RAM problem in script execution

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Hi experts!

I wrote the next code. In 1-2 hours of execution time the RAM of my laptop (8gb) is filled and the sistem crash:

from scipy.stats import uniform    
import numpy as np

cant_de_cadenas=[400,600,700,800]
os.makedirs('directory')
np.savetxt(here 'cant_de_cadenas' is saved as .csv in folder 'directory')

A1=mp.array([])
...
A6=mp.array([])
import time

for N in cant_de_cadenas:
    start=time.clock()
    B1=mp.array([])
    ...
    B6=mp.array([])

    for u in srange (100):
        array_1 = uniform.rvs(loc=-2,scale=4, size=N)
        array_2 = uniform.rvs(loc=-2,scale=4, size=N)
        array_3 = uniform.rvs(loc=-1,scale=7, size=N)
        array_4 = 1/np.tan(array_3)
        array_5 = uniform.rvs(loc=-1,scale=1, size=N)
        array_6 = function(array_5)
        array_7 = function(array_6, array_5 and array_4)
        array_8 = function(array_1 and array_7)
        array_9 = function(array_2 and array_7)

        M=np.zeros([N+4,N+4])

        for j in srange(N+4):
            if j>0:
                two arrays (C and D) with len=j-1 are created

                for k in srange (j):
                    if C[k]<=0 and D[k]<=0:
                        M[j,k]=1

            if j+1<N+4:
                two arrays (C and D) with len=((N+4)-j-1) are created

                for k in srange ((N+4)-j-1):
                    if C[k]<=0 and D[k]<=0:
                        M[j,k+j+1]=1

        An algorithm with matrix M is executed and values 'b1' and 'b2' are generated

        M_hor=M.copy()
        Some values in M_hor are changed and an algorithm with matrix M_hor is executed and values 'b3' and 'b4' are generated

        M_ver=M.copy()
        Some values in M_hor are changed and an algorithm with matrix M_hor is executed and values 'b5' and 'b6' are generated

        B1=np.append(B1,b1)
        ...
        B6=np.append(B6,b6)

    A1=np.append(A1,sum(B1)/100)
    ...
    A6=np.append(A6,sum(B6)/100)

Like you can see, len(A1)=...=len(A6)=len( cant_de_cadenas) (because in An are the average values of 100 repetitions -included in Bn-).

While many arrays are created (array_1,array_2 etc , with lenght N), in each one of the 100 cycles 'for u in srange (100)' these arrays are overwritten (with the same name). The same applies to B1,...,B6 arrays: in each one of the len(cant_de_cadenas) cyles 'for N in srange (cant_de_cadenas)' these arrays are overwritten (with the same name).

I tryed with gc and gc.collect() and nothing work! In addition, i cant use memory_profiler module in sage.

What am I doing wrong? Why the memory becomes full while running (starts with 10% of RAM used and in 1-2hour is totally full used)?

Please help me, I'm totally stuck!

Thanks a lot!