of_solutions))
        lower = lower - 30.4323434upper  = upper - 90.634555
    del (number_of_solutions)
    del (lower)
#### append the sub_list to best_solutions after closing the loop
best_solution.append(fisrt_solution)
best_solution.append(second_solution)

Solution 2:

to make it more clear....

if the (i) = 0 if the (ii) = 0 the min(solution) from this loop will be stored in best_solutions in the index 0 if the (ii) = 1 the min(solution) from this loop will be stored in best_solutions in the index 1 if the (ii) = 2 the min(solution) from this loop will be stored in best_solutions in the index 2 and so on......

second run: if the (i) = 1 if the (ii) = 0 the min(solution) from this loop will be stored in best_solutions in the index 0 if the (ii) = 1 the min(solution) from this loop will be stored in best_solutions in the index 1 if the (ii) = 2 the min(solution) from this loop will be stored in best_solutions in the index 2 and so on......

I hope this will clarify what I want to do!!

I tried to store them by index but it gives me an error:

for i in range (run):
lower = 300upper  = 500
number_of_solutions = 50
generate_solutions = 2 
####sub list 
solution = []
for ii in range (generate_solutions):     
    list_of_solutions = np.random.uniform(lower, upper, number_of_solutions)
#### append to the sub_list
    solution.append(min(list_of_solutions))
    lower = lower - 30.4323434upper  = upper - 90.634555
#### append the sub_list to best_solutions
best_solutions[ii].append(solution[ii]) ############ here I tried to store them by index
del (number_of_solutions)
del (lower)

IndexError: list index out of range !!!????

Solution 3:

Finally, I find the best way to solve my problem, this the final code that I wrote:

import random
import numpy as np

run = 3
best_solutions = [np.empty(0)]
best_sol_sorted = []
del best_solutions[0]
final_result = [np.empty(0)]
del final_result[0]

for i inrange (run):
    lower = 300
    upper  = 500
    number_of_solutions = 50
    generate_solutions = 5####sub list 
    solution = []

    for ii inrange (generate_solutions):     
        list_of_solutions = np.random.uniform(lower, upper, number_of_solutions)

    #### append to the sub_list
        solution.append(min(list_of_solutions))
        lower = lower - 30.4323434
        upper  = upper - 90.634555
    best_solutions.append(solution)


for i inrange(generate_solutions):
    for ii inrange (run):
        best_sol_sorted.append(best_solutions[ii][i])
    final_result.append(best_sol_sorted)
    best_sol_sorted = []

where the last loop will do the job :) thanks for every one for giving ideas and advises